I'd like to make an ultrasonic switch for my light bulbs. Since the ground wire passes through the switch, how would I use an ultrasonic sensor or something like that to make it work? And would it need coding or a arduino?

Turn on lights

Arrch December 10, 2012, 6:05pm 4

What kind of arduino I need and others components?

Any kind of Arduino, a sensor and something to switch the light like a relay.

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