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5 Commits

  1. 25
      CHANGELOG.md
  2. 264
      build-doc/images/block_diagram.svg.2024_01_15_13_59_05.0.svg
  3. 284
      build-doc/images/block_diagram.svg.2024_01_15_14_00_17.0.svg
  4. 295
      build-doc/images/block_diagram.svg.2024_01_15_14_00_56.0.svg
  5. 955
      build-doc/images/diagram_rain_meter.svg.2024_01_15_08_59_56.0.svg
  6. 441
      build-doc/images/prototype_block_diagram.svg
  7. BIN
      build-doc/images/prototype_inside.jpg
  8. BIN
      build-doc/images/prototype_inside_annotations.jpg
  9. BIN
      build-doc/images/prototype_inside_annotations_small.jpg
  10. BIN
      build-doc/images/prototype_inside_small.jpg
  11. BIN
      build-doc/images/prototype_overview.jpg
  12. BIN
      build-doc/images/prototype_overview_small.jpg
  13. BIN
      build-doc/images/prototype_sensors.jpg
  14. BIN
      build-doc/images/prototype_sensors_small.jpg
  15. BIN
      build-doc/images/smart_heater.odg
  16. 1258
      build-doc/images/smart_heater.svg
  17. 212
      build-doc/images/wind_speed_diagram.svg
  18. 245
      build-doc/weather_station.html
  19. 149
      build-doc/weather_station.md
  20. BIN
      build-doc/weather_station.pdf
  21. BIN
      datasheet/Handboek_H05_knmi_definities.pdf
  22. 266
      firmware/weather_station.ino
  23. BIN
      test_software/__pycache__/epever_control.cpython-36.pyc
  24. 26
      test_software/epever_control.py
  25. 6
      test_software/weather_station_rs485_client.py

@ -26,3 +26,28 @@ All notable changes to this project will be documented in this file.
### Changed ### 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. - 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)]

@ -1,264 +0,0 @@
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<li><a href="#theory-of-operation---software" <li><a href="#theory-of-operation---software"
id="toc-theory-of-operation---software">Theory of operation id="toc-theory-of-operation---software">Theory of operation
- Software</a></li> - 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" <li><a href="#schematic"
id="toc-schematic">Schematic</a></li> id="toc-schematic">Schematic</a></li>
<li><a href="#software-dependencies" <li><a href="#software-dependencies"
@ -71,7 +75,7 @@
<h1 class="title">Weather station</h1> <h1 class="title">Weather station</h1>
<p class="subtitle">with ModBus RTU interface</p> <p class="subtitle">with ModBus RTU interface</p>
<p class="author">M.T. Konstapel</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> <p><a href="./weather_station.pdf"><i>PDF version</i></a></p>
</header> </header>
<main> <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 was measuring the temperature and rainfall on a daily basis. My
grandfather had an allotment, so he also was very interested in the 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 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 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 he talked to someone he always started the conversation by talking about
the weather. And when I open a new browser window, it automatically 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 of the micro-controller. Every time its logic level changes an interrupt
routine is called. This routine increments a counter and checks how many routine is called. This routine increments a counter and checks how many
time has passed since the previous interrupt call. If the previous call 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 was more than 6 seconds ago, the wind speed is (almost) zero. If the
previous call was just over a second ago the interrupt counter now holds previous call was just over 3 second ago the interrupt counter now holds
the amount of pulses in one second. This value is stored and from that the amount of pulses in three seconds. This value is stored and from
value the wind speed can be calculated. If the previous call was under a that value the wind speed can be calculated. If the previous call was
second ago the measurement is still in progress and no further action is less than 3 seconds ago the measurement is still in progress and no
taken.</p> 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> <figure>
<img src="./images/wind_speed_diagram.svg" title="Wind speed interrupt" <img src="./images/wind_speed_diagram.svg" title="Wind speed interrupt"
alt="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 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 weather types. The sensor has a build in heater to drive of moisture and
