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Arduino/ESP8266/ESP32 OpenTherm Controller

Based on: http://ihormelnyk.com/Page/arduino_opentherm_controller

Usage

It uses serial commands.

Initialization

init

Read

OpenthermRead [id]

or shortly

r [id]

There is one exception for id=0 status message, which supports also parameter

r 0 3

Write

OpenthermWrite [id] [value]

or shortly

w [id] [value]

What works

  • 0-Status - CH - 256, DHW - 512, CH&DHW - 768
  • 1-Control setpoint - setting works
  • 17-Relative Modulation Level - reading works
  • 25-Boiler flow water temperature - reading works
  • 26-DHW temperature - reading works
  • 27-Outside temperature - should work, but I have disconnected outside sensor
  • 56-DHW setpoint - works
  • 57-Max CH water setpoint - works - shows 80

Some other also works.

Remarks

MCU

I am using ESP32 but it also should work on Arduino or ESP8266.

Boiler

I have Vitodens 100-W.

Discussion

Some discussion on: http://ihormelnyk.com/page/arduino_opentherm_controller

Contributions

Contributions are welcome. Please open issues and/or file Pull Requests.