First off, they looked into a plug-in thermostat controller, and found a cheap one called the HeaterMate. Unfortunately it left a lot to be desired.

But with a little sweat-equity you can fix it with this Arduino thermostat and temperature display. We’ll stipulate that an Arduino may be overkill for this application and that microcontrollers ...

Four engineers from Spark have pooled their skills and resources to create a new open source smart thermostat based on Arduino using $70 of components.

I have implemented the gateway as in your schematic and used the code. Thank you for the good instructions. I have however found my thermostat to not implement all features of the OpenTherm protoco ...

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