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Sonoff with contactor


I am new to this community, I was wondering, to switch on an air conditioner or garage roller door, would I use a NO or NC contactor with a sonoff.

Can't speak for the ac unit but for most garage door openers the switch is N/O, momentary closure to complete the circuit. Hope it helps.

The schematic below was drawn in the past to illustrate how to connect a 240V heater with a contactor relay and Sonoff Basic.  For a 120V circuit you would use the Neutral instead of L2 and a 120V coil on the contactor.

Hope that helps.


Here are a couple more schematics you may like.



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