thus preventing this problem. Because the temperature of the sensor thus preventing this problem. Because the temperature of the sensor
rises when the heater is turned on, accurate ambient temperature rises when the heater is turned on, accurate ambient temperature and
readings are no longer possible. But with a smart algorithm it is humidity readings are no longer possible. But with a smart algorithm it
possible to get the benefits of the build in heater while still being is possible to get the benefits of the build in heater while still being
able to use the sensor as an ambient thermometer.</p> able to use the sensor as an ambient thermometer.</p>
<p>When the humidity rises above 95% for more than an hour the current <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 temperature and humidity are stored and the heater is switched on for 5
the heater is switched off again. If after 10 minutes the humidity is minutes. Than the heater is switched off again. If after 15 minutes the
still above 95% the heater is turned on again for another 10 minutes. humidity is still above 95% the heater is turned on again for another 5
But not before the temperature is measured and stored, as the sensor is minutes. But not before the temperature and humidity are measured and
now cooled off to ambient temperature. If the humidity is below 95% the stored, as the sensor is now cooled off to ambient temperature. If the
sensor is free from moisture and the process is not repeated for another humidity is below 95% the sensor is free from moisture and the process
hour.</p> is not repeated for another hour.</p>
<p>Flow chart under development.</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> <h2 id="temperature-1">Temperature</h2>
<p>The temperature is read from the humidity sensor as this sensor gives <p>The temperature is read from the humidity sensor as this sensor gives
the most accurate temperature readings. When the heater is on (see 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 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 are available in the input registers and can be read via function code
04.</p> 04.</p>
<p>Below an example of how to read the wind direction in Python using <p>Below an example of how to read the wind direction and enable the
the minimalmodbus library.</p> heater algorithm in Python using the minimalmodbus library.</p>
<pre><code>#!/usr/bin/env python3 <pre><code>#!/usr/bin/env python3
import minimalmodbus import minimalmodbus
@ -592,10 +609,14 @@ instrument = minimalmodbus.Instrument(&#39;/dev/ttyUSB1&#39;, 14)
# register number, number of decimals, function code # register number, number of decimals, function code
wind_direction = instrument.read_register(1, 0, 4) wind_direction = instrument.read_register(1, 0, 4)
print(wind_direction)</code></pre> print(wind_direction)
<h3 id="input-registers">Input registers</h3>
<p>The measurements and order of the measurements are the same as for # register address, value, function code
APRS weather reports. But of course we use SI units.</p> 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> <table>
<colgroup> <colgroup>
<col style="width: 13%" /> <col style="width: 13%" />
@ -611,85 +632,91 @@ APRS weather reports. But of course we use SI units.</p>
</thead> </thead>
<tbody> <tbody>
<tr class="odd"> <tr class="odd">
<td>30000</td> <td>00</td>
<td>Device ID (0x5758)</td> <td>Device ID (0x5758)</td>
<td>NO UNIT</td> <td>NO UNIT</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30001</td> <td>01</td>
<td>Wind direction</td> <td>Wind direction</td>
<td>degrees</td> <td>degrees * 10</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30002</td> <td>02</td>
<td>Wind speed (average of 10 minutes)</td> <td>Wind speed (average of 10 minutes)</td>
<td>m/s * 100</td> <td>m/s * 100</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30003</td> <td>03</td>
<td>Wind gust (peak of last 10 minutes)</td> <td>Wind gust (peak of last 10 minutes)</td>
<td>m/s * 100</td> <td>m/s * 100</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30004</td> <td>04</td>
<td>Temperature (two’s complement)</td> <td>Temperature (two’s complement)</td>
<td>degrees Celcius * 100</td> <td>degrees Celcius * 100</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30005</td> <td>05</td>
<td>Rain last hour</td> <td>Rain last hour</td>
<td>l/m2 * 100</td> <td>l/m2 * 100</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30006</td> <td>06</td>
