Three weeks ago I finished my home build thermostat and heater control using openHAB and MySensors and I am really pleased with the result so far. The set-up consists of two Arduino Pro Mini’s, one 3.3v for the battery powered MySensors temperature sensor in the living and one 5v version for the relay control placed next to the heating unit. Because I didn’t like the idea of controlling the heater over a wireless connection I used an Ethernet module for connectivity. I also added two temperature sensors for measuring the heat in and out of the heater. I eventually ended up by using only the temperature reading of the one that measures the returning heat flow in order to minimize the overshoot. I’m still fine tuning the heating rule, so I will publish the code when I’m completely satisfied.

Have a look at the screen shots below to get an impression how it looks like in openHAB.

Screenshot from 2015-01-22 22:41:39 Screenshot from 2015-01-22 22:42:05 Screenshot from 2015-01-22 22:42:51

More on this subject to follow..