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To be able to switch 220 volt stuff on and off using arduino, I need a relay (I assume). Is there really no nice extention cable with built in relay so you dont need to cut and connect high voltage.

I imagine a Power strip With a simple input port that can be controlled from the andruino, just like a relay board. When I Google this I get a lot of USB controlled and remote controlled, but none that works with an andruino project.

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PowerSwitch Tail is what you are looking for.

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