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541 lines
19 KiB
541 lines
19 KiB
/*********************************************************************************
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*
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* weather_station is a weatherstation build around the SparkFun weather meter
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* It can measure wind speed, wind gust , wind direction, rain fall, temperature,
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* humidity and air pressure and has an RS-485 ModBus interface for your convenience.
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*
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* LED on Arduino gives status:
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*
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* ON : Booting
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* BLINK : I2C ERROR
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* FLASH : Heartbeat
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*
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* Copyright (C) 2023, 2024 M.T. Konstapel https://meezenest.nl/mees
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*
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* This file is part of weather_station
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*
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* weather_station is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* weather_station is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with weather_station. If not, see <https://www.gnu.org/licenses/>.
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*
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* 2023-01-21: - Buffer overflow when calculating average wind speed in AverageOfArray()
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* Fix: use 32 bit register for average_value.
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* - Changed some variables to the propper standard (uint8_t, uint16_t, etc.)
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* - SparkFun wind interrupt now calculates over 3 seconds in stead of 1 second (KNMI standard)
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*
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* 2-24-05-02: - Removed cope for si7021
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* - Added code for HYT221 humidity sensor
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*
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* See CHANGELOG.md
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*
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**********************************************************************************/
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#include <ModbusSerial.h>
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#include "SparkFun_Weather_Meter_Kit_Arduino_Library.h"
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//I2C
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#include <Wire.h>
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#include "i2c.h"
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//Temperature and humidity sensor
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#define HYT_ADDR 0x28 // I2C address of the HYT 221, 271, 371 and most likely the rest of the family
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// Pressure sensor
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#include "i2c_BMP280.h"
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BMP280 bmp280;
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float PRESSURE_OFFSET = 210; // Calibration of BMP280: offset in Pascal
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/**************************/
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/* Configurable variables */
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/**************************/
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// Sparkfun weather station
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int windDirectionPin = A0;
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int windSpeedPin = 2;
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int rainfallPin = 3;
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// RS485 driver
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#define RS485_RE 11 // Tight to RS485_DE and must be configured as an input to prevent a short circuit
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#define RS485_DE 12
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// Used Pins
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const int TxenPin = RS485_DE; // -1 disables the feature, change that if you are using an RS485 driver, this pin would be connected to the DE and /RE pins of the driver.
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// ModBus address
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const byte SlaveId = 14;
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/* Modbus Registers Offsets (0-9999)
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*
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* 30000: Weater station ID (0x5758)
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* 30001: Wind direction (degrees)
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* 30002: Wind speed (average over 10 minutes in km/h)
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* 30003: Wind gust (peak wind speed in the last 10 minutes in km/h)
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* 30004: Temperature (degrees Celcius)
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* 30005: Rain last hour (l/m2)
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* 30006: Rain last 24 hours (l/m2)
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* 30007: Rain since midnight (l/m2) [NOT IMPLEMENTED, always 0]
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* 30008: Humidity (percent)
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* 30009: Barometric pressure (hPa)
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* 30010: Luminosity (W/m2)
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* 30011: Snow fall [NOT IMPLEMENTED, always 0]
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* 30012: Raw rainfall counter (mm)
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* 30013: Temperature pressure sensor (degrees Celsius)
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* 30014: Status bits 0=heater, 1-15: reserved
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*
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*/
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const int SensorIDIreg = 0;
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const int SensorWindDirectionIreg = 1;
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const int SensorWindSpeedIreg = 2;
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const int SensorWindGustIreg = 3;
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const int SensorTemperatureIreg = 4;
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const int SensorRainIreg = 5;
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const int SensorRainLast24Ireg = 6;
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const int SensorRainSinceMidnightIreg = 7;
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const int SensorHumidityIreg = 8;
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const int SensorPressureIreg = 9;
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const int SensorLuminosityIreg = 10;
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const int SensorSnowFallIreg = 11;
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const int SensorRainfallRawIreg = 12;
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const int SensorTemperatureBackupIreg = 13;
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const int SensorStatusBitsIreg = 14;
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/* Modbus Registers Offsets (0-9999)
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* Coils
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* 0 = Heater algorithm (0 = disable, 1 = enable)
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*/
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const int HeaterCoil = 0;
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float HUMIDITY_THRESHOLD = 92.0;
