💬 OpenTherm Adapter

[openhardware.io]

https://www.openhardware.io/view/704/OpenTherm-Adapter

[pihome]

your work gave me starting point but there is lot to learn/read about this.... thank you for sharing,

[pihome]

any reason this is deleted from Openhardware site?

[hek]

From the author:

The main reason for deleting the project is that new OpenTherm specifications are coming out with different voltages etc. and this PCB has not been tested with them. As such, someone making or purchasing the PCB may run the risk of damaging their boiler and I do not currently live somewhere where I can play around with making new circuits in line with these new protocol standards. Of course, if I ever get the opportunity to develop a new circuit and create a PCB, I would be happy to make a new project for it.

[tlustoch]

I am working on the analogous project.
For several years I am using hw interface https://github.com/HynekBaran/OpenThermGWMini connecting the boiler and Arduino+NRF24L01 (which acts as a MySensors actuator).
BUT: My boiler supports OpenTherm/Light (OT/-) protocol only. As far as I know, hw ("electric") specs of OT- are same as OT+ (2.0).
So may be the simple OpenThermGWMini hw may be used, but there is missing MySensors sw part.

See the original circuit diagram

Maybe we may share?