Removed Si7021 and added HYT221 humidity sensor

Si7021 wrap around bug now has a partial workaround
2024-05-02 11:04:41 +02:00 · 2024-03-13 11:37:44 +01:00 · 2024-03-13 11:35:45 +01:00 · 2024-03-11 12:58:36 +01:00 · 2024-02-28 16:30:15 +01:00 · 2024-01-22 18:17:09 +01:00
38 changed files with 36749 additions and 2081 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -26,3 +26,72 @@ All notable changes to this project will be documented in this file.
 ### Changed

 - Heater of humidiy sensor only on when humidity is above 96% (was 80%). When heater is on temperature sensor also heats up, so use temperature sensor of BMP280 when heater is on.
+
+## [0.2.1] - 2024-01-17
+
+### Changed
+
+- Heater algorithm updated. Idea from datasheet of humidity sensor from Temco Controls HUM-M2 humidity sensor module.
+- ModBus read register 1: Scaled wind direction by 10 in order to also get the decimal position of the direction
+
+### Added
+
+- ModBus read register 12: Raw rain meter
+- ModBus read register 13: Temperature from pressure sensor
+- ModBus read register 14: Status bits
+- ModBus coil register 0 : enable/disable heather algorithm
+
+## [0.2.2] - 2024-01-21
+
+### Fixed
+
+- Buffer overflow when calculating average wind speed in AverageOfArray(). Fix: use 32 bit register for average_value.
+
+### Changed
+
+- Changed some variables to the propper standard (uint8_t, uint16_t, etc.)
+- SparkFun wind interrupt now calculates over 3 seconds in stead of 1 second (KNMI standard)]
+
+## [0.2.3] - 2024-02-28
+
+### Changed
+
+- Humidity often got stuck at 100%. Heater algorithm now heats for 10 minutes and cools down for 10 minutes (was 5min/15min)
+
+## [0.2.4] - 2024-03-08
+
+### Changed
+
+- Humidity timer back to 5/15 minutes: shorter cooling times give false temperature readings.
+
+### Fixed
+
+- Classic 0/1 error in max and average calculating routine, which resulted in a buffer overflow.
+
+## [0.2.5] - 2024-03-11
+
+### Fixed
+
+- 0/1 error in max and average (again, or better said: still!).
+
+### Changed
+
+- Humidity threshold heater is now a define instead of hard coded numbers in the source.
+
+## [0.2.6] - 2024-03-13
+
+### Fixed
+
+There is a bug in the Si7021 chip: when the sensor is exposed to extreme environmental conditions for a longer period (very high or very low humidity), the humidity register will wrap around and give wrong values. (https://community.silabs.com/s/question/0D51M00007xeOo9SAE/si7021-relative-humidity-reading-underflowing-?language=en_US).
+Workaround: let's assume the humidity will never go below 15%. In the Netherlands a humidity below 20% is rare, but can occur and the minimum value ever measured in De Bilt was 6% (on 1 april 1965). At several other sites in the Netherlands the humidity went as low as 10%. But as this was a one time event and the measurements are doubtful, this event was not registered in the original database. (https://nl.wikipedia.org/wiki/Relatieve_luchtvochtigheid)
+In rare cases, the humidity value could creep up above 15% (when the actual humidity is 100%) and still give wrong values.
+
+## [0.3.0] - 2024-05-02
+
+### Added
+
+Support for HYT-221 humidity sensor
+
+### Removed
+
+Support for si7021 humidity sensor (this sensor was not suited for outdoor measurments)
--- a/README.md
+++ b/README.md
@@ -8,8 +8,7 @@ A weather station build around a SparkFun Weather Meter Kit (SEN-15901). The tem

 ## Documentation

-An apprehensive description of the project can be found here: https://meezenest.nl/mees/projects/weather_station/weather_station.html
-
+An apprehensive description of the project can be found here: [https://meezenest.nl/mees/weather_station.html](https://meezenest.nl/mees/weather_station.html)
 ## Sensors

 - SparkFun SEN-15901 Weather Station (wind speed, wind direction and rain fall)
@@ -45,6 +44,12 @@ An apprehensive description of the project can be found here: https://meezenest.

 Libraries are included with the source code of this project

+## Known bugs
+
+There is a bug in the Si7021 chip: when the sensor is exposed to extreme environmental conditions for a longer period (very high or very low humidity), the humidity register will wrap around and give wrong values. (https://community.silabs.com/s/question/0D51M00007xeOo9SAE/si7021-relative-humidity-reading-underflowing-?language=en_US).
+Workaround: let's assume the humidity will never go below 15%. In the Netherlands a humidity below 20% is rare, but can occur and the minimum value ever measured in De Bilt was 6% (on 1 april 1965). At several other sites in the Netherlands the humidity went as low as 10%. But as this was a one time event and the measurements are doubtful, this event was not registered in the original database. (https://nl.wikipedia.org/wiki/Relatieve_luchtvochtigheid)
+In rare cases, the humidity value could creep up above 15% (when the actual humidity is 100%) and still give wrong values.
+
 ## License