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// RS-485 serial port
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#define MySerial Serial // define serial port used, Serial most of the time, or Serial1, Serial2 ... if available
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const unsigned long Baudrate = 9600;
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/******************************/
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/* END Configurable variables */
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/******************************/
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// Create an instance of the weather meter kit
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SFEWeatherMeterKit weatherMeterKit(windDirectionPin, windSpeedPin, rainfallPin);
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// ModbusSerial object
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ModbusSerial mb (MySerial, SlaveId, TxenPin);
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unsigned long ts;
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unsigned long HourTimer;
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uint16_t WindGustData1[30];
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uint8_t WindGustData1Counter=0;
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uint16_t WindGustData2[10];
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uint8_t WindGustData2Counter=0;
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uint16_t WindAverageData1[30];
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uint8_t WindAverageData1Counter=0;
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uint16_t WindAverageData2[10];
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uint8_t WindAverageData2Counter=0;
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uint16_t RainPerHour[24];
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uint8_t RainPerHourCounter=0;
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struct MeasuredData {
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uint16_t WindDirection;
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uint16_t WindSpeed;
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uint16_t WindGust;
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uint16_t Rain;
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uint16_t RainLast24;
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uint16_t SensorRainSinceMidnight;
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uint16_t Pressure;
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uint16_t Luminosity;
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uint16_t StatusBits = 0;
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uint16_t RainfallCounter = 0;
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float Temperature;
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float Humidity;
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float TemperatureBackup;
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bool HeaterStatus = 0;
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} MeasuredData;
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void ReadHYT221 (void)
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{
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double humidity;
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double temperature;
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Wire.beginTransmission(HYT_ADDR); // Begin transmission with given device on I2C bus
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Wire.requestFrom(HYT_ADDR, 4); // Request 4 bytes
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// Read the bytes if they are available
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// The first two bytes are humidity the last two are temperature
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if(Wire.available() == 4) {
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int b1 = Wire.read();
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int b2 = Wire.read();
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int b3 = Wire.read();
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int b4 = Wire.read();
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Wire.endTransmission(); // End transmission and release I2C bus
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// combine humidity bytes and calculate humidity
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int rawHumidity = b1 << 8 | b2;
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// compound bitwise to get 14 bit measurement first two bits
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// are status/stall bit (see intro text)
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rawHumidity = (rawHumidity &= 0x3FFF);
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humidity = 100.0 / pow(2,14) * rawHumidity;
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// Scale for more decimal positions when converted to integer value for ModBus
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MeasuredData.Humidity = 100 * humidity;
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// combine temperature bytes and calculate temperature
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b4 = (b4 >> 2); // Mask away 2 least significant bits see HYT 221 doc
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int rawTemperature = b3 << 6 | b4;
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temperature = 165.0 / pow(2,14) * rawTemperature - 40;
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// Scale for more decimal positions when converted to integer value for ModBus
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MeasuredData.Temperature = 100 * temperature;
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//Serial.print(MeasuredData.Humidity);
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//Serial.print("% - Temperature: ");
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//Serial.println(MeasuredData.Temperature);
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}
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else {
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Serial.println("Not enough bytes available on wire.");
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}
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}
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// Read BMP280
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void ReadBMP280 (void)
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{
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bmp280.awaitMeasurement();
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float pascal;
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bmp280.getPressure(pascal);
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pascal = (pascal - PRESSURE_OFFSET) / 10; // Convert to hPa
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MeasuredData.Pressure = pascal;
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bmp280.getTemperature(MeasuredData.TemperatureBackup);
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// Scale for more decimal positions when converted to integer value for ModBus
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MeasuredData.TemperatureBackup *= 100;
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bmp280.triggerMeasurement();
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}
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int MaxOfArray (int array[], uint16_t length)
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{
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int maximum_value = 0;
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while (length)
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{
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// decrement length, because 0/1 problem: if lenght = n, than last position off array is n-1
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length--;
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if (array[length] > maximum_value)
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maximum_value = array[length];
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}
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return maximum_value;
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}
