weatherstation/firmware/sensors.ino

#include "config_user.h"

int anemometerRotations = 0;
unsigned long currentTime = 0;

float fetchTemperature() {
  return bme.readTemperature();
}

float fetchPressure() {
  return bme.readPressure() / 100.0F;
}

float fetchHumidity() {
  return bme.readHumidity() * HUMIDITY_FACTOR;
}

float fetchLight() {
  //TODO read values
  uint16_t red, green, blue, white, lux;

  while(!apds.colorDataReady()) {
    delay(5);
  }

  apds.getColorData(&red, &green, &blue, &white);
  //calculate lux
  lux = apds.calculateLux(red, green, blue);
  return lux * LIGHT_FACTOR;
}

ICACHE_RAM_ATTR void _anemometerInterrupt() {
  anemometerRotations++;
#ifdef DEBUG
  Serial.print("*");
#endif
}

float fetchWindspeed() {
  anemometerRotations = 0;
  currentTime = millis();
  int interruptNumber = digitalPinToInterrupt(ANEMOMETER_PIN);

  attachInterrupt(interruptNumber, _anemometerInterrupt, RISING);
  delay(1000 * 5);
  detachInterrupt(interruptNumber);

  return (float)anemometerRotations / 5.0 * 2.4;
}

// Copied from https://arduinodiy.wordpress.com/2016/12/25/monitoring-lipo-battery-voltage-with-wemos-d1-minibattery-shield-and-thingspeak/
#ifdef BATTERY_POWERED
float getBatteryVoltage() {
  // ESP8266 ADC pin input voltage range ist 0V .. 1V
  // The Wemos D1 mini does already contain a voltage divider circuit: A0(Wemos PCB) -- [220kOhm] -- ADC (ESP8266)-- [100kOhm] -- GND
  // The (+) pole of the battery is connected to the A0 pin of the Wemos board through a additional 100kOhm resistance.
  // The battery voltage of 4.2V max is measured as 1.0V on ESP8266 ADC pin.
  uint16_t raw = analogRead(A0);
  float volt = raw / 1023.0;
  return volt * 4.2;
}

float isBatCharging() {
  if (LOW == digitalRead(BAT_CHARGING_PIN))
  {
    return BAT_CHARGE_STATE_CHARGING;
  } else if (LOW == digitalRead(BAT_CHARGED_PIN))
  {
    return BAT_CHARGE_STATE_CHARGED;
  }

  return BAT_CHARGE_STATE_NOTCHARGING;
}

#endif