 Copyright (C) 2023, 2024  M.T. Konstapel
--- a/TODO.md
+++ b/TODO.md
@@ -0,0 +1,12 @@
+# Todo list for weather station with ModBus over RS-485
+
+## Reset firmware via ModBus coil bit
+
+Soemtimes the weater station needs to be reset. For example if the I2C communication with the sensors is lost. The pressure sensor tends to have this probem occacionally.
+
+## Implement support for new humidity sensor
+
+Heater function of former sensor needs to be disabled as the new sensor does not have (or need) a heater.
+
+
+
--- a/article/Makefile
+++ b/article/Makefile
@@ -0,0 +1,9 @@
+html:
+	pandoc -s weather_station_article.md --toc --toc-depth=1 -c ./css/mvp.css \
+	--template ./template/template.html -o weather_station_article.html
+
+pdf:
+	pandoc weather_station_article.md --toc -o weather_station_article.pdf --pdf-engine=xelatex -H ./template/custom_settings.tex
+
+clean:
+	rm -rvf build
--- a/article/css/mvp.css
+++ b/article/css/mvp.css
@@ -0,0 +1,563 @@
+/* MVP.css v1.14 - https://github.com/andybrewer/mvp */
+/* Edited by Konstapel https://meezenest.nl/mees     */
+
+:root {
+    --active-brightness: 0.85;
+    --border-radius: 5px;
+    --box-shadow: 2px 2px 10px;
+    --color-accent: #f4f0ec;
+    --color-bg: #fff;
+    --color-bg-secondary: #e9e9e9;
+    --color-link: #a9a9a9;
+    --color-secondary: #3366FF;
+    --color-secondary-accent: #920de90b;
+    --color-shadow: #f4f4f4;
+    --color-table: #a9a9a9;
+    --color-text: #000;
+    --color-text-secondary: #999;
+    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
+    --hover-brightness: 1.2;
+    --justify-important: center;
+    --justify-normal: left;
+    --line-height: 1.5;
+    --width-card: 285px;
+    --width-card-medium: 460px;
+    --width-card-wide: 1080px;
+    --width-content: 1080px;
+}
+
+@media (prefers-color-scheme: dark) {
+    :root[color-mode="user"] {
+        --color-accent: #0097fc4f;
+        --color-bg: #333;
+        --color-bg-secondary: #555;
+        --color-link: #0097fc;
+        --color-secondary: #e20de9;
+        --color-secondary-accent: #e20de94f;
+        --color-shadow: #bbbbbb20;
+        --color-table: #0097fc;
+        --color-text: #f7f7f7;
+        --color-text-secondary: #aaa;
+    }
+}
+
+html {
+    scroll-behavior: smooth;
+}
+
+@media (prefers-reduced-motion: reduce) {
+    html {
+        scroll-behavior: auto;
+    }
+}
+
+/* Layout */
+article aside {
+    background: var(--color-secondary-accent);
+    border-left: 4px solid var(--color-secondary);
+    padding: 0.01rem 0.8rem;
+}
+
+body {
+    background: var(--color-bg);
+    color: var(--color-text);
+    font-family: var(--font-family);
+    line-height: var(--line-height);
+    margin: 0;
+    overflow-x: hidden;
+    padding: 0;
+    font-size: 110%;
+}
+
+footer,
+header,
+main {
+    margin: 0 auto;
+    max-width: var(--width-content);
+    padding: 3rem 1rem;
+}
+
+main {
+    border: 1px solid lightgray;
+    border-radius: 5px;
+}
+
+footer {
+    font-size: 0.7em;
+}
+
+hr {
+    background-color: var(--color-bg-secondary);
+    border: none;
+    height: 1px;
+    margin: 4rem 0;
+    width: 100%;
+}
+
+section {
+    display: flex;
+    flex-wrap: wrap;
+    justify-content: var(--justify-important);
+}
+
+section img,
+article img {
+    max-width: 100%;
+}
+
+section pre {
+    overflow: auto;
+}
+
+section aside {
+    border: 1px solid var(--color-bg-secondary);
+    border-radius: var(--border-radius);
+    box-shadow: var(--box-shadow) var(--color-shadow);
+    margin: 1rem;
+    padding: 1.25rem;
+    width: var(--width-card);
+}
+
+section aside:hover {
+    box-shadow: var(--box-shadow) var(--color-bg-secondary);
+}
+
+[hidden] {
+    display: none;
+}
+
+/* Headers */
+article header,
+div header,
+main header {
+    padding-top: 0;
+}
+
+header {
+    text-align: var(--justify-important);
+}
+
+header a b,
+header a em,
+header a i,
+header a strong {
+    margin-left: 0.5rem;
+    margin-right: 0.5rem;
+}
+
+header nav img {
+    margin: 1rem 0;
+}
+
+section header {
+    padding-top: 0;
+    width: 100%;
+}
+
+/* Nav */
+nav {
+    align-items: center;
+    display: flex;
+    font-weight: bold;
+    justify-content: space-between;
+    margin-bottom: 7rem;
+}
+
+nav ul {
+    list-style: none;
+    padding: 0;
+}
+
+nav ul li {
+    display: inline-block;
+    margin: 0 0.5rem;
+    position: relative;
+    text-align: left;
+}
+
+/* Nav Dropdown */
+nav ul li:hover ul {
+    display: block;
+}
+
+nav ul li ul {
+    background: var(--color-bg);
+    border: 1px solid var(--color-bg-secondary);
+    border-radius: var(--border-radius);
+    box-shadow: var(--box-shadow) var(--color-shadow);
+    display: none;
+    height: auto;
+    left: -2px;
+    padding: .5rem 1rem;
+    position: absolute;
+    top: 1.7rem;
+    white-space: nowrap;
+    width: auto;
+    z-index: 1;
+}
+
+nav ul li ul::before {
+    /* fill gap above to make mousing over them easier */
+    content: "";
+    position: absolute;
+    left: 0;
+    right: 0;
+    top: -0.5rem;
+    height: 0.5rem;
+}
+
+nav ul li ul li,
+nav ul li ul li a {
+    display: block;
+}
+
+/* Typography */
+code,
+samp {
+    background-color: var(--color-accent);
+    border-radius: var(--border-radius);
+    color: var(--color-text);
+    display: inline-block;
+    margin: 0 0.1rem;
+    padding: 0 0.5rem;
+}
+
+details {
+    margin: 1.3rem 0;
+}
+
+details summary {
+    font-weight: bold;
+    cursor: pointer;
+}
+
+h1,
+h2,
+h3,
+h4,
+h5,
+h6 {
+    line-height: var(--line-height);
+}
+
+h1 {
+    font-size: 1.875em;
+    border-bottom: 1px solid lightgray;
+}
+
+h2 {
+    font-size: 1.4em;
+}
+
+mark {
+    padding: 0.1rem;
+}
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+ol li,
+ul li {
+    padding: 0.2rem 0;
+}
+
+p {
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+    padding: 0;
+    width: 100%;
+}
+
+pre {
+    margin: 1rem 0;
+    max-width: var(--width-card-wide);
+    padding: 1rem 0;
+}
+
+pre code,
+pre samp {
+    display: block;
+    max-width: var(--width-card-wide);
+    padding: 0.8rem 2rem;
+    /*white-space: pre-wrap;*/
+    overflow-x: auto;
+}
+
+small {
+    color: var(--color-text-secondary);
+}
+
+sup {
+    background-color: var(--color-secondary);
+    border-radius: var(--border-radius);
+    color: var(--color-bg);
+    font-size: xx-small;
+    font-weight: bold;
+    margin: 0.2rem;
+    padding: 0.2rem 0.3rem;
+    position: relative;
+    top: -2px;
+}
+
+/* Links */
+a {
+    color: var(--color-link);
+    display: inline-block;
+    font-weight: bold;
+    text-decoration: underline;
+}
+
+a:active {
+    filter: brightness(var(--active-brightness));
+}
+
+a:hover {
+    filter: brightness(var(--hover-brightness));
+}
+
+a b,
+a em,
+a i,
+a strong,
+button,
+input[type="submit"] {
+    border-radius: var(--border-radius);
+    display: inline-block;
+    font-size: medium;
+    font-weight: bold;
+    line-height: var(--line-height);
+    margin: 0.5rem 0;
+    padding: 1rem 2rem;
+}
+
+button,
+input[type="submit"] {
+    font-family: var(--font-family);
+}
+
+button:active,
+input[type="submit"]:active {
+    filter: brightness(var(--active-brightness));
+}
+
+button:hover,
+input[type="submit"]:hover {
+    cursor: pointer;
+    filter: brightness(var(--hover-brightness));
+}
+
+a b,
+a strong,
+button,
+input[type="submit"] {
+    background-color: var(--color-link);
+    border: 2px solid var(--color-link);
+    color: var(--color-bg);
+}
+
+a em,
+a i {
+    border: 2px solid var(--color-link);
+    border-radius: var(--border-radius);
+    color: var(--color-link);
+    display: inline-block;
+    padding: 1rem 2rem;
+}
+
+article aside a {
+    color: var(--color-secondary);
+}
+
+/* Images */
+figure {
+    margin: 0;
+    padding: 0;
+    text-align: center;
+}
+
+figure img {
+    max-width: 100%;
+    max-height: 500px;
+}
+
+figure figcaption {
+    color: var(--color-text-secondary);
+}
+
+/* Forms */
+button:disabled,
+input:disabled {
+    background: var(--color-bg-secondary);
+    border-color: var(--color-bg-secondary);
+    color: var(--color-text-secondary);
+    cursor: not-allowed;
+}
+
+button[disabled]:hover,
+input[type="submit"][disabled]:hover {
+    filter: none;
+}
+
+form {
+    border: 1px solid var(--color-bg-secondary);
+    border-radius: var(--border-radius);
+    box-shadow: var(--box-shadow) var(--color-shadow);
+    display: block;
+    max-width: var(--width-card-wide);
+    min-width: var(--width-card);
+    padding: 1.5rem;
+    text-align: var(--justify-normal);
+}
+
+form header {
+    margin: 1.5rem 0;
+    padding: 1.5rem 0;
+}
+
+input,
+label,
+select,
+textarea {
+    display: block;
+    font-size: inherit;
+    max-width: var(--width-card-wide);
+}
+
+input[type="checkbox"],
+input[type="radio"] {
+    display: inline-block;
+}
+
+input[type="checkbox"]+label,
+input[type="radio"]+label {
+    display: inline-block;
+    font-weight: normal;
+    position: relative;
+    top: 1px;
+}
+
+input[type="range"] {
+    padding: 0.4rem 0;
+}
+
+input,
+select,
+textarea {
+    border: 1px solid var(--color-bg-secondary);
+    border-radius: var(--border-radius);
+    margin-bottom: 1rem;
+    padding: 0.4rem 0.8rem;
+}
+
+input[type="text"],
+textarea {
+    width: calc(100% - 1.6rem);
+}
+
+input[readonly],
+textarea[readonly] {
+    background-color: var(--color-bg-secondary);
+}
+
+label {
+    font-weight: bold;
+    margin-bottom: 0.2rem;
+}
+
+/* Popups */
+dialog {
+    border: 1px solid var(--color-bg-secondary);
+    border-radius: var(--border-radius);
+    box-shadow: var(--box-shadow) var(--color-shadow);
+    position: fixed;
+    top: 50%;
+    left: 50%;
+    transform: translate(-50%, -50%);
+    width: 50%;
+    z-index: 999;
+}
+
+/* Tables */
+table {
+    border: 1px solid var(--color-bg-secondary);
+    border-radius: var(--border-radius);
+    border-spacing: 0;
+    display: inline-block;
+    max-width: 100%;
+    overflow-x: auto;
+    padding: 0;
+    white-space: nowrap;
+}
+
+table td,
+table th,
+table tr {
+    padding: 0.4rem 0.8rem;
+    text-align: var(--justify-important);
+}
+
+table thead {
+    background-color: var(--color-table);
+    border-collapse: collapse;
+    border-radius: var(--border-radius);
+    /*color: var(--color-bg);*/
+    margin: 0;
+    padding: 0;
+}
+
+table thead th:first-child {
+    border-top-left-radius: var(--border-radius);
+}
+
+table thead th:last-child {
+    border-top-right-radius: var(--border-radius);
+}
+
+table thead th:first-child,
+table tr td:first-child {
+    text-align: var(--justify-normal);
+}
+
+table tr:nth-child(even) {
+    background-color: var(--color-accent);
+}
+
+/* Quotes */
+blockquote {
+    display: block;
+    font-size: x-large;
+    line-height: var(--line-height);
+    margin: 1rem auto;
+    max-width: var(--width-card-medium);
+    padding: 1.5rem 1rem;
+    text-align: var(--justify-important);
+}
+
+blockquote footer {
+    color: var(--color-text-secondary);
+    display: block;
+    font-size: small;
+    line-height: var(--line-height);
+    padding: 1.5rem 0;
+}
+
+/* Scrollbars */
+* {
+    scrollbar-width: thin;
+    scrollbar-color: rgb(202, 202, 232) auto;
+}
+
+*::-webkit-scrollbar {
+    width: 5px;
+    height: 5px;
+}
+
+*::-webkit-scrollbar-track {
+    background: transparent;
+}
+
+*::-webkit-scrollbar-thumb {
+    background-color: rgb(202, 202, 232);
+    border-radius: 10px;
+}
+
+h1.title {
+  border-bottom: 0px solid white;
+}
+
--- a/article/images/weather_station_schematic.svg
+++ b/article/images/weather_station_schematic.svg
--- a/article/template/custom_settings.tex
+++ b/article/template/custom_settings.tex
@@ -0,0 +1,16 @@
+% Override default figure placement To be within the flow of the text rather
+% than on it's own page.
+\usepackage{float}
+\usepackage{graphicx}
+\makeatletter
+\def\fps@figure{H}
+\makeatother
+
+% Scale all large images to 50% of twext width
+\makeatletter
+\setkeys{Gin}{width=\ifdim\Gin@nat@width>\linewidth
+    0.5\linewidth
+\else
+    \Gin@nat@width
+\fi}
+\makeatother
--- a/article/template/template.html
+++ b/article/template/template.html
@@ -0,0 +1,120 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" lang="$lang$" xml:lang="$lang$"$if(dir)$ dir="$dir$"$endif$>
+<head>
+  <meta charset="utf-8" />
+  <meta name="generator" content="pandoc" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
+$for(author-meta)$
+  <meta name="author" content="$author-meta$" />
+$endfor$
+$if(date-meta)$
+  <meta name="dcterms.date" content="$date-meta$" />
+$endif$
+$if(keywords)$
+  <meta name="keywords" content="$for(keywords)$$keywords$$sep$, $endfor$" />
+$endif$
+  <title>$if(title-prefix)$$title-prefix$ – $endif$$pagetitle$</title>
+$if(highlighting-css)$
+  <style type="text/css">
+$highlighting-css$
+  </style>
+$endif$
+$for(css)$
+  <link rel="stylesheet" href="$css$" />
+$endfor$
+<style type="text/css">
+  :root {
+  --width-content: 1080px;
+  }
+
+  nav {
+    justify-content: space-around;
+  }
+
+$if(quotes)$
+  q { quotes: "“" "”" "‘" "’"; }
+$endif$
+</style>
+$if(math)$
+  $math$
+$endif$
+$for(header-includes)$
+  $header-includes$
+$endfor$
+</head>
+<body>
+$for(include-before)$
+$include-before$
+$endfor$
+$if(title)$
+<header id="title-block-header">
+  <nav id="$idprefix$TOC">
+      <ul>
+          $if(toc)$
+          <li>
+            <a href="#">Index</a>
+            $table-of-contents$
+          </li>
+          $endif$
+          $if(pdf_version)$
+          <li>
+            <a href="$pdf_version$">PDF version</a>
+          </li>
+          $endif$
+          $if(git_repo)$
+          <li>
+            <a href="$git_repo$">Git repo</a>
+          </li>
+          $endif$
+          $if(website)$
+          <li>
+            <a href="$page_back$">Back</a>
+          </li>
+          $endif$
+      </ul>
+
+      <a href="https://www.meezenest.nl/mees/"><img alt="Logo" src="$logo$" height="70"></a>
+  </nav>
+<h1 class="title">$title$</h1>
+$if(subtitle)$
+<p class="subtitle">$subtitle$</p>
+$endif$
+$for(author)$
+<p class="author">$author$</p>
+$endfor$
+$if(date)$
+<p class="date">$date$</p>
+$endif$
+$if(pdf_version)$
+<p><a href="$pdf_version$"><i>PDF version</i></a></p>
+$endif$
+</header>
+$endif$
+<main>
+<article>
+$if(abstract)$
+<p><b>Abstract </b>$abstract$</p>
+$endif$
+$body$
+$for(include-after)$
+$include-after$
+$endfor$
+<hr>
+</article>
+</main>
+<footer>
+<p>&copy;
+$if(date)$
+ $date$
+$endif$
+$for(author)$
+ $author$
+$endfor$
+$if(website)$
+ <a href="$website$">$website$</a>
+$endif$
+</p><p>This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
+</p>
+</footer>
+</body>
+</html>
--- a/article/weather_station_article.html
+++ b/article/weather_station_article.html
@@ -0,0 +1,205 @@
+<!DOCTYPE html>
+<html xmlns="http://www.w3.org/1999/xhtml" lang="" xml:lang="">
+<head>
+  <meta charset="utf-8" />
+  <meta name="generator" content="pandoc" />
+  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
+  <meta name="author" content="M.T. Konstapel" />
+  <meta name="dcterms.date" content="2024-02-03" />
+  <title>APRS weerstation</title>
+  <link rel="stylesheet" href="./css/mvp.css" />
+<style type="text/css">
+  :root {
+  --width-content: 1080px;
+  }
+
+  nav {
+    justify-content: space-around;
+  }
+
+</style>
+</head>
+<body>
+<header id="title-block-header">
+  <nav id="TOC">
+      <ul>
+                    <li>
+            <a href="#">Index</a>
+            <ul>
+            <li><a href="#weerstation"
+            id="toc-weerstation">Weerstation</a></li>
+            <li><a href="#aprs" id="toc-aprs">APRS</a></li>
+            <li><a href="#hamnet" id="toc-hamnet">HamNet</a></li>
+            <li><a href="#meer-informatie" id="toc-meer-informatie">Meer
+            informatie</a></li>
+            <li><a href="#verantwoording"
+            id="toc-verantwoording">Verantwoording</a></li>
+            </ul>
+          </li>
+                              <li>
+            <a href="./weather_station_article.pdf">PDF version</a>
+          </li>
+                              <li>
+            <a href="https://git.meezenest.nl/marcel/weather_station">Git repo</a>
+          </li>
+                              <li>
+            <a href="https://meezenest.nl/mees/weather_station.html">Back</a>
+          </li>
+                </ul>
+
+      <a href="https://www.meezenest.nl/mees/"><img alt="Logo" src="./images/mees_logo.svg" height="70"></a>
+  </nav>
+<h1 class="title">APRS weerstation</h1>
+<p class="subtitle">met hamnet verbinding</p>
+<p class="author">M.T. Konstapel</p>
+<p class="date">2024-02-03</p>
+<p><a href="./weather_station_article.pdf"><i>PDF version</i></a></p>
+</header>
+<main>
+<article>
+<p><b>Abstract </b><p>Ik maak veel gebruik van het APRS netwerk:
+positiebepaling, telemetry en berichten versturen; ik doe het allemaal.
+Dit kan omdat ik dicht bij de Duitse grens woon: anders dan in Nederland
+waar het APRS netwerk dankzij lastige regelgeving nagenoeg is verdwenen,
+is in Duitsland het netwerk nog springlevend. Ik maak gebruik van Duitse
+digipeaters en iGates, die gewoon berichten vanaf het internet mogen
+doorzenden. Wat een geluk! Het enige wat ik nog niet kon, was
+weergegevens delen via het netwerk. Om daar verandering in te brengen
+heb ik een weerstation ontworpen dat elke 10 minuten een weerbericht kan
+uitzenden via het APRS netwerk. En omdat het systeem zo’n 100 meter van
+mijn huis in de acchtertuin staat, heb ik er ook een 5 GHz hamnet
+verbinding naar toe gemaakt, zodat ik het systeem op afstand kan
+bedienen. Het hamnet gebruik ik ook om de weermetingen naar mijn Grafana
+dashboard te sturen. Oh, en omdat twee beter is dan een heb ik er ook
+een 20KB/s hamnet link over 70cm LoRa als backup in geknutseld.</p></p>
+<h1 id="weerstation">Weerstation</h1>
+<p>Als uitgangspunt van het weerstation gebruik ik de SparkFun Weather
+Meter. Dit is een kit met drie sensors: een windvaan, een anemometer en
+een regenmeter. Deze kit heb ik aangevuld met sensors voor temperatuur,
+luchtdruk en luctvochtigheid. Al deze sensors zijn rechtstreeks
+aangesloten op een Arduino Mini Pro. Ik heb daar een RS-485 driverchip
+en een ompoolbeveiliging aan toegevoegd. Het uiteindelijke schema is