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uint16_t AverageOfArray (uint16_t array[], uint16_t length)
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{
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uint32_t tmp_value = 0;
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uint8_t tmp_length = length;
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uint16_t average_value = 0;
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while (length)
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{
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// decrement length, because 0/1 problem: if lenght = n, than last position off array is n-1
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length--;
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tmp_value += array[length];
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}
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average_value = tmp_value/tmp_length;
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return average_value;
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}
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// Call this function every 2 seconds
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void ReadSparkfunWeatherStation (void)
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{
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unsigned char cnt=0;
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float tmpRegister;
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tmpRegister = 10*weatherMeterKit.getWindDirection(); // Use float for conversion to degrees times 10, than put it in integer register for ModBus
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MeasuredData.WindDirection = tmpRegister;
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tmpRegister = 100*(weatherMeterKit.getWindSpeed())/3.6; // Use float for conversion to m/s times 100, than put it in integer register for ModBus
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MeasuredData.WindSpeed = tmpRegister;
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tmpRegister = 100*weatherMeterKit.getTotalRainfall(); // Use float for conversion to l/m2 times 100, than put it in integer register for ModBus
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MeasuredData.Rain = tmpRegister;
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// FIFO for calculating wind gust of last 10 minutes
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// to preserve valuable RAM we cannot store all measurements of the last 10 minutes.
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// 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.
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// This second FIFO is 10 deep: it stores the maximum values of the last 10 minutes.
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// The maximum value from this FIFO is the maximum wind gust of the last 10 minutes.
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if ( WindGustData1Counter < 29 )
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{
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WindGustData1Counter++;
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}
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else
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{
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if ( WindGustData2Counter < 9 )
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{
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WindGustData2Counter++;
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}
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else
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{
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WindGustData2Counter=0;
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}
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WindGustData2[WindGustData2Counter] = MaxOfArray(WindGustData1, 30);
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WindGustData1Counter=0;
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}
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WindGustData1[WindGustData1Counter] = MeasuredData.WindSpeed;
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MeasuredData.WindGust= MaxOfArray(WindGustData2, 10);
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// Smart FIFO, same as for Wind Gust, but now for average wind speed over 10 minutes
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if ( WindAverageData1Counter < 29 )
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{
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WindAverageData1Counter++;
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}
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else
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{
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if ( WindAverageData2Counter < 9 )
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{
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WindAverageData2Counter++;
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}
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else
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{
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WindAverageData2Counter=0;
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}
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WindAverageData2[WindAverageData2Counter] = AverageOfArray(WindAverageData1, 30);
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WindAverageData1Counter=0;
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WindAverageData1[WindAverageData1Counter] = MeasuredData.WindSpeed;
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}
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WindAverageData1[WindAverageData1Counter] = MeasuredData.WindSpeed;
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MeasuredData.WindSpeed = AverageOfArray(WindAverageData2, 10);
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// Record rainfall in one hour, save last 24 readings in FIFO
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if ( ( millis() - HourTimer) >= 3.6e+6) {
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HourTimer = millis();
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if ( RainPerHourCounter < 23 )
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{
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RainPerHourCounter++;
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} else {
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RainPerHourCounter=0;
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}
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RainPerHour[RainPerHourCounter] = MeasuredData.Rain;
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// Every time before we reset the TotalRainCounter we add the amount to the RawRainCounter.
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// This 16 bit register will eventually overflow, but 655.35mm of rain fall is a lot!
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MeasuredData.RainfallCounter += MeasuredData.Rain; // We don't care about the rounding error due to the convertion from float to int
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weatherMeterKit.resetTotalRainfall();
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// Calculate rain fall in the last 24 hours
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MeasuredData.RainLast24=0;
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for (cnt=0; cnt<24;cnt++) {
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MeasuredData.RainLast24 += RainPerHour[cnt];
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}
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}
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MeasuredData.Rain = RainPerHour[RainPerHourCounter];
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}
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void setup() {
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MySerial.begin (Baudrate); // works on all boards but the configuration is 8N1 which is incompatible with the MODBUS standard
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// prefer the line below instead if possible
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// MySerial.begin (Baudrate, MB_PARITY_EVEN);
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// initialize digital pin LED_BUILTIN as an output and turn it on.
