Use an RPi to controll your HVAC

Nice build, simple board too, the author basically makes a shield, or hat for Raspberry Pi to help interface your heating/cooling systems.  If you already have a RPi, you can by the shield and materials four I think $50 US?  You can buy the whole thing ready to go in a case for $100 EURO.  Which I think is around $150 US, cheaper than a NEST.

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