weatherstation/firmware/sensors.ino

int anemometerRotations = 0;
unsigned long currentTime = 0;

float fetchTemperature() {
  //return 10;
  return bme.readTemperature();
}

float fetchPressure() {
  //return 10;
  return bme.readPressure() / 100.0F;
}

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

float fetchLight() {
  uint16_t red, green, blue, white;
  
  while(!apds.colorDataReady()) {
    delay(5);
  }

  apds.getColorData(&red, &green, &blue, &white);
  return white;
}

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/
float getBatteryVoltage() {
  uint16_t raw = analogRead(A0);
  float volt = raw / 1023.0;
#ifdef BOARD_03962A
  return volt * 6.79;
#else
  return volt * 4.0;
#endif
}