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July 17, 2011, 7:25 am
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Just watched this episode with David L Jones, and the subject of a USB
kill switch came up
We have done this before, you simply take both of the USB data lines
to ground. This is the method
of performing a "reset" to the USB device.
This can be done using a double pole switch/relay to mechanically
switch both lines to ground,
or of you want to control it from a logic level an open collector
device like a 7407 / 7417 can be used to ground out the lines.
Have used this method for about 5 years on USB mice without problems,
not tried it with USB 2 devices though as have had no need, so unless
the extra circuitry interferes with the bus at higher speed, I don't
see why it wouldn't work.
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