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copied!<p>Unfortunately, in most cases you cannot control the power supply to the USB port. The power supply is usually hardwired through, and not switchable in software. You can <a href="http://msdn.microsoft.com/en-us/library/aa393077" rel="nofollow noreferrer">send a reset to a USB device</a>, but that won't work in your case.</p> <p>There are a number of projects on instructables that do similar to what you describe, but unfortunately they seem to either be quite complicated or require expensive parts.</p> <p>EDIT: There is actually a product currently in the news which would do want you want, but it doesn't appear to be shipping yet: <a href="http://www.pwrusb.com/" rel="nofollow noreferrer">http://www.pwrusb.com/</a></p> <p>EDIT (again): Apparently <a href="http://dannf.org/bloggf/tech/wootoff-lights.html" rel="nofollow noreferrer">you can do this with some usb hubs</a>. <a href="http://blog.andrew.net.au/2009/01/17" rel="nofollow noreferrer">This post</a> sugggests <a href="http://rads.stackoverflow.com/amzn/click/B00007AKAZ" rel="nofollow noreferrer">the Linksys USB2HUB4</a> is one that works.</p> <p>EDIT (and again): Apparently there are a number of similar questions, but there don't seem to be any more useful answers:</p> <ul> <li><a href="https://stackoverflow.com/questions/405269/custom-usb-device-that-disables-power-to-usb-devices-plugged-into-it">https://stackoverflow.com/questions/405269/custom-usb-device-that-disables-power-to-usb-devices-plugged-into-it</a></li> <li><a href="https://stackoverflow.com/questions/404097/windows-power-off-an-usb-device-in-software">Power off an USB device in software on Windows</a></li> <li><a href="https://stackoverflow.com/questions/1762989/is-there-software-or-code-to-alter-usb-power-output">Is there software or code to alter USB power output</a></li> <li><a href="https://stackoverflow.com/questions/2360438/can-i-write-a-program-that-swiches-usb-on-off">Can I write a program that swiches USB on/off</a></li> </ul>

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