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'[OT] Disabling video via the PC bus'
2008\07\02@224157 by Bruce

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One for the PC gurus I suspect, but is there a bus signal on a PC bus one
can intercept/control that will disable/enable video output to a monitor?

I have an existing device, using an LF initiator coil, that enables the AFE of a
PIC16F639 in an ID badge worn by the user. The LF data from the initiator sends
an 8-bit challenge code to the PIC16F639, wakes up the controller, which then
transmits via UHF (if the challenge code matches) to a receiver that makes or
breaks a video signal (hardware connection between video card & monitor) using
a small DIP relay.

This works fine, but I would prefer to build a card with the receiver that inserts
directly into a PC card slot VS the mechanical relay option.

Is this do-able?

Regards,

-Bruce


2008\07\03@023748 by Jake Anderson

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Bruce wrote:
{Quote hidden}

Not easily (read, practically impossible).
Best bet is probably to make a little serial/usb module then use a tiny
program on the PC itself to just trigger the screen saver or something
similar.

2008\07\03@090230 by Bruce

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> Not easily (read, practically impossible).
> Best bet is probably to make a little serial/usb module then use a tiny
> program on the PC itself to just trigger the screen saver or something
> similar.

Kind of what I figured. Thanks.

Regards,

Bruce

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