Opentherm Binary command

[boy_borrie]

Hello!

We want to get data from the boiler and store it. I found some examples and a PDF file with all Opentherm ID's.

I just cant find a good explanation to make the binery code.

I for example want to include the return water temp. This has ID 28. How do i make the opentherm binary command?

P MGS-TYPE SPARE DATA-ID DATA-VALUE
0 000 0000 00000000 00000000 00000000

I hope someone can help me and explain to me how i make the binary command:)

kind regards!

[horace]

have you had a look at the opentherm library

[boy_borrie]

Thank you for the reply!

No i was using a different library. this helps a lot already.

But how do i need to write the code when i want to get the return water temp for example?

[boy_borrie]

For example i found you can just type:

float retour = ot.getReturnTemprature();
Serial.println("Retour temperature is " + String(retour) + " degrees C");

In my code it doesnt turn orange.
Am i doing something wrong?