I want to build a thermostat for my fireplace. I want to use my Arduino to turn it ON and OFF.
The fireplace has got a switcher on the wall and I have measured it and the voltage different from one side of the switch to the other side is 0,238V. It seems pretty low but that is what it is.
I bought this relay that I am going to be able to use with my Arduino.
I know relays are usually used to turn ON/OFF circuits that are running at a higher voltage. In this case, my relay will have to run a circuit that is running in a much less voltage. Will the relay do what I need it to do? or it will actually create a higher voltage in the fireplace circuit?
Best Answer
Yes, that relay module will be fine. It provides an isolated contact closure that is compatible with your fireplace's millivolt control circuit.
The point of a relay is that it isolates the control circuit from the circuit being controlled. It doesn't matter whether the latter involves higher or lower voltages — or even the same voltage.