<td>Rain last 24 hours</td> <td>Rain last 24 hours</td>
<td>l/m2 * 100</td> <td>l/m2 * 100</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30007</td> <td>07</td>
<td>Rain since midnight</td> <td>Rain since midnight</td>
<td>NOT IMPLEMENTED</td> <td>NOT IMPLEMENTED</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30008</td> <td>08</td>
<td>Humidity</td> <td>Humidity</td>
<td>percent * 100</td> <td>percent * 100</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30009</td> <td>09</td>
<td>Barometric pressure</td> <td>Barometric pressure</td>
<td>hPa * 10</td> <td>hPa * 10</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30010</td> <td>10</td>
<td>Luminosity</td> <td>Luminosity</td>
<td>W/m2</td> <td>W/m2</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30011</td> <td>11</td>
<td>Snow fall</td> <td>Snow fall</td>
<td>NOT IMPLEMENTED</td> <td>NOT IMPLEMENTED</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30012</td> <td>12</td>
<td>Raw rain counter</td> <td>Raw rain counter</td>
<td>NOT IMPLEMENTED</td> <td>l/m2 * 100</td>
</tr> </tr>
<tr class="even"> <tr class="even">
<td>30013</td> <td>13</td>
<td>Temperature (two’s complement)</td> <td>Temperature (two’s complement)</td>
<td>degrees Celcius * 100</td> <td>degrees Celcius * 100</td>
</tr> </tr>
<tr class="odd"> <tr class="odd">
<td>30014</td> <td>14</td>
<td>Status bits</td> <td>Status bits</td>
<td>see table below</td> <td>see table below</td>
</tr> </tr>
</tbody> </tbody>
</table> </table>
<p><sup>NOTE</sup> Register 30013 holds the backup temperature reading <p><sup>NOTE</sup> Register 13 holds the backup temperature reading from
from the pressure sensor.</p> the pressure sensor.</p>
<table> <table>
<colgroup>
<col style="width: 18%" />
<col style="width: 31%" />
<col style="width: 25%" />
<col style="width: 24%" />
</colgroup>
<thead> <thead>
<tr class="header"> <tr class="header">
<th>Status bits</th> <th>Status bits</th>
@ -705,12 +732,136 @@ from the pressure sensor.</p>
<td>heater off</td> <td>heater off</td>
<td>heater on</td> <td>heater on</td>
</tr> </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> </tbody>
</table> </table>
<p>The ModBus registers are 16 bit wide. For better precision, some <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 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 two decimal points can be stored as 16 bit integer values. Just divide
by 10 or 100 to get the floating point values.</p> 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> <h1 id="schematic">Schematic</h1>
<p><a href="./images/weather_station_schematic.pdf"><img <p><a href="./images/weather_station_schematic.pdf"><img
src="./images/weather_station_schematic.svg" alt="Schematic" /></a></p> 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> <p>Libraries are included with the source code of this project</p>
<h1 id="license">License</h1> <h1 id="license">License</h1>
<p>Copyright (C) 2023, 2024 M.T. Konstapel</p> <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 <p>The software is published as open-source software (GPL). The hardware
is published as open-source hardware (OSH).</p> is published as open-source hardware (OSH).</p>
<h2 id="software">Software</h2> <h2 id="software">Software</h2>
@ -750,7 +903,7 @@ option) any later version.</p>
</main> </main>
<footer> <footer>
<p>&copy; <p>&copy;
2024-01-15 2024-01-22
M.T. Konstapel M.T. Konstapel
<a href="https://meezenest.nl/mees/">https://meezenest.nl/mees/</a> <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><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>.

@ -2,7 +2,7 @@
title: Weather station title: Weather station
subtitle: with ModBus RTU interface subtitle: with ModBus RTU interface
author: M.T. Konstapel author: M.T. Konstapel
date: 2024-01-15 date: 2024-01-22
website: https://meezenest.nl/mees/ website: https://meezenest.nl/mees/
logo: ./images/mees_logo.svg logo: ./images/mees_logo.svg
pdf_version: ./weather_station.pdf pdf_version: ./weather_station.pdf
@ -16,7 +16,7 @@ abstract: >
# Why do you need a weather station? # 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. 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 ## 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") ![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 ## 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 ## 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. 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 #!/usr/bin/env python3
import minimalmodbus 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) wind_direction = instrument.read_register(1, 0, 4)