+hieronder te zien. Ingewikkeld is de hardware niet, want alle
+fuctionaliteit zit in de software.</p>
+<figure>
+<img src="./images/weather_station_schematic.svg" title="Schema"
+alt="Schema" />
+<figcaption aria-hidden="true">Schema</figcaption>
+</figure>
+<p>Het weerstation is uit te lezen via een ModBus interface. Dit is een
+industriestandaard, dus er zijn legio mogelijkheden om met het
+weerstation te communiceren. De ModBus registers bevatten de meetwaarden
+van de sensors en worden elke twee seconde ververst. Dit bepaald dus de
+maximale uitleesfrequentie. De volgende gegevens zijn beschikbaar:</p>
+<ul>
+<li>Windrichting in graden</li>
+<li>Gemiddelde wind snelheid van de laatste 10 minuten in m/s</li>
+<li>Maximale windstoot van de laatste 10 minuten in m/s</li>
+<li>Hoeveelheid regen in het afgelopen uur in mm</li>
+<li>Hoeveelheid regen in de afgelopen 24 uur in mm</li>
+<li>Temperatuur in graden C</li>
+<li>Luchtvochtigheid in %</li>
+<li>Luchtdruk in hPa</li>
+</ul>
+<p>Daarnaast zijn er nog een aantal statusregisters beschikbaar. Deze
+worden besproken in de uitgebreide bouwbeschrijving die beschikbaar is
+op mijn website.</p>
+<p>De luchtvochtigheidssensor kan bij een hoge luchtvochtigheid
+verzadigd raken en zo blijven steken op 100%. Om dit te voorkomen is het
+mogelijk om de sensor automatisch te laten verwarmen wanneer de
+luchtvochtigheid langer dan een uur boven de 96% is. De verwarming wordt
+dan elke 20 minuten voor 5 minuten aangezet. In de 15 minuten die
+overblijven koelt de sensor weer af tot de omgevingstemperatuur. Dit
+proces wordt heraald totdat de sensor weer een waarde beneden de 96%
+aangeeft. Tijdens het opwarmen en afkoelen kan de luchtvochtigheid en
+temperatuur maar eens in de 20 minuten worden gemeten. Dit is de prijs
+die betaald moet worden wanneer we een goedkope luchtvochtigheidssensor
+gebruiken.</p>
+<h1 id="aprs">APRS</h1>
+<p>Om de weermetingen te kunnen uitzenden via het APRS netwerk is er een
+2 meter FM zender (een oude Alinco portofoon) en een 1200baud modem (een
+variant op het MicroModem van markqvist) nodig. En een computer om de
+gegevens via de ModBus uit het weerstation te lezen en door te sturen
+naar het modem. Een Raspberry Pi Zero 2W is daar perfect geschikt voor.
+Deze is goedkoop, klein en verbruikt weinig energie. Omdat een APRS
+weerstation ook zijn positie en tijd moet doorgeven om op de kaart gezet
+te kunnen worden is er een GPS module via USB aangesloten op de
+Raspberry Pi. Strikt genomen is de tijd niet noodzakelijk en omdat het
+station vast is opgesteld kan de positie ook handmatig worden ingesteld,
+maar een gps module voegt weer extra complexiteit toe en dat maakt het
+project net weer wat interessanter. Een eenvoudig Python programma leest
+het weerstation uit, vraagt de positie en de tijd van de gps ontvanger
+op en construeerd het APRS frame dat uitgezonden moet worden. Dit frame
+wordt vervolgens via de Linux AX.25 stack naar het modem gestuurd.</p>
+<p>Omdat APRS over LoRa op de 70cm band steeds poulairder wordt heb ik
+ook een LoRa module op de Raspberry Pi aangeloten. Het weerbericht kan
+zo ook via LoRa worden uitgezonden. De software hiervoor is een in
+Python geschreven KISS interface. Via deze software kan de LoRa module
+gekoppeld worden aan de AX.25 stack. De Raspberry Pi ziet het modem als
+elk ander KISS compatible modem.</p>
+<p>Met een diplexer worden de signalen van beide zenders samengevoegd en
+gaan zo naar een dualband antene.</p>
+<h1 id="hamnet">HamNet</h1>
+<p>Het syteem kan autonoom werken, maar het is handig (en noodzakelijk)
+om het systeem van afstand te kunnen bedienen en wanneer dat nodig is
+ook uit te kunnen schakelen. Daarvoor heb ik een 5GHz HamLink tussen het
+huis en het weerstation aangelegt. Op deze manier heb ik een snelle
+netwerkverbinding naar de Raspberry Pi en kan ik via telnet inloggen en
+het systeem bedienen. De verbindig wordt ook gebruikt om verbindig te
+maken met het APRS-IS netwerk op het internet. Zo doet mijn weerstation
+ook dienst als RX-only iGate voor zowel traditioneel APRS als LoRa APRS.
+De HamNet link maakt gebruik van commercieel verkrijgbare schotels. Ik
+gebruik apparatuur van Unifi Ubiquiti, maar apparatuur van Mikrotik is
+even goed geschikt.</p>
+<p>De snelle netwerkverbinding is handig, maar wanneer het systeem
+autonoom werkt is het wel een beetje een overkill, want de verbinding
+wordt dan enkel gebruikt om APRS berichten door te sturen naar het
+APRS-IS netwerk. Daarom heb ik ook nog een lage snelheid
+netwerkverbinding geintegreerd. Deze heeft een doorvoersnelheid van iets
+meer dan 20KB/s, wat genoeg is voor de toepassing. Het is zelfs mogelijk
+om via deze langzame verbinding in te loggen via telnet. Dat gaat dan
+wat trager, maar als backup is het prima geschikt. Zo heb ik twee
+manieren om het systeem van afstand te beheren. De verbinding gaat over
+LoRa via de 70cm band. Hiervoor gebruik ik een kant en klaar board, een
+LilyGO TTGO T3 LoRa32 433MHz V1.6.1 ESP32. Hierop heb ik de Rnode
+firmware van unsigned.io gezet. Met de bijbehorende Linux software
+(tncattach) wordt dit een netwerkinterface onder Linux waarover ik het
+netwerkverkeer kan leiden.</p>
+<h1 id="meer-informatie">Meer informatie</h1>
+<p>Dit artikel is slechts een introductie van het APRS weerstation. Meer
+informatie is te vinden op mijn website https://meezenest.nl/mees Daar
+vind je uitgebreide documentatie en alle ontwerpbestanden en broncode
+die je nodig hebt om zelf aan deslag te gaan.</p>
+<h1 id="verantwoording">Verantwoording</h1>
+<p><a
+href="https://www.meezenest.nl/mees-elektronica/projects/weather_station/build_doc/weather_station.html">Bouwbeschrijving
+weerstation:
+https://www.meezenest.nl/mees-elektronica/projects/weather_station/build_doc/weather_station.html</a></p>
+<p><a
+href="https://www.meezenest.nl/mees-elektronica/packetmodem_nano.html">1200bd
+modem:
+https://www.meezenest.nl/mees-elektronica/packetmodem_nano.html</a></p>
+<p><a href="https://git.meezenest.nl/marcel/RPi-LoRa-KISS-TNC">LoRa KISS
+software: https://git.meezenest.nl/marcel/RPi-LoRa-KISS-TNC</a></p>
+<p><a
+href="https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html">Raspberry
+Pi met LoRa module:
+https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html</a></p>
+<p>Copyright (C) 2023, 2024 M.T. Konstapel - PE1RXF</p>
+<p><a
+href="https://meezenest.nl/mees/">https://meezenest.nl/mees/</a></p>
+<p>This work is licensed under a Creative Commons Attribution-ShareAlike
+4.0 International License.</p>
+<hr>
+</article>
+</main>
+<footer>
+<p>&copy;
+ 2024-02-03
+ M.T. Konstapel
+ <a href="https://meezenest.nl/mees/">https://meezenest.nl/mees/</a>
+</p><p>This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
+</p>
+</footer>
+</body>
+</html>
--- a/article/weather_station_article.md
+++ b/article/weather_station_article.md
@@ -0,0 +1,71 @@
+---
+title: APRS weerstation
+subtitle: met hamnet verbinding
+author: M.T. Konstapel
+date: 2024-02-03
+website: https://meezenest.nl/mees/
+page_back: https://meezenest.nl/mees/weather_station.html
+logo: ./images/mees_logo.svg
+pdf_version: ./weather_station_article.pdf
+git_repo: https://git.meezenest.nl/marcel/weather_station
+numbersections: true
+# Formatting:
+geometry: "a4paper, left=2.0cm, right=2.0cm, top=1.9cm, bottom=2.54cm"
+abstract: >
+  Ik maak veel gebruik van het APRS netwerk: positiebepaling, telemetry en berichten versturen; ik doe het allemaal. Dit kan omdat ik dicht bij de Duitse grens woon: anders dan in Nederland waar het APRS netwerk dankzij lastige regelgeving nagenoeg is verdwenen, is in Duitsland het netwerk nog springlevend. Ik maak gebruik van Duitse digipeaters en iGates, die gewoon berichten vanaf het internet mogen doorzenden. Wat een geluk! Het enige wat ik nog niet kon, was weergegevens delen via het netwerk. Om daar verandering in te brengen heb ik een weerstation ontworpen dat elke 10 minuten een weerbericht kan uitzenden via het APRS netwerk. En omdat het systeem zo'n 100 meter van mijn huis in de acchtertuin staat, heb ik er ook een 5 GHz hamnet verbinding naar toe gemaakt, zodat ik het systeem op afstand kan bedienen. Het hamnet gebruik ik ook om de weermetingen naar mijn Grafana dashboard te sturen. Oh, en omdat twee beter is dan een heb ik er ook een 20KB/s hamnet link over 70cm LoRa als backup in geknutseld.
+---
+
+# Weerstation
+
+Als uitgangspunt van het weerstation gebruik ik de SparkFun Weather Meter. Dit is een kit met drie sensors: een windvaan, een anemometer en een regenmeter. Deze kit heb ik aangevuld met sensors voor temperatuur, luchtdruk en luctvochtigheid. Al deze sensors zijn rechtstreeks aangesloten op een Arduino Mini Pro. Ik heb daar een RS-485 driverchip en een ompoolbeveiliging aan toegevoegd. Het uiteindelijke schema is hieronder te zien. Ingewikkeld is de hardware niet, want alle fuctionaliteit zit in de software.
+
+![Schema](./images/weather_station_schematic.svg "Schema")
+
+Het weerstation is uit te lezen via een ModBus interface. Dit is een industriestandaard, dus er zijn legio mogelijkheden om met het weerstation te communiceren. De ModBus registers bevatten de meetwaarden van de sensors en worden elke twee seconde ververst. Dit bepaald dus de maximale uitleesfrequentie. De volgende gegevens zijn beschikbaar:
+
+- Windrichting in graden
+- Gemiddelde wind snelheid van de laatste 10 minuten in m/s
+- Maximale windstoot van de laatste 10 minuten in m/s
+- Hoeveelheid regen in het afgelopen uur in mm
+- Hoeveelheid regen in de afgelopen 24 uur in mm
+- Temperatuur in graden C
+- Luchtvochtigheid in %
+- Luchtdruk in hPa
+
+Daarnaast zijn er nog een aantal statusregisters beschikbaar. Deze worden besproken in de uitgebreide bouwbeschrijving die beschikbaar is op mijn website.
+
+De luchtvochtigheidssensor kan bij een hoge luchtvochtigheid verzadigd raken en zo blijven steken op 100%. Om dit te voorkomen is het mogelijk om de sensor automatisch te laten verwarmen wanneer de luchtvochtigheid langer dan een uur boven de 96% is. De verwarming wordt dan elke 20 minuten voor 5 minuten aangezet. In de 15 minuten die overblijven koelt de sensor weer af tot de omgevingstemperatuur. Dit proces wordt heraald totdat de sensor weer een waarde beneden de 96% aangeeft. Tijdens het opwarmen en afkoelen kan de luchtvochtigheid en temperatuur maar eens in de 20 minuten worden gemeten. Dit is de prijs die betaald moet worden wanneer we een goedkope luchtvochtigheidssensor gebruiken.
+
+# APRS
+
+Om de weermetingen te kunnen uitzenden via het APRS netwerk is er een 2 meter FM zender (een oude Alinco portofoon) en een 1200baud modem (een variant op het MicroModem van markqvist) nodig. En een computer om de gegevens via de ModBus uit het weerstation te lezen en door te sturen naar het modem. Een Raspberry Pi Zero 2W is daar perfect geschikt voor. Deze is goedkoop, klein en verbruikt weinig energie. Omdat een APRS weerstation ook zijn positie en tijd moet doorgeven om op de kaart gezet te kunnen worden is er een GPS module via USB aangesloten op de Raspberry Pi. Strikt genomen is de tijd niet noodzakelijk en omdat het station vast is opgesteld kan de positie ook handmatig worden ingesteld, maar een gps module voegt weer extra complexiteit toe en dat maakt het project net weer wat interessanter. Een eenvoudig Python programma leest het weerstation uit, vraagt de positie en de tijd van de gps ontvanger op en construeerd het APRS frame dat uitgezonden moet worden. Dit frame wordt vervolgens via de Linux AX.25 stack naar het modem gestuurd.
+
+Omdat APRS over LoRa op de 70cm band steeds poulairder wordt heb ik ook een LoRa module op de Raspberry Pi aangeloten. Het weerbericht kan zo ook via LoRa worden uitgezonden. De software hiervoor is een in Python geschreven KISS interface. Via deze software kan de LoRa module gekoppeld worden aan de AX.25 stack. De Raspberry Pi ziet het modem als elk ander KISS compatible modem.
+
+Met een diplexer worden de signalen van beide zenders samengevoegd en gaan zo naar een dualband antene.
+
+# HamNet
+
+Het syteem kan autonoom werken, maar het is handig (en noodzakelijk) om het systeem van afstand te kunnen bedienen en wanneer dat nodig is ook uit te kunnen schakelen. Daarvoor heb ik een 5GHz HamLink tussen het huis en het weerstation aangelegt.  Op deze manier heb ik een snelle netwerkverbinding naar de Raspberry Pi en kan ik via telnet inloggen en het systeem bedienen. De verbindig wordt ook gebruikt om verbindig te maken met het APRS-IS netwerk op het internet. Zo doet mijn weerstation ook dienst als RX-only iGate voor zowel traditioneel APRS als LoRa APRS. De HamNet link maakt gebruik van commercieel verkrijgbare schotels. Ik gebruik apparatuur van Unifi Ubiquiti, maar apparatuur van Mikrotik is even goed geschikt.
+
+De snelle netwerkverbinding is handig, maar wanneer het systeem autonoom werkt is het wel een beetje een overkill, want de verbinding wordt dan enkel gebruikt om APRS berichten door te sturen naar het APRS-IS netwerk. Daarom heb ik ook nog een lage snelheid netwerkverbinding geintegreerd. Deze heeft een doorvoersnelheid van iets meer dan 20KB/s, wat genoeg is voor de toepassing. Het is zelfs mogelijk om via deze langzame verbinding in te loggen via telnet. Dat gaat dan wat trager, maar als backup is het prima geschikt. Zo heb ik twee manieren om het systeem van afstand te beheren. De verbinding gaat over LoRa via de 70cm band. Hiervoor gebruik ik een kant en klaar board, een LilyGO TTGO T3 LoRa32 433MHz V1.6.1 ESP32. Hierop heb ik de Rnode firmware van unsigned.io gezet. Met de bijbehorende Linux software (tncattach) wordt dit een netwerkinterface onder Linux waarover ik het netwerkverkeer kan leiden.
+
+# Meer informatie
+
+Dit artikel is slechts een introductie van het APRS weerstation. Meer informatie is te vinden op mijn website https://meezenest.nl/mees Daar vind je uitgebreide documentatie en alle ontwerpbestanden en broncode die je nodig hebt om zelf aan de slag te gaan.
+
+# Verantwoording
+
+[Bouwbeschrijving weerstation: https://www.meezenest.nl/mees-elektronica/projects/weather_station/build_doc/weather_station.html](https://www.meezenest.nl/mees-elektronica/projects/weather_station/build_doc/weather_station.html)
+
+[1200bd modem: https://www.meezenest.nl/mees-elektronica/packetmodem_nano.html](https://www.meezenest.nl/mees-elektronica/packetmodem_nano.html)
+
+[LoRa KISS software: https://git.meezenest.nl/marcel/RPi-LoRa-KISS-TNC](https://git.meezenest.nl/marcel/RPi-LoRa-KISS-TNC)
+
+[Raspberry Pi met LoRa module: https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html](https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html)
+
+Copyright (C) 2023, 2024  M.T. Konstapel - PE1RXF
+
+[https://meezenest.nl/mees/](https://meezenest.nl/mees/)
+
+This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
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@@ -1101,10 +1103,9 @@
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   id="path399" />
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-      <g
-   class="com.sun.star.drawing.ConnectorShape"
-   id="g411">
+      </g><g
+     class="com.sun.star.drawing.ConnectorShape"
+     id="g411">
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   id="id21">
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@@ -1129,10 +1130,9 @@
   d="m 9650,18950 -150,300 -150,-300 z"
   id="path408" />
       </g>
-      </g>
-      <g
-   class="com.sun.star.drawing.ConnectorShape"
-   id="g420">
+      </g><g
+     class="com.sun.star.drawing.ConnectorShape"
+     id="g420">
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   id="id22">
        <rect
@@ -1157,10 +1157,9 @@
   d="m 7700,19850 300,150 -300,150 z"
   id="path417" />
       </g>
-      </g>
-      <g
-   class="com.sun.star.drawing.ConnectorShape"
-   id="g429">
+      </g><g
+     class="com.sun.star.drawing.ConnectorShape"
+     id="g429">
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   id="id23">
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@@ -1185,10 +1184,7 @@
   d="m 11300,20150 -300,-150 300,-150 z"
   id="path426" />
       </g>
-      </g>
-     </g>
-    </g>
-   </g>
+      </g></g>
  </g>
 </g>
 </svg>
--- a/build-doc/template/template.html
+++ b/build-doc/template/template.html
@@ -68,7 +68,7 @@ $if(title)$
          $endif$
          $if(website)$
          <li>
-            <a href="$website$">Back</a>
+            <a href="$page_back$">Back</a>
          </li>
          $endif$
      </ul>
--- a/build-doc/weather_station.html
+++ b/build-doc/weather_station.html
@@ -5,7 +5,7 @@
  <meta name="generator" content="pandoc" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes" />
  <meta name="author" content="M.T. Konstapel" />
-  <meta name="dcterms.date" content="2024-01-15" />
+  <meta name="dcterms.date" content="2024-05-02" />
  <title>Weather station</title>
  <link rel="stylesheet" href="./css/mvp.css" />
 <style type="text/css">
@@ -47,8 +47,15 @@
            <li><a href="#theory-of-operation---software"
            id="toc-theory-of-operation---software">Theory of operation
            - Software</a></li>
+            <li><a href="#prototype"
+            id="toc-prototype">Prototype</a></li>
+            <li><a href="#specifications"
+            id="toc-specifications">Specifications</a></li>
            <li><a href="#schematic"
            id="toc-schematic">Schematic</a></li>
+            <li><a href="#problems-i-encounter-after-four-months-of-use"
+            id="toc-problems-i-encounter-after-four-months-of-use">Problems
+            I encounter after four months of use</a></li>
            <li><a href="#software-dependencies"
            id="toc-software-dependencies">Software
            dependencies</a></li>
@@ -59,10 +66,10 @@
            <a href="./weather_station.pdf">PDF version</a>
          </li>
                              <li>
-            <a href="https://git.meezenest.nl/">Git repo</a>
+            <a href="https://git.meezenest.nl/marcel/weather_station">Git repo</a>
          </li>
                              <li>
-            <a href="https://meezenest.nl/mees/">Back</a>
+            <a href="https://meezenest.nl/mees/weather_station.html">Back</a>
          </li>
                </ul>

