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Using computer as an electronic switch? Answered

Please help. I really appreciate it.

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Thanks guyfrom7up and Goodhart, I think parallel port will do this. Do you think if I connect wires those are in the usb cable to that simple circuit (picture above) and turn on/off usb port It will work?

you can just use a parallel port Google interfacing parallel port Have one of the outputs drive a transistor (use an optocouple for more protection) which in turn drives a relay (use a protection diode!)

Thanks, But they weren't useful to me. My biggest problem is I can't buy these circuits from net I can't buy anything else because of post problems in here. But I think it's a very simple circuit that everybody can make in home but I don't know ho :(

Some of the things listed in the link are Schematics, nevertheless, interfacing with your USB is probably the way to go, and that can be touchy to say the least.