![GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices](https://raw.githubusercontent.com/jpraus/arduino-opentherm/master/doc/otshield.jpg)
GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices
GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices
GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices
![GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices](https://raw.githubusercontent.com/jpraus/arduino-opentherm/master/doc/shield-schematic_rev4.png)
GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices
![GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices GitHub - jpraus/arduino-opentherm: Arduino library and hardware shield to send and receive data from Opentherm devices](https://raw.githubusercontent.com/jpraus/arduino-opentherm/master/doc/rev2-esp8266-3v3.png)