print(wind_direction) 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 | | Address | Description | Units |
|---------|-------------------------------------|-----------------------| |---------|-------------------------------------|-----------------------|
| 30000 | Device ID (0x5758) | NO UNIT | | 00 | Device ID (0x5758) | NO UNIT |
| 30001 | Wind direction | degrees | | 01 | Wind direction | degrees * 10 |
| 30002 | Wind speed (average of 10 minutes) | m/s * 100 | | 02 | Wind speed (average of 10 minutes) | m/s * 100 |
| 30003 | Wind gust (peak of last 10 minutes) | m/s * 100 | | 03 | Wind gust (peak of last 10 minutes) | m/s * 100 |
| 30004 | Temperature (two's complement) | degrees Celcius * 100 | | 04 | Temperature (two's complement) | degrees Celcius * 100 |
| 30005 | Rain last hour | l/m2 * 100 | | 05 | Rain last hour | l/m2 * 100 |
| 30006 | Rain last 24 hours | l/m2 * 100 | | 06 | Rain last 24 hours | l/m2 * 100 |
| 30007 | Rain since midnight | NOT IMPLEMENTED | | 07 | Rain since midnight | NOT IMPLEMENTED |
| 30008 | Humidity | percent * 100 | | 08 | Humidity | percent * 100 |
| 30009 | Barometric pressure | hPa * 10 | | 09 | Barometric pressure | hPa * 10 |
| 30010 | Luminosity | W/m2 | | 10 | Luminosity | W/m2 |
| 30011 | Snow fall | NOT IMPLEMENTED | | 11 | Snow fall | NOT IMPLEMENTED |
| 30012 | Raw rain counter | NOT IMPLEMENTED | | 12 | Raw rain counter | l/m2 * 100 |
| 30013 | Temperature (two's complement) | degrees Celcius * 100 | | 13 | Temperature (two's complement) | degrees Celcius * 100 |
| 30014 | Status bits | see table below | | 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 | | Status bits | Description | logic 0 | logic 1 |
|-------------|---------------|------------|-----------| |-------------|----------------------|------------------|-----------------|
| 0 | Heater status | heater off | heater on | | 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. 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
[![Schematic](./images/weather_station_schematic.svg)](./images/weather_station_schematic.pdf) [![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 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). The software is published as open-source software (GPL). The hardware is published as open-source hardware (OSH).
## Software ## Software

Binary file not shown.

@ -27,6 +27,11 @@
* You should have received a copy of the GNU General Public License * You should have received a copy of the GNU General Public License
* along with weather_station. If not, see <https://www.gnu.org/licenses/>. * 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 <ModbusSerial.h>
#include "SparkFun_Weather_Meter_Kit_Arduino_Library.h" #include "SparkFun_Weather_Meter_Kit_Arduino_Library.h"
@ -67,9 +72,14 @@ const byte SlaveId = 14;
* 30004: Temperature (degrees Celcius) * 30004: Temperature (degrees Celcius)
* 30005: Rain last hour (l/m2) * 30005: Rain last hour (l/m2)
* 30006: Rain last 24 hours (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) * 30008: Humidity (percent)
* 30009: Barometric pressure (hPa) * 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; const int SensorIDIreg = 0;
@ -82,6 +92,18 @@ const int SensorRainLast24Ireg = 6;
const int SensorRainSinceMidnightIreg = 7; const int SensorRainSinceMidnightIreg = 7;
const int SensorHumidityIreg = 8; const int SensorHumidityIreg = 8;
const int SensorPressureIreg = 9; 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 // RS-485 serial port
#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available #define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
const unsigned long Baudrate = 9600; const unsigned long Baudrate = 9600;
@ -97,90 +119,180 @@ ModbusSerial mb (MySerial, SlaveId, TxenPin);
unsigned long ts; unsigned long ts;
unsigned long HourTimer; unsigned long HourTimer;
int WindGustData1[30]; uint16_t WindGustData1[30];
unsigned char WindGustData1Counter=0; uint8_t WindGustData1Counter=0;
int WindGustData2[10]; uint16_t WindGustData2[10];
unsigned char WindGustData2Counter=0; uint8_t WindGustData2Counter=0;
int WindAverageData1[30]; uint16_t WindAverageData1[30];
unsigned char WindAverageData1Counter=0; uint8_t WindAverageData1Counter=0;
int WindAverageData2[10]; uint16_t WindAverageData2[10];
unsigned char WindAverageData2Counter=0; uint8_t WindAverageData2Counter=0;
int RainPerHour[24]; uint16_t RainPerHour[24];