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pinMode(LED_BUILTIN, OUTPUT);
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digitalWrite(LED_BUILTIN, HIGH);
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//Setup control lines for RS485 driver
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pinMode(RS485_RE,INPUT); // In hardware connected to RS485_DE. Should be input to prevent a short circuit!
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pinMode(RS485_DE,OUTPUT);
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digitalWrite(RS485_DE,LOW);
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mb.config (Baudrate);
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mb.setAdditionalServerData ("TEMP_SENSOR"); // for Report Server ID function (0x11)
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// Add SensorIreg registers - Use addIreg() for analog Inputs
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mb.addIreg (SensorIDIreg);
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mb.addIreg (SensorWindDirectionIreg);
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mb.addIreg (SensorWindSpeedIreg);
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mb.addIreg (SensorWindGustIreg);
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mb.addIreg (SensorTemperatureIreg);
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mb.addIreg (SensorRainIreg);
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mb.addIreg (SensorRainLast24Ireg);
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mb.addIreg (SensorRainSinceMidnightIreg);
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mb.addIreg (SensorHumidityIreg);
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mb.addIreg (SensorPressureIreg);
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mb.addIreg (SensorLuminosityIreg);
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mb.addIreg (SensorSnowFallIreg);
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mb.addIreg (SensorRainfallRawIreg);
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mb.addIreg (SensorTemperatureBackupIreg);
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mb.addIreg (SensorStatusBitsIreg);
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// Add HeaterCoil register
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mb.addCoil (HeaterCoil);
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// Set Weather station ID
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mb.Ireg (SensorIDIreg, 0x5758);
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// Set unused register to zero
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mb.Ireg (SensorRainSinceMidnightIreg, 0);
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mb.Ireg (SensorSnowFallIreg, 0);
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Serial.println(F("Weather station v0.3.0"));
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Serial.println(F("(C)2024 M.T. Konstapel"));
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Serial.println(F("This project is free and open source"));
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Serial.println(F("More details: https://meezenest.nl/mees/"));
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// The standard library of the Si7021 sets the heater element to the default 3.1mA, but we want the full power
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// We could alter the library, but than we break compatibility. So for this one time we do a raw-write to the
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// heater register.
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const uint8_t SI7021_I2C_ADDRESS =(0x40);
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const uint8_t SI7021_CMD_WRITE_HEATER_CONTROL_REG =(0x51);
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const uint8_t SI7021_HEATER_FULL_BLAST =(0x0F); // Set heater to 94mA
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i2c.writeByte(SI7021_I2C_ADDRESS, SI7021_CMD_WRITE_HEATER_CONTROL_REG, SI7021_HEATER_FULL_BLAST);
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// Initialize BMP280 pressure sensor
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Serial.print(F("Pressure sensor BMP280 "));
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if (bmp280.initialize())
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Serial.println(F("found"));
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else
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{
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Serial.println(F("missing"));
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while(1) {
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digitalWrite(LED_BUILTIN, HIGH); // turn the LED on (HIGH is the voltage level)
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delay(500); // wait for half a second
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digitalWrite(LED_BUILTIN, LOW); // turn the LED off by making the voltage LOW
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delay(500);
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}
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}
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// onetime-measure:
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bmp280.setEnabled(0);
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bmp280.triggerMeasurement();
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// Expected ADC values have been defined for various platforms in the
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// library, however your platform may not be included. This code will check
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// if that's the case
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#ifdef SFE_WMK_PLAFTORM_UNKNOWN