@@ -71,7 +78,7 @@
 <h1 class="title">Weather station</h1>
 <p class="subtitle">with ModBus RTU interface</p>
 <p class="author">M.T. Konstapel</p>
-<p class="date">2024-01-15</p>
+<p class="date">2024-05-02</p>
 <p><a href="./weather_station.pdf"><i>PDF version</i></a></p>
 </header>
 <main>
@@ -89,7 +96,7 @@ people are obsessed with the weather. When I was a child, my grandmother
 was measuring the temperature and rainfall on a daily basis. My
 grandfather had an allotment, so he also was very interested in the
 weather. The first thing my father read in the newspaper was the weather
-report and the last thing he watched in the television was… the weather
+report and the last thing he watched on the television was… the weather
 report. And every hour he listed to the weather report on the radio. If
 he talked to someone he always started the conversation by talking about
 the weather. And when I open a new browser window, it automatically
@@ -508,7 +515,8 @@ alt="Microcontroller" />
 </figure>
 <p>Both the signals from the rain meter and the cup anemometer are
 connected to interrupt pins of the micro-controller. The signal from the
-rain meter is lightly filtered by C8.</p>
+rain meter is lightly filtered by C8. The output of the wind vane is
+connectd to an analog input of the micro-controller.</p>
 <p>The ModBus address can be set by DIP switch J9.</p>
 <h1 id="theory-of-operation---software">Theory of operation -
 Software</h1>
@@ -517,12 +525,14 @@ Software</h1>
 of the micro-controller. Every time its logic level changes an interrupt
 routine is called. This routine increments a counter and checks how many
 time has passed since the previous interrupt call. If the previous call
-was more than 2 seconds ago, the wind speed is (almost) zero. If the
-previous call was just over a second ago the interrupt counter now holds
-the amount of pulses in one second. This value is stored and from that
-value the wind speed can be calculated. If the previous call was under a
-second ago the measurement is still in progress and no further action is
-taken.</p>
+was more than 6 seconds ago, the wind speed is (almost) zero. If the
+previous call was just over 3 second ago the interrupt counter now holds
+the amount of pulses in three seconds. This value is stored and from
+that value the wind speed can be calculated. If the previous call was
+less than 3 seconds ago the measurement is still in progress and no
+further action is taken. A measurment period of three seconds is choosen
+because it is the standard as used by the Dutch meteorological institute
+(KNMI).</p>
 <figure>
 <img src="./images/wind_speed_diagram.svg" title="Wind speed interrupt"
 alt="Wind speed interrupt" />
@@ -552,19 +562,30 @@ sensor can become saturated with moisture it can get stuck at 100%. This
 happens in particular with fog or other high humidity and condensing
 weather types. The sensor has a build in heater to drive of moisture and
 thus preventing this problem. Because the temperature of the sensor
-rises when the heater is turned on, accurate ambient temperature
-readings are no longer possible. But with a smart algorithm it is
-possible to get the benefits of the build in heater while still being
+rises when the heater is turned on, accurate ambient temperature and
+humidity readings are no longer possible. But with a smart algorithm it
+is possible to get the benefits of the build in heater while still being
 able to use the sensor as an ambient thermometer.</p>
 <p>When the humidity rises above 95% for more than an hour the current
-temperature is stored and the heater is switched on for 10 minutes. Than
-the heater is switched off again. If after 10 minutes the humidity is
-still above 95% the heater is turned on again for another 10 minutes.
-But not before the temperature is measured and stored, as the sensor is
-now cooled off to ambient temperature. If the humidity is below 95% the
-sensor is free from moisture and the process is not repeated for another
-hour.</p>
-<p>Flow chart under development.</p>
+temperature and humidity are stored and the heater is switched on for 5
+minutes. Than the heater is switched off again. If after 15 minutes the
+humidity is still above 95% the heater is turned on again for another 5
+minutes. But not before the temperature and humidity are measured and
+stored, as the sensor is now cooled off to ambient temperature. If the
+humidity is below 95% the sensor is free from moisture and the process
+is not repeated for another hour.</p>
+<p>When the heater algorithm is active, the temperature and humidity
+values are updated every 20 minutes instead of every 2 seconds. Statis
+bit 0 (ModBus register 30014) indicated if the heater is on or off and
+status bit 1 gives the update rate of the temperature and humidity
+values.</p>
+<p>This algorithm can be enabled by setting the HeaterCoil (see ModBus
+secion).</p>
+<figure>
+<img src="./images/smart_heater.svg" title="Heater algorithm"
+alt="Heater algorithm" />
+<figcaption aria-hidden="true">Heater algorithm</figcaption>
+</figure>
 <h2 id="temperature-1">Temperature</h2>
 <p>The temperature is read from the humidity sensor as this sensor gives
 the most accurate temperature readings. When the heater is on (see
@@ -582,8 +603,8 @@ boring.</p>
 now, the ModBus address is hard coded as 14 in the software. The values
 are available in the input registers and can be read via function code
 04.</p>
-<p>Below an example of how to read the wind direction in Python using
-the minimalmodbus library.</p>
+<p>Below an example of how to read the wind direction and enable the
+heater algorithm in Python using the minimalmodbus library.</p>
 <pre><code>#!/usr/bin/env python3
 import minimalmodbus

