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weather_station
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marcel 11 months ago
parent 761ff1c5f3
commit 1fd8e655d4
1 changed files with 87 additions and 14 deletions
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  1. 101
      firmware/weather_station.ino

101
firmware/weather_station.ino
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@ -10,7 +10,7 @@
* BLINK : I2C ERROR
* FLASH : Heartbeat
*
* Copyright (C) 2023 M.T. Konstapel https://meezenest.nl/mees
* Copyright (C) 2023, 2024 M.T. Konstapel https://meezenest.nl/mees
*
* This file is part of weather_station
*
@ -42,6 +42,7 @@ SI7021 si7021;
// Pressure sensor
#include "i2c_BMP280.h"
BMP280 bmp280;
float PRESSURE_OFFSET = 210; // Calibration of BMP280: offset in Pascal
/**************************/
/* Configurable variables */
@ -128,30 +129,33 @@ void ReadSi7021 (void)
si7021.triggerMeasurement();
si7021.getHumidity(MeasuredData.Humidity);
si7021.getTemperature(MeasuredData.Temperature);
// Scale for more decimal positions when converted to integer value for ModBus
MeasuredData.Humidity *= 100;
MeasuredData.Temperature *= 100;
//If humidity is larger than 80% switch on heater to get more acurate measurement
//Switch off when lower than 78% (hysteresis)
if (MeasuredData.Humidity > 80 && !MeasuredData.HeaterStatus) {
if (MeasuredData.Humidity>100 || MeasuredData.Humidity<0)
MeasuredData.Humidity = 100;
//If humidity is larger than 96% switch on heater to get more acurate measurement and prevent memory offset
//Switch off when lower than 94% (hysteresis)
if (MeasuredData.Humidity > 96 && !MeasuredData.HeaterStatus) {
Serial.print(F("Heater on."));
MeasuredData.HeaterStatus = 1;
si7021.setHeater(MeasuredData.HeaterStatus);
}
if (MeasuredData.Humidity < 78 && MeasuredData.HeaterStatus) {
if (MeasuredData.Humidity < 94 && MeasuredData.HeaterStatus) {
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;
}
// Read BMP280
void ReadBMP280 (void)
{
MeasuredData.Pressure=0;
/*
// MeasuredData.Pressure=0;
bmp280.awaitMeasurement();
float temperature;
@ -160,10 +164,20 @@ void ReadBMP280 (void)
float pascal;
bmp280.getPressure(pascal);
pascal = (pascal - PRESSURE_OFFSET) / 10; // Convert to hPa
MeasuredData.Pressure = pascal;
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)
@ -329,7 +343,7 @@ void setup() {
}
}
/* // Initialize BMP280 pressure sensor
// Initialize BMP280 pressure sensor
Serial.print(F("Pressure sensor BMP280 "));
if (bmp280.initialize())
Serial.println(F("found"));
@ -347,7 +361,7 @@ void setup() {
// onetime-measure:
bmp280.setEnabled(0);
bmp280.triggerMeasurement();
*/
// Expected ADC values have been defined for various platforms in the
// library, however your platform may not be included. This code will check
// if that's the case
@ -358,6 +372,61 @@ void setup() {
// resolution, so you'll need to specify it here:
weatherMeterKit.setADCResolutionBits(10);
#endif
// Here we create a struct to hold all the calibration parameters
SFEWeatherMeterKitCalibrationParams calibrationParams = weatherMeterKit.getCalibrationParams();
// The wind vane has 8 switches, but 2 could close at the same time, which
// results in 16 possible positions. Each position has a resistor connected
// to GND, so this library assumes a voltage divider is created by adding
// another resistor to VCC. Some of the wind vane resistor values are
// fairly close to each other, meaning an accurate ADC is required. However
// some ADCs have a non-linear behavior that causes this measurement to be
// inaccurate. To account for this, the vane resistor values can be manually
// changed here to compensate for the non-linear behavior of the ADC
calibrationParams.vaneADCValues[WMK_ANGLE_0_0] = 943;
calibrationParams.vaneADCValues[WMK_ANGLE_22_5] = 828;
calibrationParams.vaneADCValues[WMK_ANGLE_45_0] = 885;
calibrationParams.vaneADCValues[WMK_ANGLE_67_5] = 702;
calibrationParams.vaneADCValues[WMK_ANGLE_90_0] = 785;
calibrationParams.vaneADCValues[WMK_ANGLE_112_5] = 404;
calibrationParams.vaneADCValues[WMK_ANGLE_135_0] = 460;
calibrationParams.vaneADCValues[WMK_ANGLE_157_5] = 82;
calibrationParams.vaneADCValues[WMK_ANGLE_180_0] = 91;
calibrationParams.vaneADCValues[WMK_ANGLE_202_5] = 64;
calibrationParams.vaneADCValues[WMK_ANGLE_225_0] = 185;
calibrationParams.vaneADCValues[WMK_ANGLE_247_5] = 125;
calibrationParams.vaneADCValues[WMK_ANGLE_270_0] = 285;
calibrationParams.vaneADCValues[WMK_ANGLE_292_5] = 242;
calibrationParams.vaneADCValues[WMK_ANGLE_315_0] = 628;
calibrationParams.vaneADCValues[WMK_ANGLE_337_5] = 598;
// The rainfall detector contains a small cup that collects rain water. When
// the cup fills, the water is dumped and the total rainfall is incremented
// by some value. This value defaults to 0.2794mm of rain per count, as
// specified by the datasheet
calibrationParams.mmPerRainfallCount = 0.2794;
// The rainfall detector switch can sometimes bounce, causing multiple extra
// triggers. This input is debounced by ignoring extra triggers within a
// time window, which defaults to 100ms
calibrationParams.minMillisPerRainfall = 100;
// The anemometer contains a switch that opens and closes as it spins. The
// rate at which the switch closes depends on the wind speed. The datasheet
// states that a wind of 2.4kph causes the switch to close once per second
calibrationParams.kphPerCountPerSec = 2.4;
// Because the anemometer generates discrete pulses as it rotates, it's not
// possible to measure the wind speed exactly at any point in time. A filter
// 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;
// Now we can set all the calibration parameters at once
weatherMeterKit.setCalibrationParams(calibrationParams);
// Begin weather meter kit
weatherMeterKit.begin();
@ -396,6 +465,10 @@ void loop() {
mb.Ireg (SensorHumidityIreg, MeasuredData.Humidity);
mb.Ireg (SensorPressureIreg, MeasuredData.Pressure);
// Debug wind vane
//Serial.print(F("\n Measured ADC: "));
//Serial.print(analogRead(windDirectionPin));
digitalWrite(LED_BUILTIN, LOW); // LED as heartbeat

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