I have a Rehau (rebranded oj electronics) room thermostat and I'm wondering what data I might be able to take from it for an Arduino project I have in mind.
It has an additional 6-pin connection, is there any way to discover what output this might be for?
Looking for things like:
Current temperature
Set temperature
Thermostat On/Off state
Selected Channel
Hello
Post the datasheet of the hardware to see how we can help.
Have a nice day and enjoy coding in C++.
Дайте миру шанс!
Google gave this. Any help diving into it?
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Hi paulpaulson, not had any luck finding the datasheet unfortunately. Might need to ask the manufacturer and see if they might provide as product now discontinued.
Hi Railroader, Google didn't help me much 
The best option could be to scrap that stuff and build the functionality You need using conventional, available circuitry.
Reusing old stuff often takes a lot of time. Building new often goes faster.
Being a generic consumer item, the pinouts in HERE might be compatible with your unit.
There are a few REHAU product manuals online.
As a consumer product, the connections are sure to be online (and standardised), but as a hobbyist,it’s not a huge leap to create your own digital/programmable thermostat from scratch. a good learning project,
(Note the 24VAC supply normally used)
Other than current on/off state you'd have to "decode" the data being sent to the display.
I'm with everybody else. It's easier to start-over with a temperature sensor (and some other stuff) or buy a WI-Fi thermostat.
It's usually the same with programming... It's often easier to start from scratch and write your own code than to figure-out someone else's code and modify it to your needs.
Or if you are doing home automation there are thermostats that use one of the home automation protocols instead of Wi-Fi.
Visit several of your local heating/cooling contractors and ask them.
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