Anyone using a Sonoff relay in their projects?

I'm looking for an inexpensive relay that would work with HE. Something like this

anyone used this or something similar?

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I'm using two of them at the end of my garden to control some lights and water pumps etc, I decided to use them as they happily work off 12volts(I have a 12v solar system there).

Both flashed with this excellent firmware.

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thanks Kev, were they adopted by default after you scanned the system or did you have to modify anything to get them learnt into the system and working?

Flash them first and then scan with a PC or phone to find them and then configure them to join your wifi. Install the app and driver onto HE, they will be found and away you go.