@@ -591,11 +612,15 @@ import minimalmodbus
 instrument = minimalmodbus.Instrument(&#39;/dev/ttyUSB1&#39;, 14)

 # register number, number of decimals, function code
-wind_direction = instrument.read_register(1, 0, 4)
-print(wind_direction)</code></pre>
-<h3 id="input-registers">Input registers</h3>
-<p>The measurements and order of the measurements are the same as for
-APRS weather reports. But of course we use SI units.</p>
+wind_direction = instrument.read_register(1, 1, 4)
+print(wind_direction)
+
+# register address, value, function code
+instrument.write_bit(0, 1, 5)</code></pre>
+<h3 id="input-registers-read-only">Input registers (read only)</h3>
+<p>Input registers are numbered 30001 to 39999 but have data addresses
+0x000 to 0x270E. The measurements and order of the measurements are the
+same as for APRS weather reports. But of course we use SI units.</p>
 <table>
 <colgroup>
 <col style="width: 13%" />
@@ -611,85 +636,91 @@ APRS weather reports. But of course we use SI units.</p>
 </thead>
 <tbody>
 <tr class="odd">
-<td>30000</td>
+<td>00</td>
 <td>Device ID (0x5758)</td>
 <td>NO UNIT</td>
 </tr>
 <tr class="even">
-<td>30001</td>
+<td>01</td>
 <td>Wind direction</td>
-<td>degrees</td>
+<td>degrees * 10</td>
 </tr>
 <tr class="odd">
-<td>30002</td>
+<td>02</td>
 <td>Wind speed (average of 10 minutes)</td>
 <td>m/s * 100</td>
 </tr>
 <tr class="even">
-<td>30003</td>
+<td>03</td>
 <td>Wind gust (peak of last 10 minutes)</td>
 <td>m/s * 100</td>
 </tr>
 <tr class="odd">
-<td>30004</td>
+<td>04</td>
 <td>Temperature (two’s complement)</td>
 <td>degrees Celcius * 100</td>
 </tr>
 <tr class="even">
-<td>30005</td>
+<td>05</td>
 <td>Rain last hour</td>
 <td>l/m2 * 100</td>
 </tr>
 <tr class="odd">
-<td>30006</td>
+<td>06</td>
 <td>Rain last 24 hours</td>
 <td>l/m2 * 100</td>
 </tr>
 <tr class="even">
-<td>30007</td>
+<td>07</td>
 <td>Rain since midnight</td>
 <td>NOT IMPLEMENTED</td>
 </tr>
 <tr class="odd">
-<td>30008</td>
+<td>08</td>
 <td>Humidity</td>
 <td>percent * 100</td>
 </tr>
 <tr class="even">
-<td>30009</td>
+<td>09</td>
 <td>Barometric pressure</td>
 <td>hPa * 10</td>
 </tr>
 <tr class="odd">
-<td>30010</td>
+<td>10</td>
 <td>Luminosity</td>
 <td>W/m2</td>
 </tr>
 <tr class="even">
-<td>30011</td>
+<td>11</td>
 <td>Snow fall</td>
 <td>NOT IMPLEMENTED</td>
 </tr>
 <tr class="odd">
-<td>30012</td>
+<td>12</td>
 <td>Raw rain counter</td>
-<td>NOT IMPLEMENTED</td>
+<td>l/m2 * 100</td>
 </tr>
 <tr class="even">
-<td>30013</td>
+<td>13</td>
 <td>Temperature (two’s complement)</td>
 <td>degrees Celcius * 100</td>
 </tr>
 <tr class="odd">
-<td>30014</td>
+<td>14</td>
 <td>Status bits</td>
 <td>see table below</td>
 </tr>
 </tbody>
 </table>
-<p><sup>NOTE</sup> Register 30013 holds the backup temperature reading
-from the pressure sensor.</p>
+<p><sup>NOTE</sup> Register 13 holds the backup temperature reading from
+the pressure sensor.</p>
 <table>
+<colgroup>
+<col style="width: 18%" />
+<col style="width: 31%" />
+<col style="width: 25%" />
+<col style="width: 24%" />
+</colgroup>
 <thead>
 <tr class="header">
 <th>Status bits</th>
@@ -705,15 +736,164 @@ from the pressure sensor.</p>
 <td>heater off</td>
 <td>heater on</td>
 </tr>
+<tr class="even">
+<td>1</td>
+<td>Temp/humidity update</td>
+<td>every 20 minutes</td>
+<td>every 2 seconds</td>
+</tr>
+<tr class="odd">
+<td>2</td>
+<td>Heater algorithm</td>
+<td>disabled</td>
+<td>enabled</td>
+</tr>
 </tbody>
 </table>
 <p>The ModBus registers are 16 bit wide. For better precision, some
 units are scaled by a factor of 10 or 100. This way, values with up to
 two decimal points can be stored as 16 bit integer values. Just divide
 by 10 or 100 to get the floating point values.</p>
+<h3 id="output-coils-write-only">Output coils (write only)</h3>
+<p>Output coils registers are numbered 1 to 9999 but have data addresses
+0x000 to 0x270E. The default value of a register is 0.</p>
+<table>
+<thead>
+<tr class="header">
+<th>Address</th>
+<th>Description</th>
+<th>logic 0</th>
+<th>logic 1</th>
+</tr>
+</thead>
+<tbody>
+<tr class="odd">
+<td>0</td>
+<td>Heater algorithm</td>
+<td>disabled</td>
+<td>enabled</td>
+</tr>
+</tbody>
+</table>
+<h1 id="prototype">Prototype</h1>
+<p>I wanted to locate the weather station at about 100 meters from the
+house. That meant that interfacing the weather station was not just a
+matter of connecting a wire to it. And 100 meters is also a bit much for
+a wifi connection. As I already had experience with LoRa I opted for
+that. But not LoRaWAN, but LoRa APRS. This is a ham radio network that I
+often use. I even run my own digipeater. So LoRa APRS it is.</p>
+<figure>
+<img src="./images/prototype_block_diagram.svg"
+title="Block diagram of the prototype"
+alt="Block diagram of the prototype" />
+<figcaption aria-hidden="true">Block diagram of the
+prototype</figcaption>
+</figure>
+<p>The weather station’s RS-485 interface is connected to a Raspberry Pi
+Zero 2W running the aprx digipeater software, as well as some specially
+written Python programs to interface the build in LoRa transceiver, the
+GPS module and the weather station itself. Every 10 minutes the
+digipeater will read the weather station’s registers and sends the data
+as PE1RXF telemetry messages (see <a
+href="https://www.meezenest.nl/mees-elektronica/projects/aprs_telemetry/APRS_protocol_nodes_PE1RXF.pdf">https://www.meezenest.nl/mees-elektronica/projects/aprs_telemetry/APRS_protocol_nodes_PE1RXF.pdf</a>)
+over the APRS network to a server, which presents the data in a Grafana
+dashboard. The digipeater can also send standardized APRS weather
+reports over the APRS network. But more about this project can be found
+here: <a
+href="https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html">https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html</a></p>
+<figure>
+<img src="./images/prototype_overview_small.jpg"
+title="The prototype in the garden" alt="The prototype in the garden" />
+<figcaption aria-hidden="true">The prototype in the garden</figcaption>
+</figure>
+<p>As a housing for the prototype, I used an old beehive. These are
+weatherproof and I had one laying around.</p>
+<figure>
+<img src="./images/prototype_sensors_small.jpg"
+title="Closeup of the sensors" alt="Closeup of the sensors" />
+<figcaption aria-hidden="true">Closeup of the sensors</figcaption>
+</figure>
+<figure>
+<img src="./images/prototype_inside_annotations_small.jpg"
+title="Inside the beehive" alt="Inside the beehive" />
+<figcaption aria-hidden="true">Inside the beehive</figcaption>
+</figure>
+<h1 id="specifications">Specifications</h1>
+<h2 id="wind">Wind</h2>
+<ul>
+<li><p>Wind speed is measured by taking 3 second averages from the cup
+anemometer and using these samples to calculate the average over a 10
+minute periode.</p></li>
+<li><p>Wind gust is measured by taking 3 second averages from the cup
+anemometer.</p></li>
+<li><p>Wind vane has 8 main directions and another 8 directions in
+between. But these last do not have the same weight, eg. these positions
+are not as likely to be measured as the main directions. This is due to
+the construction of the wind vane: it has eight reed switches for the
+main directions and if the wind direction happens to sit exactly in
+between two reed switches, both switches are closed giving the extra 8
+sub directions. Not great, but it is what it is…</p></li>
+</ul>
+<h2 id="rain">Rain</h2>
+<pre><code>Resolution: 0.2794 mm/impulse</code></pre>
+<h2 id="humidity-2">Humidity</h2>
+<pre><code>Operating range   :  0 - 100 % RH
+Recommended range : 20 - 80 % RH
+Accuracy          : +/- 3 % RH (0-80 % RH)
+                    +/- 4.5 % (max when &gt; 80 % RH)
+
+Heater to drive of moisture (can be enabled via ModBus)</code></pre>
+<h2 id="pressure">Pressure</h2>
+<pre><code>Operating range : 300 - 1100 hPa
+Accuracy        : +/- 1.0 hPa (0 - 65 °C)
+                  +/- 1.7 hPa (-20 - 0 °C)</code></pre>
+<h2 id="temperature-2">Temperature</h2>
+<pre><code>Main sensor
+-----------
+
+Operating range : -10 - 85 °C (typ)
+                  -40 - 85 °C (max)
+Accuracy        : +/- 0.3 °C (typ)
+                  +/- 0.4 °C (max)
+                  +/- 0.5 °C (max when &lt; -10°C)
+
+Backup sensor
+-------------
+
+Operating range :   0 - 65 °C (typ)
+                  -40 - 85 °C (max)
+Accuracy        : +/- 0.5 °C (25 °C)
+                  +/- 1.0 °C (0 - 65 °C)</code></pre>
+<h2 id="modbus-1">ModBus</h2>
+<pre><code>Physical : RS-485 simplex RTU
+Settings : 9600 bd 8N1
+Address  : 14</code></pre>
 <h1 id="schematic">Schematic</h1>
 <p><a href="./images/weather_station_schematic.pdf"><img
 src="./images/weather_station_schematic.svg" alt="Schematic" /></a></p>
+<h1 id="problems-i-encounter-after-four-months-of-use">Problems I
+encounter after four months of use</h1>
+<p>The Si7021 humidity sensor is not made for outdoor use. The datasheet
+is clear about that. But a lot of people use this cheap sensor for
+weather stations anyway. So I choose this sensor for my design. But that
+was not smart. After an initial time without any problems, the sensor
+started to saturate. This happened during a very wet and mild winter we
+had. My first solution was to utilize the build in heater to drive of
+the moisture. That worked, but only for a short period. The heater blew
+up and the sensor started to report humidity levels above 100% and
+because of a bug in the firmware of the sensor, the humidity register
+wrapped around and the sensor reported humidity levels of 0-30%. I tried
+to find a software solution, which worked for a while, but the sensor
+deteriorated even more. To the point of being totally useless. So I
+searched for another, better sensor. And I found the HYT-221 from
+Innovative Sensor Technology. This sensor is designed to work outdoors
+and can even be used in saunas, where the humidity levels are always
+high and the air is condensating. The datasheet specifically mentions
+outdoor weather stations as an application. The only downside is its
+price: it is ten times more expensive than the Si7021.</p>
+<p>The sensor can be controlled via the I2C bus, so implementing the new
+sensor in the firmware was very easy. From version 0.3.0 onward, this
+sensor is used. The Si7021 is removed from the code.</p>
 <!---
 # Bill of materials

@@ -735,6 +915,8 @@ src="./images/weather_station_schematic.svg" alt="Schematic" /></a></p>
 <p>Libraries are included with the source code of this project</p>
 <h1 id="license">License</h1>
 <p>Copyright (C) 2023, 2024 M.T. Konstapel</p>
+<p><a
+href="https://meezenest.nl/mees/">https://meezenest.nl/mees/</a></p>
 <p>The software is published as open-source software (GPL). The hardware
 is published as open-source hardware (OSH).</p>
 <h2 id="software">Software</h2>
@@ -750,7 +932,7 @@ option) any later version.</p>
 </main>
 <footer>
 <p>&copy;
- 2024-01-15
+ 2024-05-02
 M.T. Konstapel
 <a href="https://meezenest.nl/mees/">https://meezenest.nl/mees/</a>
 </p><p>This work is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-sa/4.0/">Creative Commons Attribution-ShareAlike 4.0 International License</a>.
--- a/build-doc/weather_station.md
+++ b/build-doc/weather_station.md
@@ -2,11 +2,12 @@
 title: Weather station
 subtitle: with ModBus RTU interface
 author: M.T. Konstapel
-date: 2024-01-15
+date: 2024-05-02
 website: https://meezenest.nl/mees/
+page_back: https://meezenest.nl/mees/weather_station.html
 logo: ./images/mees_logo.svg
 pdf_version: ./weather_station.pdf
-git_repo: https://git.meezenest.nl/
+git_repo: https://git.meezenest.nl/marcel/weather_station
 numbersections: true
 # Formatting:
 geometry: "a4paper, left=2.0cm, right=2.0cm, top=1.9cm, bottom=2.54cm"
@@ -16,7 +17,7 @@ abstract: >

 # Why do you need a weather station?

-Well, you don't...because if you want to know the weather, you look on your phone. So why bother than? Because since the beginning of time, people are obsessed with the weather. When I was a child, my grandmother was measuring the temperature and rainfall on a daily basis. My grandfather had an allotment, so he also was very interested in the weather. The first thing my father read in the newspaper was the weather report and the last thing he watched in the television was... the weather report. And every hour he listed to the weather report on the radio. If he talked to someone he always started the conversation by talking about the weather. And when I open a new browser window, it automatically opens the weather page.
+Well, you don't...because if you want to know the weather, you look on your phone. So why bother than? Because since the beginning of time, people are obsessed with the weather. When I was a child, my grandmother was measuring the temperature and rainfall on a daily basis. My grandfather had an allotment, so he also was very interested in the weather. The first thing my father read in the newspaper was the weather report and the last thing he watched on the television was... the weather report. And every hour he listed to the weather report on the radio. If he talked to someone he always started the conversation by talking about the weather. And when I open a new browser window, it automatically opens the weather page.

 So the weather is fascinating and taking your own measurements is a lot of fun.

@@ -210,7 +211,7 @@ The heart of the circuit is an Arduino Pro Mini, which is basically an Atmel ATm

 ![Microcontroller](./images/micro-controller.svg "Microcontroller")

-Both the signals from the rain meter and the cup anemometer are connected to interrupt pins of the micro-controller. The signal from the rain meter is lightly filtered by C8.
+Both the signals from the rain meter and the cup anemometer are connected to interrupt pins of the micro-controller. The signal from the rain meter is lightly filtered by C8. The output of the wind vane is connectd to an analog input of the micro-controller.

 The ModBus address can be set by DIP switch J9.

@@ -218,7 +219,7 @@ The ModBus address can be set by DIP switch J9.

 ## Wind speed

-The pulse from the cup anemometer is connected to an interrupt input of the micro-controller. Every time its logic level changes an interrupt routine is called. This routine increments a counter and checks how many time has passed since the previous interrupt call. If the previous call was more than 2 seconds ago, the wind speed is (almost) zero. If the previous call was just over a second ago the interrupt counter now holds the amount of pulses in one second. This value is stored and from that value the wind speed can be calculated. If the previous call was under a second ago the measurement is still in progress and no further action is taken.
+The pulse from the cup anemometer is connected to an interrupt input of the micro-controller. Every time its logic level changes an interrupt routine is called. This routine increments a counter and checks how many time has passed since the previous interrupt call. If the previous call was more than 6 seconds ago, the wind speed is (almost) zero. If the previous call was just over 3 second ago the interrupt counter now holds the amount of pulses in three seconds. This value is stored and from that value the wind speed can be calculated. If the previous call was less than 3 seconds ago the measurement is still in progress and no further action is taken. A measurment period of three seconds is choosen because it is the standard as used by the Dutch meteorological institute (KNMI).

