Arduino Multi Zone Controller Relay: If your house have Multi Zone Heating then you can control each zone heating independently with raspberry pi and this will save you lot on your heating cost considering that you don’t have to heat all the house all the time. For this purpose you need to build wireless relay switch as Multi Zone Controller so we can open and close zone valve to circulate water in each zone as needed.

Make sure you power Relay board with 5v power supply. I suggest to used Arduino Mini Pro/Nano 5v version and have power supply connected to relay board as well.

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MySensors Multi Zone Controller Relay – Sketch

For Boiler relay controller it is same pin connection apart from you only need one connection to relay, for boiler check this link