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Is there something like a power switch that I can control from a computer?

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Questions › Is there something like a power switch that I can control from a computer?
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Garmaine asked 4 years ago

I need to control a LED light from a computer program that I am writing, i.e. I want to turn that light on or off from the computer. Is there some kind of power switch or alike that I can connect to from a computer, e.g. its USB port?