 ![Wind speed interrupt](./images/wind_speed_diagram.svg "Wind speed interrupt")

@@ -236,11 +237,15 @@ The pulse from the rain meter is connected to an interrupt input of the micro-co

 ## Humidity

-Via the I²C bus, the humidity value of the sensor is read. As the sensor can become saturated with moisture it can get stuck at 100%. This happens in particular with fog or other high humidity and condensing weather types. The sensor has a build in heater to drive of moisture and thus preventing this problem. Because the temperature of the sensor rises when the heater is turned on, accurate ambient temperature readings are no longer possible. But with a smart algorithm it is possible to get the benefits of the build in heater while still being able to use the sensor as an ambient thermometer.
+Via the I²C bus, the humidity value of the sensor is read. As the sensor can become saturated with moisture it can get stuck at 100%. This happens in particular with fog or other high humidity and condensing weather types. The sensor has a build in heater to drive of moisture and thus preventing this problem. Because the temperature of the sensor rises when the heater is turned on, accurate ambient temperature and humidity readings are no longer possible. But with a smart algorithm it is possible to get the benefits of the build in heater while still being able to use the sensor as an ambient thermometer.

-When the humidity rises above 95% for more than an hour the current temperature is stored and the heater is switched on for 10 minutes. Than the heater is switched off again. If after 10 minutes the humidity is still above 95% the heater is turned on again for another 10 minutes. But not before the temperature is measured and stored, as the sensor is now cooled off to ambient temperature. If the humidity is below 95% the sensor is free from moisture and the process is not repeated for another hour.
+When the humidity rises above 95% for more than an hour the current temperature and humidity are stored and the heater is switched on for 5 minutes. Than the heater is switched off again. If after 15 minutes the humidity is still above 95% the heater is turned on again for another 5 minutes. But not before the temperature and humidity are measured and stored, as the sensor is now cooled off to ambient temperature. If the humidity is below 95% the sensor is free from moisture and the process is not repeated for another hour.

-Flow chart under development.
+When the heater algorithm is active, the temperature and humidity values are updated every 20 minutes instead of every 2 seconds. Statis bit 0 (ModBus register 30014) indicated if the heater is on or off and status bit 1 gives the update rate of the temperature and humidity values.
+
+This algorithm can be enabled by setting the HeaterCoil (see ModBus secion).
+
+![Heater algorithm](./images/smart_heater.svg "Heater algorithm")

 ## Temperature

@@ -258,7 +263,7 @@ This sensor is still under development.

 The weather station uses ModBus RTU over a simplex RS-485 line. For now, the ModBus address is hard coded as 14 in the software. The values are available in the input registers and can be read via function code 04.

-Below an example of how to read the wind direction in Python using the minimalmodbus library.
+Below an example of how to read the wind direction and enable the heater algorithm in Python using the minimalmodbus library.

    #!/usr/bin/env python3
    import minimalmodbus
@@ -267,43 +272,132 @@ Below an example of how to read the wind direction in Python using the minimalmo
    instrument = minimalmodbus.Instrument('/dev/ttyUSB1', 14)

    # register number, number of decimals, function code
-    wind_direction = instrument.read_register(1, 0, 4)
+    wind_direction = instrument.read_register(1, 1, 4)
    print(wind_direction)

-### Input registers
+    # register address, value, function code
+    instrument.write_bit(0, 1, 5)

-The measurements and order of the measurements are the same as for APRS weather reports. But of course we use SI units.
+### Input registers (read only)
+
+Input registers are numbered 30001 to 39999 but have data addresses 0x000 to 0x270E. The measurements and order of the measurements are the same as for APRS weather reports. But of course we use SI units.

 | Address | Description                         | Units                 |
 |---------|-------------------------------------|-----------------------|
-| 30000   | Device ID (0x5758)                  | NO UNIT               |
-| 30001   | Wind direction                      | degrees               |
-| 30002   | Wind speed (average of 10 minutes)  | m/s * 100             |
-| 30003   | Wind gust (peak of last 10 minutes) | m/s * 100             |
-| 30004   | Temperature (two's complement)      | degrees Celcius * 100 |
-| 30005   | Rain last hour                      | l/m2 * 100            |
-| 30006   | Rain last 24 hours                  | l/m2 * 100            |
-| 30007   | Rain since midnight                 | NOT IMPLEMENTED       |
-| 30008   | Humidity                            | percent * 100         |
-| 30009   | Barometric pressure                 | hPa * 10              |
-| 30010   | Luminosity                          | W/m2                  |
-| 30011   | Snow fall                           | NOT IMPLEMENTED       |
-| 30012   | Raw rain counter                    | NOT IMPLEMENTED       |
-| 30013   | Temperature (two's complement)      | degrees Celcius * 100 |
-| 30014   | Status bits                         | see table below       |
+| 00      | Device ID (0x5758)                  | NO UNIT               |
+| 01      | Wind direction                      | degrees * 10          |
+| 02      | Wind speed (average of 10 minutes)  | m/s * 100             |
+| 03      | Wind gust (peak of last 10 minutes) | m/s * 100             |
+| 04      | Temperature (two's complement)      | degrees Celcius * 100 |
+| 05      | Rain last hour                      | l/m2 * 100            |
+| 06      | Rain last 24 hours                  | l/m2 * 100            |
+| 07      | Rain since midnight                 | NOT IMPLEMENTED       |
+| 08      | Humidity                            | percent * 100         |
+| 09      | Barometric pressure                 | hPa * 10              |
+| 10      | Luminosity                          | W/m2                  |
+| 11      | Snow fall                           | NOT IMPLEMENTED       |
+| 12      | Raw rain counter                    | l/m2 * 100            |
+| 13      | Temperature (two's complement)      | degrees Celcius * 100 |
+| 14      | Status bits                         | see table below       |

-^NOTE^ Register 30013 holds the backup temperature reading from the pressure sensor.
+^NOTE^ Register 13 holds the backup temperature reading from the pressure sensor.

-| Status bits | Description   | logic 0    | logic 1   |
-|-------------|---------------|------------|-----------|
-| 0           | Heater status | heater off | heater on |
+| Status bits | Description          | logic 0          | logic 1         |
+|-------------|----------------------|------------------|-----------------|
+| 0           | Heater status        | heater off       | heater on       |
+| 1           | Temp/humidity update | every 20 minutes | every 2 seconds |
+| 2           | Heater algorithm     | disabled         | enabled         |

 The ModBus registers are 16 bit wide. For better precision, some units are scaled by a factor of 10 or 100. This way, values with up to two decimal points can be stored as 16 bit integer values. Just divide by 10 or 100 to get the floating point values.

+### Output coils (write only)
+
+Output coils registers are numbered 1 to 9999 but have data addresses 0x000 to 0x270E. The default value of a register is 0.
+
+| Address | Description      | logic 0  | logic 1 |
+|---------|------------------|----------|---------|
+| 0       | Heater algorithm | disabled | enabled |
+
+# Prototype
+
+I wanted to locate the weather station at about 100 meters from the house. That meant that interfacing the weather station was not just a matter of connecting a wire to it. And 100 meters is also a bit much for a wifi connection. As I already had experience with LoRa I opted for that. But not LoRaWAN, but LoRa APRS. This is a ham radio network that I often use. I even run my own digipeater. So LoRa APRS it is.
+
+![Block diagram of the prototype](./images/prototype_block_diagram.svg "Block diagram of the prototype")
+
+The weather station's RS-485 interface is connected to a Raspberry Pi Zero 2W running the aprx digipeater software, as well as some specially written Python programs to interface the build in LoRa transceiver, the GPS module and the weather station itself. Every 10 minutes the digipeater will read the weather station's registers and sends the data as PE1RXF telemetry messages (see [https://www.meezenest.nl/mees-elektronica/projects/aprs_telemetry/APRS_protocol_nodes_PE1RXF.pdf](https://www.meezenest.nl/mees-elektronica/projects/aprs_telemetry/APRS_protocol_nodes_PE1RXF.pdf)) over the APRS network to a server, which presents the data in a Grafana dashboard. The digipeater can also send standardized APRS weather reports over the APRS network. But more about this project can be found here: [https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html](https://www.meezenest.nl/mees-elektronica/RPi_LoRa_shield.html)
+
+![The prototype in the garden](./images/prototype_overview_small.jpg "The prototype in the garden")
+
+As a housing for the prototype, I used an old beehive. These are weatherproof and I had one laying around.
+
+![Closeup of the sensors](./images/prototype_sensors_small.jpg "Closeup of the sensors")
+
+![Inside the beehive](./images/prototype_inside_annotations_small.jpg "Inside the beehive")
+
+# Specifications
+
+## Wind
+
+- Wind speed is measured by taking 3 second averages from the cup anemometer and using these samples to calculate the average over a 10 minute periode.
+
+- Wind gust is measured by taking 3 second averages from the cup anemometer.
+
+- Wind vane has 8 main directions and another 8 directions in between. But these last do not have the same weight, eg. these positions are not as likely to be measured as the main directions.  This is due to the construction of the wind vane: it has eight reed switches for the main directions and if the wind direction happens to sit exactly in between two reed switches, both switches are closed giving the extra 8 sub directions. Not great, but it is what it is...
+
+## Rain
+
+    Resolution: 0.2794 mm/impulse
+
+## Humidity
+
+    Operating range   :  0 - 100 % RH
+    Recommended range : 20 - 80 % RH
+    Accuracy          : +/- 3 % RH (0-80 % RH)
+                        +/- 4.5 % (max when > 80 % RH)
+
+    Heater to drive of moisture (can be enabled via ModBus)
+
+## Pressure
+
+    Operating range : 300 - 1100 hPa
+    Accuracy        : +/- 1.0 hPa (0 - 65 °C)
+                      +/- 1.7 hPa (-20 - 0 °C)
+
+## Temperature
+
+    Main sensor
+    -----------
+
+    Operating range : -10 - 85 °C (typ)
+                      -40 - 85 °C (max)
+    Accuracy        : +/- 0.3 °C (typ)
+                      +/- 0.4 °C (max)
+                      +/- 0.5 °C (max when < -10°C)
+
+    Backup sensor
+    -------------
+
+    Operating range :   0 - 65 °C (typ)
+                      -40 - 85 °C (max)
+    Accuracy        : +/- 0.5 °C (25 °C)
+                      +/- 1.0 °C (0 - 65 °C)
+
+## ModBus
+
+    Physical : RS-485 simplex RTU
+    Settings : 9600 bd 8N1
+    Address  : 14
+
 # Schematic

 [![Schematic](./images/weather_station_schematic.svg)](./images/weather_station_schematic.pdf)

+# Problems I encounter after four months of use
+
+The Si7021 humidity sensor is not made for outdoor use. The datasheet is clear about that. But a lot of people use this cheap sensor for weather stations anyway. So I choose this sensor for my design. But that was not smart. After an initial time without any problems, the sensor started to saturate. This happened during a very wet and mild winter we had. My first solution was to utilize the build in heater to drive of the moisture. That worked, but only for a short period. The heater blew up and the sensor started to report humidity levels above 100% and because of a bug in the firmware of the sensor, the humidity register wrapped around and the sensor reported humidity levels of 0-30%. I tried to find a software solution, which worked for a while, but the sensor deteriorated even more. To the point of being totally useless. So I searched for another, better sensor. And I found the HYT-221 from Innovative Sensor Technology. This sensor is designed to work outdoors and can even be used in saunas, where the humidity levels are always high and the air is condensating. The datasheet specifically mentions outdoor weather stations as an application. The only downside is its price: it is ten times more expensive than the Si7021.
+
+The sensor can be controlled via the I2C bus, so implementing the new sensor in the firmware was very easy. From version 0.3.0 onward, this sensor is used. The Si7021 is removed from the code.
+
 <!---
 # Bill of materials

@@ -329,6 +423,8 @@ Libraries are included with the source code of this project

 Copyright (C) 2023, 2024  M.T. Konstapel

+[https://meezenest.nl/mees/](https://meezenest.nl/mees/)
+
 The software is published as open-source software (GPL). The hardware is published as open-source hardware (OSH).