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// The platform you're using hasn't been added to the library, so the
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// expected ADC values have been calculated assuming a 10k pullup resistor
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// and a perfectly linear 16-bit ADC. Your ADC likely has a different
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// resolution, so you'll need to specify it here:
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weatherMeterKit.setADCResolutionBits(10);
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#endif
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// Here we create a struct to hold all the calibration parameters
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SFEWeatherMeterKitCalibrationParams calibrationParams = weatherMeterKit.getCalibrationParams();
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// The wind vane has 8 switches, but 2 could close at the same time, which
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// results in 16 possible positions. Each position has a resistor connected
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// to GND, so this library assumes a voltage divider is created by adding
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// another resistor to VCC. Some of the wind vane resistor values are
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// fairly close to each other, meaning an accurate ADC is required. However
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// some ADCs have a non-linear behavior that causes this measurement to be
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// inaccurate. To account for this, the vane resistor values can be manually
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// changed here to compensate for the non-linear behavior of the ADC
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calibrationParams.vaneADCValues[WMK_ANGLE_0_0] = 943;
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calibrationParams.vaneADCValues[WMK_ANGLE_22_5] = 828;
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calibrationParams.vaneADCValues[WMK_ANGLE_45_0] = 885;
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calibrationParams.vaneADCValues[WMK_ANGLE_67_5] = 702;
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calibrationParams.vaneADCValues[WMK_ANGLE_90_0] = 785;
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calibrationParams.vaneADCValues[WMK_ANGLE_112_5] = 404;
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calibrationParams.vaneADCValues[WMK_ANGLE_135_0] = 460;
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calibrationParams.vaneADCValues[WMK_ANGLE_157_5] = 82;
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calibrationParams.vaneADCValues[WMK_ANGLE_180_0] = 91;
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calibrationParams.vaneADCValues[WMK_ANGLE_202_5] = 64;
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calibrationParams.vaneADCValues[WMK_ANGLE_225_0] = 185;
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calibrationParams.vaneADCValues[WMK_ANGLE_247_5] = 125;
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calibrationParams.vaneADCValues[WMK_ANGLE_270_0] = 285;
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calibrationParams.vaneADCValues[WMK_ANGLE_292_5] = 242;
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calibrationParams.vaneADCValues[WMK_ANGLE_315_0] = 628;
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calibrationParams.vaneADCValues[WMK_ANGLE_337_5] = 598;
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// The rainfall detector contains a small cup that collects rain water. When
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// the cup fills, the water is dumped and the total rainfall is incremented
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// by some value. This value defaults to 0.2794mm of rain per count, as
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// specified by the datasheet
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calibrationParams.mmPerRainfallCount = 0.2794;
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// The rainfall detector switch can sometimes bounce, causing multiple extra
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// triggers. This input is debounced by ignoring extra triggers within a
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// time window, which defaults to 100ms
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|
calibrationParams.minMillisPerRainfall = 100;
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|
|
|
// 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
|
|
// 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);
|
|
|
|
// Begin weather meter kit
|
|
weatherMeterKit.begin();
|
|
|
|
ts = millis();
|
|
RainPerHourCounter = ts;
|
|
}
|
|
|
|
void loop() {
|
|
|
|
// Call once inside loop() - all magic here
|
|
mb.task();
|
|
|
|
// Read each two seconds
|
|
if ( ( millis() - ts) >= 2000) {
|
|
|
|
ts = millis();
|
|
|
|
digitalWrite(LED_BUILTIN, HIGH); // LED as heartbeat
|
|
|
|
// Read temperature and humidity
|
|
ReadHYT221();
|
|
|
|
// Read pressure and temperature
|
|
ReadBMP280();
|
|
|
|
// Read Wind and rain
|
|
ReadSparkfunWeatherStation();
|
|
|
|
// Setting Sparkfun weather station registers
|
|
mb.Ireg (SensorWindDirectionIreg, MeasuredData.WindDirection);
|
|
mb.Ireg (SensorWindSpeedIreg, MeasuredData.WindSpeed);
|
|
mb.Ireg (SensorWindGustIreg, MeasuredData.WindGust);
|
|
mb.Ireg (SensorRainIreg, MeasuredData.Rain);
|
|
mb.Ireg (SensorRainLast24Ireg, MeasuredData.RainLast24);
|
|
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
|
|
|
|
|
|
}
|
|
} |