build-doc updated with prototype

Buffer overflow windspeed fixed
Removed debug time interval heater
25 changed files with 2379 additions and 2047 deletions
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@ -26,3 +26,28 @@ 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] - 2023-01-21
+
+### 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)]
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--- 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="2024-01-22" />
  <title>Weather station</title>
  <link rel="stylesheet" href="./css/mvp.css" />
 <style type="text/css">
@ -47,6 +47,10 @@
            <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="#software-dependencies"
@ -71,7 +75,7 @@
 <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">2024-01-22</p>
 <p><a href="./weather_station.pdf"><i>PDF version</i></a></p>
 </header>
 <main>
@ -89,7 +93,7 @@ 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
@ -517,12 +521,14 @@ 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 +558,30 @@ 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 +599,8 @@ 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

@ -592,10 +609,14 @@ 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>
+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 +632,91 @@ 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>
@ -705,12 +732,136 @@ 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 a bit much for a
+wifi connection either. 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 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>
@ -735,6 +886,8 @@ 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 +903,7 @@ option) any later version.</p>
 </main>
 <footer>
 <p>&copy;
- 2024-01-15
+ 2024-01-22
 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
@ -2,7 +2,7 @@
 title: Weather station
 subtitle: with ModBus RTU interface
 author: M.T. Konstapel
-date: 2024-01-15
+date: 2024-01-22
 website: https://meezenest.nl/mees/
 logo: ./images/mees_logo.svg
 pdf_version: ./weather_station.pdf
@ -16,7 +16,7 @@ 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.

@ -218,7 +218,7 @@ 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 +236,15 @@ 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 +262,7 @@ 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
@ -270,36 +274,119 @@ Below an example of how to read the wind direction in Python using the minimalmo
    wind_direction = instrument.read_register(1, 0, 4)
    print(wind_direction)

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

-The measurements and order of the measurements are the same as for APRS weather reports. But of course we use SI units.
+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       |
-
-^NOTE^ Register 30013 holds the backup temperature reading from the pressure sensor.
-
-| Status bits | Description   | logic 0    | logic 1   |
-|-------------|---------------|------------|-----------|
-| 0           | Heater status | heater off | heater on |
+| 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 13 holds the backup temperature reading from the pressure sensor.
+
+| 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 a bit much for a wifi connection either. 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 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)
@ -329,6 +416,8 @@ 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/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 +27,11 @@
 *    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)
+ *
 **********************************************************************************/
 #include <ModbusSerial.h>
 #include "SparkFun_Weather_Meter_Kit_Arduino_Library.h"
@ -67,9 +72,14 @@ 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 +92,18 @@ 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;
+
 // 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;
@ -97,90 +119,180 @@ 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;

+// State machine implementing smart heater to prevent saturation of the sensor
+char HeaterSi7021 (float humidity)
+{
+  static int state=0;
+  static unsigned long StatemachineTimer=0;
+  bool TempValid=1;
+  bool Heater=0;
+
+  // If Smart heater algorithm is disabled, reset the statemachine forever.
+  // TempValid bit is also forced to 1, but it could be that we just came out of a heater period.
+  // We assume that the client on the other side of the ModBus is smart enough to understand.
+  if ( (MeasuredData.StatusBits & 0x04) == 0)
+    state = 0;
+
+  switch (state)
+  {
+    // Default state: humidity is below 95%
+    case 0:
+      Heater = 0;
+      if (humidity >= 95) {
+        StatemachineTimer = millis();
+        state = 1;
+      }
+      break;
+    // Humidity went above 95%. See if humidity stays above 95% for more than an hour, if so turn on heater
+    case 1:
+      if (humidity >= 95) {
+        if ( (millis() - StatemachineTimer) >= 3.6e+6 ) {
+        //if ( (millis() - StatemachineTimer) >= 300000 ) { // short delay for testing
+          Heater = 1;
+          TempValid = 0;
+          StatemachineTimer = millis();
+          state = 2;
+        } else {
+          Heater = 0;
+        }
+      } else {
+        Heater = 0;
+        state = 0;
+      }      
+      break;
+
+    // Heater is now on, let the sensor cook for 5 minutes
+    case 2:
+      if ( (millis() - StatemachineTimer) >= 300000 ) {
+        StatemachineTimer = millis();
+        Heater = 0;
+        state = 3;
+      } else {
+        Heater = 1;
+      }
+      TempValid = 0;
+      break;
+    // Heater is now off, let the sensor cool for 15 minutes
+    case 3:
+      if ( (millis() - StatemachineTimer) >= 900000 ) {
+        TempValid = 1;            // Sensor cooled, so we can take a valid temperature reading
+        if (humidity >= 95) {
+          // Humidity still above 95%, repeat heating/cooling
+          Heater = 1;
+          StatemachineTimer = millis();
+          state = 2;
+        } else {
+          // Humidity below 95%, reset statemachine
+          Heater = 0;
+          state = 0;
+        }
+      } else {
+        Heater = 0;
+        TempValid = 0;
+      }
+      break;
+
+    default:
+      Heater = 0;
+      state = 0;
+      break;
+  }
+
+  return TempValid<<1 | Heater;
+
+}
 // Read Si7021 sensor and process data
 void ReadSi7021 (void)
 {
-    si7021.triggerMeasurement();
-    si7021.getHumidity(MeasuredData.Humidity);
-    si7021.getTemperature(MeasuredData.Temperature);
+    char result=0x2;
+    float humidity;

