A Raspberry Pi + DHT22 used to monitor temperature and humidity in one of the rooms in KSJ
Uses a D1 Mini and Arduino code with an HTU21D for ambient sensing and two DS18B20 OneWire sensors for inlet and outlet temperature measurement. The heat-pump mode detection uses temperature difference and its derivative of the inlet and outlet temperatu
data from Raspberry Pi BME280 sensor project on https://github.com/jrmckenzie/myPiWeather