A NodeMCU with 3 DS18B20 monitors the temperatures (T[o, T[u]) of a storage tank, heated by a combination of oil boiler, wood boiler and solar panels, the temperature of the wood boiler (T[HV]), and the temperature of the exhaust gas (T[Ag].
Pellet burner temperature and pellets volume checking. Temperature sensor - DS18B20, Pellet level - Ultrasonic distance meter. Nodemcu V3. Oled LCD. In Future connected with PLUM controller over RS485.