 ## Software
--- a/build-doc/weather_station.pdf
+++ b/build-doc/weather_station.pdf
--- a/build-doc/weather_station_article.md
+++ b/build-doc/weather_station_article.md
@@ -0,0 +1,57 @@
+---
+title: APRS weerstation
+subtitle: met hamnet verbinding
+author: M.T. Konstapel
+date: 2024-02-03
+website: https://meezenest.nl/mees/
+page_back: https://meezenest.nl/mees/weather_station.html
+logo: ./images/mees_logo.svg
+pdf_version: ./weather_station_article.pdf
+git_repo: https://git.meezenest.nl/marcel/weather_station
+numbersections: true
+# Formatting:
+geometry: "a4paper, left=2.0cm, right=2.0cm, top=1.9cm, bottom=2.54cm"
+abstract: >
+  Ik maak veel gebruik van het APRS netwerk: positiebepaling, telemetry en berichten versturen; ik doe het allemaal. Dit kan omdat ik dicht bij de Duitse grens woon: anders dan in Nederland waar het APRS netwerk dankzij lastige regelgeving nagenoeg is verdwenen, is in Duitsland het netwerk nog springlevend. Ik maak gebruik van Duitse digipeaters en iGates, die gewoon berichten vanaf het internet mogen doorzenden. Wat een geluk! Het enige wat ik nog niet kon, was weergegevens delen via het netwerk. Om daar verandering in te brengen heb ik een weerstation ontworpen dat elke 10 minuten een weerbericht kan uitzenden via het APRS netwerk. En omdat het systeem zo'n 100 meter van mijn huis in de acchtertuin staat, heb ik er ook een 5 GHz hamnet verbinding naar toe gemaakt, zodat ik het systeem op afstand kan bedienen. Oh, en omdat twee beter is dan een heb ik er ook een 20KB/s hamnet link over 70cm LoRa als backup in geknutseld. Het hamnet gebruik ik ook om de weermetingen naar mijn Grafana dashboard te sturen.
+---
+
+# Weerstation
+
+Als uitgangspunt van het weerstation gebruik ik de SparkFun Weather Meter. Dit is een kit met drie sensors: een windvaan, een anemometer en een regenmeter. Deze kit heb ik aangevuld met sensors voor temperatuur, luchtdruk en luctvochtigheid. Al deze sensors zijn rechtstreeks aangesloten op een Arduino Mini Pro. Ik heb daar een RS-485 driverchip en een ompoolbeveiliging aan toegevoegd. Het uiteindelijke schema is hieronder te zien. Ingewikkeld is de hardware niet, want alle fuctionaliteit zit in de software.
+
+Het weerstation is uit te lezen via een ModBus interface. Dit is een industriestandaard, dus er zijn legio mogelijkheden om met het weerstation te communiceren. De ModBus registers bevatten de meetwaarden van de sensors en worden elke twee seconde ververst. Dit bepaald dus de maximale uitleesfrequentie. De volgende gegevens zijn beschikbaar:
+
+- Windrichting in graden
+- Gemiddelde wind snelheid van de laatste 10 minuten in m/s
+- Maximale windstoot van de laatste 10 minuten in m/s
+- Hoeveelheid regen in het afgelopen uur in mm
+- Hoeveelheid regen in de afgelopen 24 uur in mm
+- Temperatuur in graden C
+- Luchtvochtigheid in %
+- Luchtdruk in hPa
+
+Daarnaast zijn er nog een aantal statusregisters beschikbaar. Deze worden besproken in de uitgebreide bouwbeschrijving die beschikbaar is op mijn website.
+
+De Luchtvochtigheidssensor kan bij een hoge Luchtvochtigheid verzadigd raken en zo blijven steken op 100%. Om dit te voorkomen is het mogelijk om de sensor automatisch te laten verwarmen wanneer de luchtvochtigheid langer dan een uur boven de 96% is. De verwarming wordt dan elke 20 minuten voor 5 minuten aangezet. In de 15 minuten die overblijven koelt de sensor weer af tot de omgevingstemperatuur. Dit proces wordt heraald totdat de sensor weer een waarde beneden de 96% aangeeft. Tijdens het opwarmen en afkoelen kan de luchtvochtigheid en temperatuur maar eens in de 20 minuten worden gemeten. Dit is de prijs die betaald moet worden wanneer we een goedkope luchtvochtigheidssensor gebruiken.
+
+# APRS iGate
+
+Om de weermetingen te kunnen uitzenden via het APRS netwerk is er een 2 meter FM zender en een 1200baud modem nodig. En een computer om de gegevens via de ModBus uit het weerstation te lezen en door te sturen naar het modem. Een Raspberry Pi Zero 2W is daar perfect geschikt voor. Deze is goedkoop, klein en verbruikt weinig energie. Omdat een APRS weerstation ook zijn positie en tijd moet doorgeven om op de kaart gezet te kunnen worden gezet is er een GPS module via USB aangesloten op de Raspberry Pi. Strikt genomen is de tijd niet noodzakelijk en omdat het station vast is opgesteld kan de positie ook handmatig worden ingesteld. Een eenvoudig Python programma leest het weerstation uit, vraagt de positie en de tijd van de gps ontvanger op en construeerd het APRS frame dat uitgezonden moet worden. Dit frame wordt vervolgens via de AX.25 stack naar het modem gestuurd.
+
+Omdat APRS over LoRa op de 70cm band steeds poulairder wordt heb ik ook een LoRa module op de Raspberry Pi aangeloten. Het weerbericht kan zo ook via LoRa worden uitgezonden. Met een diplexer worden de signalen van beide zenders samengevoegd en gaan zo naar een dualband antene. De software hiervoor is een in Python geschreven KISS interface. Via deze software kan de LoRa module gekoppeld worden aan de AX.25 stack. De Raspberry Pi ziet het modem als elk ander KISS compatible modem.
+
+# HamNet
+
+Het syteem kan autonoom werken, maar het is handig (en noodzakelijk) om het systeem van afstand te kunnen bedienen en wanneer dat nodig is ook uit te kunnen schakelen. Daarvoor heb ik een 5GHz HamLink tussen het huis en de Raspberry Pi aangelegt.  Op deze manier heb ik een snelle netwerkverbinding naar het weerstation en kan ik via telnet inloggen en het systeem bedienen. De HamNet link maakt gebruik van commercieel verkrijgbare schotels. Ik gebruik apparatuur van Unifi Ubiquiti, maar apparatuur van Mikrotik is even goed geschikt. Deze verbindig wordt ook gebruikt om verbindig te maken met et APRS-IS netwerk op het internet. Zo doet mijn weerstation ook dienst als RX-only iGate voor zowel traditioneel APRS als LoRa APRS.
+
+De snelle netwerkverbinding is handog, maar wanneer het systeem autonoom werkt is het wel een beetje een overkill, want de verbinding wordt dan enkel gebruikt om APRS berichten door te sturen naar het APRS-IS netwerk. Daarom heb ik ook nog een lage snelheid netwerkverbinding geintegreerd. Deze heeft een doorvoersnelheid van iets meer dan 20KB/s, wat genoeg is voor de toepassing. Het is zelfs mogelijk om daarnaast ook nog in te loggen via telnet. Dat gaat dan wat trager, maar als backup is het prima geschikt. Zo heb ik twee manieren om het systeem van afstand te beheren. De verbinding gaat over LoRa via de 70cm band. Hiervoor gebruik ik een kant en klaar board, een LilyGO TTGO T3 LoRa32 433MHz V1.6.1 ESP32. Hierom heb ik firmware van unsigned.io gezet. Met de bijbehorende Linux software (tncattach) wordt dit een netwerkinterface onder Linux waarover ik het netwerkverkeer kan leiden.
+
+![SparkFun Weather Meter](./images/SparkFun-Weather_Meter.jpg "SparkFun Weather Meter")
+
+# Verantwoording
+
+Copyright (C) 2023, 2024  M.T. Konstapel - PE1RXF
+
+[https://meezenest.nl/mees/](https://meezenest.nl/mees/)
+
+This work is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License.
--- a/221_application_note.pdf
+++ b/221_application_note.pdf
--- a/221_datasheet.pdf
+++ b/221_datasheet.pdf
--- a/datasheet/Handboek_H05_knmi_definities.pdf
+++ b/datasheet/Handboek_H05_knmi_definities.pdf
--- a/firmware/weather_station.ino
+++ b/firmware/weather_station.ino
@@ -27,6 +27,16 @@
 *    You should have received a copy of the GNU General Public License
 *    along with weather_station. If not, see <https://www.gnu.org/licenses/>.
 *
+ * 2023-01-21: - Buffer overflow when calculating average wind speed in AverageOfArray()
+ *               Fix: use 32 bit register for average_value.
+ *             - Changed some variables to the propper standard (uint8_t, uint16_t, etc.)
+ *             - SparkFun wind interrupt now calculates over 3 seconds in stead of 1 second (KNMI standard)
+ *
+ * 2-24-05-02: - Removed cope for si7021
+ *             - Added code for HYT221 humidity sensor
+ *
+ * See CHANGELOG.md
+ *
 **********************************************************************************/
 #include <ModbusSerial.h>
 #include "SparkFun_Weather_Meter_Kit_Arduino_Library.h"
@@ -36,8 +46,7 @@
 #include "i2c.h"

 //Temperature and humidity sensor
-#include "i2c_SI7021.h"
-SI7021 si7021;
+#define HYT_ADDR 0x28     // I2C address of the HYT 221, 271, 371 and most likely the rest of the family

 // Pressure sensor
 #include "i2c_BMP280.h"
@@ -67,9 +76,14 @@ const byte SlaveId = 14;
 * 30004: Temperature (degrees Celcius)
 * 30005: Rain last hour (l/m2)
 * 30006: Rain last 24 hours (l/m2)
- * 30007: Rain since midnight (l/m2)
+ * 30007: Rain since midnight (l/m2) [NOT IMPLEMENTED, always 0]
 * 30008: Humidity (percent)
 * 30009: Barometric pressure (hPa)
+ * 30010: Luminosity (W/m2)
+ * 30011: Snow fall [NOT IMPLEMENTED, always 0]
+ * 30012: Raw rainfall counter (mm)
+ * 30013: Temperature pressure sensor (degrees Celsius)
+ * 30014: Status bits 0=heater, 1-15: reserved
 *
 */
 const int SensorIDIreg                = 0;
@@ -82,6 +96,19 @@ const int SensorRainLast24Ireg        = 6;
 const int SensorRainSinceMidnightIreg = 7;
 const int SensorHumidityIreg          = 8;
 const int SensorPressureIreg          = 9;
+const int SensorLuminosityIreg        = 10;
+const int SensorSnowFallIreg          = 11;
+const int SensorRainfallRawIreg       = 12;
+const int SensorTemperatureBackupIreg = 13;
+const int SensorStatusBitsIreg        = 14;
+
+/* Modbus Registers Offsets (0-9999)
+ * Coils
+ * 0 = Heater algorithm (0 = disable, 1 = enable)
+ */
+const int HeaterCoil = 0;
+float HUMIDITY_THRESHOLD = 92.0;
+
 // RS-485 serial port 
 #define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
 const unsigned long Baudrate = 9600;
@@ -97,109 +124,125 @@ ModbusSerial mb (MySerial, SlaveId, TxenPin);

 unsigned long ts;
 unsigned long HourTimer;
-int WindGustData1[30];
-unsigned char WindGustData1Counter=0;
-int WindGustData2[10];
-unsigned char WindGustData2Counter=0;
-int WindAverageData1[30];
-unsigned char WindAverageData1Counter=0;
-int WindAverageData2[10];
-unsigned char WindAverageData2Counter=0;
-int RainPerHour[24];
-unsigned char RainPerHourCounter=0;
+uint16_t WindGustData1[30];
+uint8_t WindGustData1Counter=0;
+uint16_t WindGustData2[10];
+uint8_t WindGustData2Counter=0;
+uint16_t WindAverageData1[30];
+uint8_t WindAverageData1Counter=0;
+uint16_t WindAverageData2[10];
+uint8_t WindAverageData2Counter=0;
+uint16_t RainPerHour[24];
+uint8_t RainPerHourCounter=0;

 struct MeasuredData {
-  int WindDirection;
-  int WindSpeed;
-  int WindGust;
-  int Rain;
-  int RainLast24;
-  int SensorRainSinceMidnight;
-  int Pressure;
+  uint16_t WindDirection;
+  uint16_t WindSpeed;
+  uint16_t WindGust;
+  uint16_t Rain;
+  uint16_t RainLast24;
+  uint16_t SensorRainSinceMidnight;
+  uint16_t Pressure;
+  uint16_t Luminosity;
+  uint16_t StatusBits = 0;
+  uint16_t RainfallCounter = 0;

  float Temperature;
  float Humidity;
+  float TemperatureBackup;

  bool HeaterStatus = 0;
 } MeasuredData;

-// Read Si7021 sensor and process data
-void ReadSi7021 (void)
+void ReadHYT221 (void)
 {
-    si7021.triggerMeasurement();
-    si7021.getHumidity(MeasuredData.Humidity);
-    si7021.getTemperature(MeasuredData.Temperature);
-
-    if (MeasuredData.Humidity>100 || MeasuredData.Humidity<0)
-      MeasuredData.Humidity = 100;
-
-    //If humidity is larger than 96% switch on heater to get more acurate measurement and prevent memory offset
-    //Switch off when lower than 94% (hysteresis)
-    if (MeasuredData.Humidity > 96 && !MeasuredData.HeaterStatus) {
-      Serial.print(F("Heater on."));
-      MeasuredData.HeaterStatus = 1;
-      si7021.setHeater(MeasuredData.HeaterStatus);
-    }
-    if (MeasuredData.Humidity < 94 && MeasuredData.HeaterStatus) {
-      Serial.print(F("Heater off."));
-      MeasuredData.HeaterStatus = 0;
-      si7021.setHeater(MeasuredData.HeaterStatus);
-    }
+  double humidity;
+  double temperature;
+  
+  Wire.beginTransmission(HYT_ADDR);   // Begin transmission with given device on I2C bus
+  Wire.requestFrom(HYT_ADDR, 4);      // Request 4 bytes 
+  
+  // Read the bytes if they are available
+  // The first two bytes are humidity the last two are temperature
+  if(Wire.available() == 4) {                   
+    int b1 = Wire.read();
+    int b2 = Wire.read();
+    int b3 = Wire.read();
+    int b4 = Wire.read();
+    
+    Wire.endTransmission();           // End transmission and release I2C bus
+    
+    // combine humidity bytes and calculate humidity
+    int rawHumidity = b1 << 8 | b2;
+    // compound bitwise to get 14 bit measurement first two bits
+    // are status/stall bit (see intro text)
+    rawHumidity =  (rawHumidity &= 0x3FFF);
+    humidity = 100.0 / pow(2,14) * rawHumidity;
    
    // Scale for more decimal positions when converted to integer value for ModBus
-    MeasuredData.Humidity *= 100;
-    MeasuredData.Temperature *= 100;
+      MeasuredData.Humidity = 100 * humidity;
+
+    // combine temperature bytes and calculate temperature
+    b4 = (b4 >> 2); // Mask away 2 least significant bits see HYT 221 doc
+    int rawTemperature = b3 << 6 | b4;
+    temperature = 165.0 / pow(2,14) * rawTemperature - 40;
+
+    // Scale for more decimal positions when converted to integer value for ModBus
+    MeasuredData.Temperature = 100 * temperature;
+    
+    //Serial.print(MeasuredData.Humidity);
+    //Serial.print("% - Temperature: ");
+    //Serial.println(MeasuredData.Temperature);
+  }
+  else {
+    Serial.println("Not enough bytes available on wire.");
+  }
 }