unsigned char RainPerHourCounter=0; uint8_t RainPerHourCounter=0;
struct MeasuredData { struct MeasuredData {
int WindDirection; uint16_t WindDirection;
int WindSpeed; uint16_t WindSpeed;
int WindGust; uint16_t WindGust;
int Rain; uint16_t Rain;
int RainLast24; uint16_t RainLast24;
int SensorRainSinceMidnight; uint16_t SensorRainSinceMidnight;
int Pressure; uint16_t Pressure;
uint16_t Luminosity;
uint16_t StatusBits = 0;
uint16_t RainfallCounter = 0;
float Temperature; float Temperature;
float Humidity; float Humidity;
float TemperatureBackup;
bool HeaterStatus = 0; bool HeaterStatus = 0;
} MeasuredData; } 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 // Read Si7021 sensor and process data
void ReadSi7021 (void) void ReadSi7021 (void)
{ {
si7021.triggerMeasurement(); char result=0x2;
si7021.getHumidity(MeasuredData.Humidity); float humidity;
si7021.getTemperature(MeasuredData.Temperature);
if (MeasuredData.Humidity>100 || MeasuredData.Humidity<0) si7021.triggerMeasurement();
MeasuredData.Humidity = 100; si7021.getHumidity(humidity);
//If humidity is larger than 96% switch on heater to get more acurate measurement and prevent memory offset if (humidity>100 || humidity<0)
//Switch off when lower than 94% (hysteresis) humidity = 100;
if (MeasuredData.Humidity > 96 && !MeasuredData.HeaterStatus) {
Serial.print(F("Heater on.")); //If humidity is larger than 95% switch on heater to get more acurate measurement and prevent memory offset
MeasuredData.HeaterStatus = 1; result = HeaterSi7021(humidity);
si7021.setHeater(MeasuredData.HeaterStatus); 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) { // Statemachine thinks it is time to switch on the heater
Serial.print(F("Heater off.")); if (result & 0x1) {
//Serial.print(F("Heater on."));
MeasuredData.HeaterStatus = 1;
} else {
//Serial.print(F("Heater off."));
MeasuredData.HeaterStatus = 0; MeasuredData.HeaterStatus = 0;
si7021.setHeater(MeasuredData.HeaterStatus);
} }
si7021.setHeater(MeasuredData.HeaterStatus);
// Scale for more decimal positions when converted to integer value for ModBus
MeasuredData.Humidity *= 100;
MeasuredData.Temperature *= 100;
} }
// Read BMP280 // Read BMP280
void ReadBMP280 (void) void ReadBMP280 (void)
{ {
// MeasuredData.Pressure=0;
bmp280.awaitMeasurement(); bmp280.awaitMeasurement();
float temperature;
bmp280.getTemperature(temperature);
float pascal; float pascal;
bmp280.getPressure(pascal); bmp280.getPressure(pascal);
pascal = (pascal - PRESSURE_OFFSET) / 10; // Convert to hPa pascal = (pascal - PRESSURE_OFFSET) / 10; // Convert to hPa
MeasuredData.Pressure = pascal; MeasuredData.Pressure = pascal;
bmp280.getTemperature(MeasuredData.TemperatureBackup);
// Scale for more decimal positions when converted to integer value for ModBus
MeasuredData.TemperatureBackup *= 100;
bmp280.triggerMeasurement(); 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; int maximum_value = 0;
@ -192,11 +304,11 @@ int MaxOfArray (int array[], unsigned int length)
return maximum_value; return maximum_value;
} }
int AverageOfArray (int array[], unsigned int length) uint16_t AverageOfArray (uint16_t array[], uint16_t length)
{ {
int tmp_value = 0; uint32_t tmp_value = 0;
unsigned char tmp_length = length; uint8_t tmp_length = length;
int average_value = 0; uint16_t average_value = 0;
while (length--) while (length--)
{ {
@ -214,14 +326,15 @@ void ReadSparkfunWeatherStation (void)
float tmpRegister; 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 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; MeasuredData.WindSpeed = tmpRegister;
tmpRegister = 100*weatherMeterKit.getTotalRainfall(); // Use float for conversion to l/m2 times 100, than put it in integer register for ModBus tmpRegister = 100*weatherMeterKit.getTotalRainfall(); // Use float for conversion to l/m2 times 100, than put it in integer register for ModBus
MeasuredData.Rain = tmpRegister; MeasuredData.Rain = tmpRegister;
// FIFO for calculating wind gust of last 10 minutes // 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. // 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. // 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. // 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; RainPerHourCounter=0;
} }
RainPerHour[RainPerHourCounter] = MeasuredData.Rain; 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(); weatherMeterKit.resetTotalRainfall();
// Calculate rain fall in the last 24 hours // Calculate rain fall in the last 24 hours
@ -320,13 +436,22 @@ void setup() {
