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Vga monitor screen saver shutdown detect.

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dr pepper

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Most Helpful Member
I want to setup a pc where the vga monitor shuts off if theres no activity for > 15 mins.
Nothing special about that, however I want to generate a logic change when this happens to signal a microcontroller.
How does a pc typically shutdown its monitor during screensave, does the sync & video just turn off, or does something funky happen like the pc's graphics card talks to the monitor via serial or something.
It wouldnt be too hard to put a simple rc and transistor circuit togther to detect missing vertical sync pulses.
 

Ramussons

Active Member
The Sync turns off.
The monitor senses the loss of sync and (may) display "input signal failure" and shuts down.
 

dr pepper

Well-Known Member
Most Helpful Member
Ok then shouldnt be so hard, I'll see if it'll work, might be lazy & use a 555.
 
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