I am trying to get an Arduino hook up with a Mitsubishi AC system but it seems tricky.
I have few Mitsubishi Fden140: http://www.orionairsales.co.uk/mitsubishi-heavy-industries-air-conditioning-fden140v-ceiling-145kw--48000btu-heat-pump-inverter-70-p.asp
There is the main thermostat which is connected with 3 Wires ( picture attached ) but I have no idea where I can find some information about what these cables do.
Probably 2 of them carry power ( V+, GND ) and the 3° is like signal.
Can someone help me out to find out some more information about this system? Or How to try to hack it’