Monitor and control Daikin/Rotex (hybrid/Altherma) heat pumps via the 2-wire P1/P2 thermostat interface with an ATmega328P, ESP8266, and electronics. The P1P2Serial library and P1P2Monitor program perform low-level bus operation, the P1P2-bridge-esp8266 program interprets data from/to MQTT supporting Home Assistant MQTT discovery. P1P2Serial may…

Arduino-based controller for Daikin Altherma heat pumps. The controller connect to the Altherma heat pump via P1/P2 bus, has a built-in webserver for configuration (of the controller itself). Integration to Loxone home automation system via UDP protocol, allows you to monitor and control your Altherma heat pump.