-    if (MeasuredData.Humidity>100 || MeasuredData.Humidity<0)
-      MeasuredData.Humidity = 100;
+    si7021.triggerMeasurement();
+    si7021.getHumidity(humidity);

-    //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 (humidity>100 || humidity<0)
+      humidity = 100;
+ 
+    //If humidity is larger than 95% switch on heater to get more acurate measurement and prevent memory offset
+    result = HeaterSi7021(humidity);
+    MeasuredData.StatusBits &= 0xFFFC;  // Reset heater status bits to zero
+    MeasuredData.StatusBits |= result;  // And set the proper bits to one if there are any. The result is we copied the status bits to the register
+
+    // Temperture and humidity readings are valid (as the sensor is not heated)
+    if (result & 0x2) {
+      si7021.getTemperature(MeasuredData.Temperature);
+      // Scale for more decimal positions when converted to integer value for ModBus
+      MeasuredData.Temperature *= 100;
+      //Serial.print(F("Valid temp"));
+
+      si7021.getHumidity(MeasuredData.Humidity);
+      if (MeasuredData.Humidity>100 || MeasuredData.Humidity<0)
+        MeasuredData.Humidity = 100;
+      // Scale for more decimal positions when converted to integer value for ModBus
+      MeasuredData.Humidity *= 100;      
    }
-    if (MeasuredData.Humidity < 94 && MeasuredData.HeaterStatus) {
-      Serial.print(F("Heater off."));
+    // Statemachine thinks it is time to switch on the heater
+    if (result & 0x1) {
+      //Serial.print(F("Heater on."));
+      MeasuredData.HeaterStatus = 1;
+      
+    } else {
+      //Serial.print(F("Heater off."));
      MeasuredData.HeaterStatus = 0;
-      si7021.setHeater(MeasuredData.HeaterStatus);
    }
-    
-    // Scale for more decimal positions when converted to integer value for ModBus
-    MeasuredData.Humidity *= 100;
-    MeasuredData.Temperature *= 100;
+    si7021.setHeater(MeasuredData.HeaterStatus);
+
 }

 // 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;
  
@ -192,11 +304,11 @@ int MaxOfArray (int array[], unsigned int 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;
+  uint32_t tmp_value = 0;
+  uint8_t tmp_length = length;
+  uint16_t average_value = 0;
 
  while (length--)
  {
@ -214,14 +326,15 @@ 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 +392,9 @@ 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
@ -320,13 +436,22 @@ 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 v0.2.2"));
  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/"));
@ -346,6 +471,14 @@ void setup() {
    }
  }

+  // 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 "));
  if (bmp280.initialize())   
@ -425,7 +558,9 @@ 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);
@ -467,11 +602,22 @@ 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	d71e334bd8	build-doc updated with prototype	11 months ago
marcel	e1331d6266	Buffer overflow windspeed fixed	11 months ago
marcel	74175ab241	Removed debug time interval heater	11 months ago
marcel	4d9767edda	Tweaked settings heater algorithm	11 months ago
marcel	e99422412e	Added heather algorithm	11 months ago