i have a separate device that has a push button switch. is there a simple way to use the arduino to trigger the switch? like a relay or like a transistor or is there a way without? for example a led torch, the switch is not switching the power to the led only switching (triggering) an IC to turn …

digital switch ? with arduino . how to do it

Grumpy_Mike October 28, 2016, 6:57pm 10

a relay uses to much power

How much is too much?
You can get very low power relays you know.

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