USB Controlled Relay

As noted in my look at the ScreenBar. Not being able to control the light from my PC was one of the downsides. Since then I’ve got to some Elgato Key Lights. Since I spend an increasing amount of time on video calls. This moved lack of USB control from a minor point to something a little more annoying. That prompted me to go look for a solution. USB relays do seem to be a thing. Which gave me an idea.
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