K
kreed
Guest
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.
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.