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PSU rocker switch question.

N

nitrobass24

[H]ard|DCer of the Month - December 2009
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Ok so i have seen where you can stick a paperclip in the main ATX connector to turn on the PSU, but can you do the opposite?

What i would like to do is have the rocker switch be the on/off switch for my mobo.
Would jumping a couple of the pins on the mobo(where the reset/pwr switch is) do the trick?

I am not running windows are anything like that so im not worried about hard shutdowns.

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That should do the trick, shorting out the two pins for the power button. Really, that's what the power button does: it shorts out those two pins. Same with the reset button. Once the motherboard senses that the two pins have been shorted, it will turn on and stay on. Leaving those two pins shorted out will eventually shut down the motherboard, since holding down the power button shuts down the computer.
 
Yea see thats what i was worried about, cause i dont want it to shut down.
 
The only way I can think of to do what you are trying to do is if you break the PS_ON wire coming from the PSU (the green one) and splice the rocker switch into it. That way, if you break the connection, the PSU will shut off, and when you open it, you will be able to turn on the PC. However, turning on the rocker wouldn't turn on the PC in and of itself. You would still need to hit the power button.
 
Not that simple I'm afraid, as Zero points out. You can get momentary rocker switches, if it's just the look you're going for. If you want a positive on/off switch, you need some extra logic.

I think you could achieve this with a single XOR gate (e.g. 74HC86) as edge detector and an RC network to extend the output pulse (powered from Vsb). Can't think of a simpler way to do it, and this may be too simple and could get out of sync with the physical state or be falsely triggered.
 
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