mb.addIreg (SensorRainSinceMidnightIreg); mb.addIreg (SensorRainSinceMidnightIreg);
mb.addIreg (SensorHumidityIreg); mb.addIreg (SensorHumidityIreg);
mb.addIreg (SensorPressureIreg); 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 // Set Weather station ID
mb.Ireg (SensorIDIreg, 0x5758); mb.Ireg (SensorIDIreg, 0x5758);
// Set unused register to zero // Set unused register to zero
mb.Ireg (SensorRainSinceMidnightIreg, 0); 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("(C)2024 M.T. Konstapel"));
Serial.println(F("This project is free and open source")); Serial.println(F("This project is free and open source"));
Serial.println(F("More details: https://meezenest.nl/mees/")); 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 // Initialize BMP280 pressure sensor
Serial.print(F("Pressure sensor BMP280 ")); Serial.print(F("Pressure sensor BMP280 "));
if (bmp280.initialize()) if (bmp280.initialize())
@ -425,7 +558,9 @@ void setup() {
// is implemented in the library that averages the wind speed over a certain // 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 // time period, which defaults to 1 second. Longer intervals result in more
// accurate measurements, but cause delay in the measurement // 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 // Now we can set all the calibration parameters at once
weatherMeterKit.setCalibrationParams(calibrationParams); weatherMeterKit.setCalibrationParams(calibrationParams);
@ -467,11 +602,22 @@ void loop() {
mb.Ireg (SensorTemperatureIreg, MeasuredData.Temperature); mb.Ireg (SensorTemperatureIreg, MeasuredData.Temperature);
mb.Ireg (SensorHumidityIreg, MeasuredData.Humidity); mb.Ireg (SensorHumidityIreg, MeasuredData.Humidity);
mb.Ireg (SensorPressureIreg, MeasuredData.Pressure); 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 // Debug wind vane
//Serial.print(F("\n Measured ADC: ")); //Serial.print(F("\n Measured ADC: "));
//Serial.print(analogRead(windDirectionPin)); //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 digitalWrite(LED_BUILTIN, LOW); // LED as heartbeat

@ -43,15 +43,19 @@ class EpeverChargeController(minimalmodbus.Instrument):
@retry(wait_fixed=200, stop_max_attempt_number=5) @retry(wait_fixed=200, stop_max_attempt_number=5)
def retriable_read_register( def retriable_read_register(
self, registeraddress, number_of_decimals, functioncode self, registeraddress, number_of_decimals, functioncode, signed=False
): ):
return self.read_register( 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) @retry(wait_fixed=200, stop_max_attempt_number=5)
def retriable_read_bit(self, registeraddress, functioncode): def retriable_read_bit(self, registeraddress, functioncode):
return self.read_bit(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 #Address range 0x3000
def get_id(self): def get_id(self):
@ -60,7 +64,7 @@ class EpeverChargeController(minimalmodbus.Instrument):
def get_wind_direction(self): def get_wind_direction(self):
"""PV array rated current""" """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): def get_wind_speedl(self):
"""PV array rated power (low 16 bits)""" """PV array rated power (low 16 bits)"""
@ -72,7 +76,7 @@ class EpeverChargeController(minimalmodbus.Instrument):
def get_temperature(self): def get_temperature(self):
"""Rated Battery's voltage""" """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): def get_rain(self):
"""Rated charging current to battery""" """Rated charging current to battery"""
@ -93,3 +97,17 @@ class EpeverChargeController(minimalmodbus.Instrument):
def get_pressure(self): def get_pressure(self):
"""Charging mode: 0x0001 = PWM""" """Charging mode: 0x0001 = PWM"""
return self.retriable_read_register(9, 1, 4) 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)

@ -594,7 +594,9 @@ elif dump_file:
dump_all_registers() dump_all_registers()
else: else:
status = 1
print("Enable heater function")
controller.enable_heater()
while (1): while (1):
time.sleep(3) # Sleep for 3 seconds time.sleep(3) # Sleep for 3 seconds
print ("Retrieving all known registers.") print ("Retrieving all known registers.")
@ -608,6 +610,8 @@ else:
rawdat['Temperature'] = controller.get_temperature() rawdat['Temperature'] = controller.get_temperature()
rawdat['Humidity'] = controller.get_humidity() rawdat['Humidity'] = controller.get_humidity()
rawdat['Pressure'] = controller.get_pressure() 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)) print (json.dumps(rawdat, indent=1, sort_keys=False))

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