How to read the Vaillant eBus

[bruce_miranda]

I can confirm that the Arduino circuit mentioned above works absolutely fine. But is READ only. So you will get the ebus data. You will still need software like ebusd or similar to actually make sense of that ebus data byte stream. This is where the RPI comes in. I have a NAS sitting near my boiler, so my software runs on the NAS itself. The software turns the byte stream into individual messages, that you then have to parse for the values you are interested in.

[dty]

Also bear in mind that you can only read messages that happen to be flying around on the bus. If you're after something that's not actively being talked about by one of the components on the bus then you'll need to build a proper adaptor to allow you to write to the bus to request the data you're after.