 // Read BMP280
 void ReadBMP280 (void)
 {
-//  MeasuredData.Pressure=0;
-
  bmp280.awaitMeasurement();

-  float temperature;
-  bmp280.getTemperature(temperature);
-
  float pascal;
  bmp280.getPressure(pascal);
-
  pascal = (pascal - PRESSURE_OFFSET) / 10;  // Convert to hPa
-
  MeasuredData.Pressure = pascal;

+  bmp280.getTemperature(MeasuredData.TemperatureBackup);
+  // Scale for more decimal positions when converted to integer value for ModBus
+  MeasuredData.TemperatureBackup *= 100;
+  
  bmp280.triggerMeasurement();

-  // When humidity is high, the heater of the Si7021 is on. This causes the temperature sensor of the humidity sensor to heat up.
-  // Use temperature sensor of BMP280 instead.
-  if (MeasuredData.HeaterStatus) {
-    bmp280.getTemperature(MeasuredData.Temperature);
-    // Scale for more decimal positions when converted to integer value for ModBus
-    MeasuredData.Temperature *= 100;
-  }
-
 }

-int MaxOfArray (int array[], unsigned int length)
+int MaxOfArray (int array[], uint16_t length)
 {
  int maximum_value = 0;
-  
-  while (length--)
+
+  while (length)
  {
+    // decrement length, because 0/1 problem: if lenght = n, than last position off array is n-1
+    length--;
+ 
    if (array[length] > maximum_value)
      maximum_value = array[length];
  }
  return maximum_value;
 }

-int AverageOfArray (int array[], unsigned int length)
+uint16_t AverageOfArray (uint16_t array[], uint16_t length)
 {
-  int tmp_value = 0;
-  unsigned char tmp_length = length;
-  int average_value = 0;
- 
-  while (length--)
+  uint32_t tmp_value = 0;
+  uint8_t tmp_length = length;
+  uint16_t average_value = 0;
+
+  while (length)
  {
+    // decrement length, because 0/1 problem: if lenght = n, than last position off array is n-1
+    length--;
+
    tmp_value += array[length];
  }
  average_value = tmp_value/tmp_length;
@@ -214,14 +257,15 @@ void ReadSparkfunWeatherStation (void)

  float tmpRegister;

-  MeasuredData.WindDirection = weatherMeterKit.getWindDirection();
+  tmpRegister = 10*weatherMeterKit.getWindDirection();  // Use float for conversion to degrees times 10, than put it in integer register for ModBus
+  MeasuredData.WindDirection = tmpRegister;
  tmpRegister = 100*(weatherMeterKit.getWindSpeed())/3.6;  // Use float for conversion to m/s times 100, than put it in integer register for ModBus
  MeasuredData.WindSpeed = tmpRegister;
  tmpRegister = 100*weatherMeterKit.getTotalRainfall();    // Use float for conversion to l/m2 times 100, than put it in integer register for ModBus
  MeasuredData.Rain = tmpRegister;

  // FIFO for calculating wind gust of last 10 minutes
-  // to preserve valuable RAM we caanot store all measurements of the last 10 minutes.
+  // to preserve valuable RAM we cannot store all measurements of the last 10 minutes.
  // So we use a hack: store the last 30 values in a FIFO and every minute we store the maximum value from this FIFO in another FIFO.
  // This second FIFO is 10 deep: it stores the maximum values of the last 10 minutes.
  // The maximum value from this FIFO is the maximum wind gust of the last 10 minutes.
@@ -279,6 +323,9 @@ void ReadSparkfunWeatherStation (void)
      RainPerHourCounter=0;
    }
    RainPerHour[RainPerHourCounter] = MeasuredData.Rain;
+    // Every time before we reset the TotalRainCounter we add the amount to the RawRainCounter.
+    // This 16 bit register will eventually overflow, but 655.35mm of rain fall is a lot!
+    MeasuredData.RainfallCounter += MeasuredData.Rain;  // We don't care about the rounding error due to the convertion from float to int
    weatherMeterKit.resetTotalRainfall();

    // Calculate rain fall in the last 24 hours
@@ -320,31 +367,33 @@ void setup() {
  mb.addIreg (SensorRainSinceMidnightIreg);
  mb.addIreg (SensorHumidityIreg);
  mb.addIreg (SensorPressureIreg);
+  mb.addIreg (SensorLuminosityIreg);
+  mb.addIreg (SensorSnowFallIreg);
+  mb.addIreg (SensorRainfallRawIreg);
+  mb.addIreg (SensorTemperatureBackupIreg);
+  mb.addIreg (SensorStatusBitsIreg);
+
+  // Add HeaterCoil register
+  mb.addCoil (HeaterCoil);
    
  // Set Weather station ID
  mb.Ireg (SensorIDIreg, 0x5758);
  // Set unused register to zero
  mb.Ireg (SensorRainSinceMidnightIreg, 0);
+  mb.Ireg (SensorSnowFallIreg, 0);
 
-  Serial.println(F("Weather station v0.1.0"));
+  Serial.println(F("Weather station v0.3.0"));
  Serial.println(F("(C)2024 M.T. Konstapel"));
  Serial.println(F("This project is free and open source"));
  Serial.println(F("More details: https://meezenest.nl/mees/"));

-  //Initialize Si7021 sensor
-  Serial.print(F("Humidity sensor SI7021 "));
-  if (si7021.initialize())
-    Serial.println(F("found"));
-  else
-  {
-    Serial.println(F("missing"));
-    while(1) {
-      digitalWrite(LED_BUILTIN, HIGH);  // turn the LED on (HIGH is the voltage level)
-      delay(500);                      // wait for half a second
-      digitalWrite(LED_BUILTIN, LOW);   // turn the LED off by making the voltage LOW
-      delay(500);  
-    }
-  }
+  // The standard library of the Si7021 sets the heater element to the default 3.1mA, but we want the full power
+  // We could alter the library, but than we break compatibility. So for this one time we do a raw-write to the 
+  // heater register.
+  const uint8_t SI7021_I2C_ADDRESS 		              =(0x40);
+  const uint8_t SI7021_CMD_WRITE_HEATER_CONTROL_REG =(0x51);
+  const uint8_t SI7021_HEATER_FULL_BLAST            =(0x0F); // Set heater to 94mA
+  i2c.writeByte(SI7021_I2C_ADDRESS, SI7021_CMD_WRITE_HEATER_CONTROL_REG, SI7021_HEATER_FULL_BLAST);

  // Initialize BMP280 pressure sensor
  Serial.print(F("Pressure sensor BMP280 "));
@@ -425,7 +474,9 @@ void setup() {
  // is implemented in the library that averages the wind speed over a certain
  // time period, which defaults to 1 second. Longer intervals result in more
  // accurate measurements, but cause delay in the measurement
-  calibrationParams.windSpeedMeasurementPeriodMillis = 1000;
+  // Dutch metrology institute (KNMI) defines that the windspeed and gust should
+  // be calculated from 3 seconds measurements.
+  calibrationParams.windSpeedMeasurementPeriodMillis = 3000;

  // Now we can set all the calibration parameters at once
  weatherMeterKit.setCalibrationParams(calibrationParams);
@@ -450,7 +501,7 @@ void loop() {
    digitalWrite(LED_BUILTIN, HIGH);  // LED as heartbeat

    // Read temperature and humidity
-    ReadSi7021();
+    ReadHYT221();

    // Read pressure and temperature
    ReadBMP280();
@@ -467,11 +518,22 @@ void loop() {
    mb.Ireg (SensorTemperatureIreg, MeasuredData.Temperature);
    mb.Ireg (SensorHumidityIreg, MeasuredData.Humidity);
    mb.Ireg (SensorPressureIreg, MeasuredData.Pressure);
+    mb.Ireg (SensorTemperatureBackupIreg, MeasuredData.TemperatureBackup);
+    mb.Ireg (SensorLuminosityIreg, MeasuredData.Luminosity);
+    mb.Ireg (SensorRainfallRawIreg, MeasuredData.RainfallCounter);
+    mb.Ireg (SensorStatusBitsIreg, MeasuredData.StatusBits);

    // Debug wind vane
    //Serial.print(F("\n    Measured ADC: "));
    //Serial.print(analogRead(windDirectionPin));

+    // enable or disable smart heater
+    if (mb.Coil (HeaterCoil)) {
+      MeasuredData.StatusBits |= 0x04;  // Set bit
+    } else {
+      MeasuredData.StatusBits &= 0x0B;  // Reset bit
+    }
+
    digitalWrite(LED_BUILTIN, LOW);  // LED as heartbeat


--- a/test_software/pycache/epever_control.cpython-36.pyc
+++ b/test_software/pycache/epever_control.cpython-36.pyc
--- a/test_software/epever_control.py
+++ b/test_software/epever_control.py
@@ -43,15 +43,19 @@ class EpeverChargeController(minimalmodbus.Instrument):

    @retry(wait_fixed=200, stop_max_attempt_number=5)
    def retriable_read_register(
-        self, registeraddress, number_of_decimals, functioncode
+        self, registeraddress, number_of_decimals, functioncode,  signed=False
    ):
        return self.read_register(
-            registeraddress, number_of_decimals, functioncode, False
+            registeraddress, number_of_decimals, functioncode, signed
        )

    @retry(wait_fixed=200, stop_max_attempt_number=5)
    def retriable_read_bit(self, registeraddress, functioncode):
        return self.read_bit(registeraddress, functioncode)
+
+    @retry(wait_fixed=200, stop_max_attempt_number=5)
+    def retriable_write_bit(self, registeraddress, data, functioncode):
+        return self.write_bit(registeraddress, data, functioncode)
    
    #Address range 0x3000
    def get_id(self):
@@ -60,7 +64,7 @@ class EpeverChargeController(minimalmodbus.Instrument):

    def get_wind_direction(self):
        """PV array rated current"""
-        return self.retriable_read_register(1, 0, 4)
+        return self.retriable_read_register(1, 1, 4)

    def get_wind_speedl(self):
        """PV array rated power (low 16 bits)"""
@@ -72,7 +76,7 @@ class EpeverChargeController(minimalmodbus.Instrument):

    def get_temperature(self):
        """Rated Battery's voltage"""
-        return self.retriable_read_register(4, 2, 4)
+        return self.retriable_read_register(4, 2, 4, True)

    def get_rain(self):
        """Rated charging current to battery"""
@@ -93,3 +97,17 @@ class EpeverChargeController(minimalmodbus.Instrument):
    def get_pressure(self):
        """Charging mode: 0x0001 = PWM"""
        return self.retriable_read_register(9, 1, 4)
+
+    def get_temperature_backup(self):
+        """Charging mode: 0x0001 = PWM"""
+        return self.retriable_read_register(13, 2, 4,True)
+
+    def get_status_bits(self):
+        """Charging mode: 0x0001 = PWM"""
+        return self.retriable_read_register(14, 0, 4)
+
+    def enable_heater(self):
+        self.retriable_write_bit(0, 1, 5)
+
+    def disable_heater(self):
+        self.retriable_write_bit(0, 0, 5)
--- a/test_software/weather_station_rs485_client.py
+++ b/test_software/weather_station_rs485_client.py
@@ -594,7 +594,9 @@ elif dump_file:
    dump_all_registers()
    
 else:
-
+    status = 1
+    print("Enable heater function")
+    controller.enable_heater()
    while (1):
        time.sleep(3) # Sleep for 3 seconds
        print ("Retrieving all known registers.")
@@ -608,6 +610,8 @@ else:
        rawdat['Temperature'] = controller.get_temperature()
        rawdat['Humidity'] = controller.get_humidity()
        rawdat['Pressure'] = controller.get_pressure()
+        rawdat['Temp backup'] = controller.get_temperature_backup()
+        rawdat['Status bits'] = controller.get_status_bits()

        print (json.dumps(rawdat, indent=1, sort_keys=False))
Author	SHA1	Message	Date
marcel	eeb6bd846c	Removed Si7021 and added HYT221 humidity sensor	2024-05-02 11:04:41 +02:00
marcel	71a3a48af7	Si7021 wrap around bug now has a partial workaround	2024-03-13 11:37:44 +01:00
marcel	33a5bbbc24	Si7021 wrap around bug now has a partial workaround	2024-03-13 11:35:45 +01:00
marcel	6c1134ca3a	Solved classic 0/1 error in source code	2024-03-11 12:58:36 +01:00
marcel	08b845f792	Heater algoritm now 10/10min, was 5/15min	2024-02-28 16:30:15 +01:00
marcel	82342b82a5	Link in README.md is now correct	2024-01-22 18:17:09 +01:00
marcel	309fef8c1d	Typos fixed	2024-01-22 18:01:21 +01:00
marcel	d71e334bd8	build-doc updated with prototype	2024-01-22 15:01:02 +01:00
marcel	e1331d6266	Buffer overflow windspeed fixed	2024-01-21 16:05:37 +01:00
marcel	74175ab241	Removed debug time interval heater	2024-01-17 19:10:54 +01:00
marcel	4d9767edda	Tweaked settings heater algorithm	2024-01-17 19:04:53 +01:00
marcel	e99422412e	Added heather algorithm	2024-01-17 16:07:02 +01:00