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RE: Hacking into my gas condensing boiler
You got it right. It's a converter that converts the infrared communication to rs232. There are some implementations for Linux (pi variants etc) but no real microcontroller implementatios I know of. The protocol is not too hard though. I'll add a link to the German site. I forgot that. I speak a bit of German and code/schematics/specs are sometimes in English.
sounds doable, indeed. Do you already have move precise plans on the hardware selection and the firmware functionality for the microcontroller board?
Well, since I have been busy with this idea since so long the available boards have changed too much. I'm thinking something simple with a wired Ethernet. Probably some AVR or ARM. Not sure yet. No Linux board, something bare metal.