Posts: 13
Joined: Tue Jul 08, 2014 8:44 am

Power Control of PC (power on/off)

Tue Feb 21, 2017 9:56 am


I'm trying to control the power of a PC, through shorting the power pins on an ATX motherboard.
I'm looking for the simplest solution possible.
I found this guide: ... /?ALLSTEPS
And I actually tried it and it worked!

My question is, am I damaging the motherboard or the pi? I know there's some discrepancy between the 3.3V of the pi and the 5V of the ATX motherboard, is that true? will that be a problem?

Posts: 7299
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Power Control of PC (power on/off)

Tue Feb 21, 2017 11:18 am


From looking at the site you linked to, it seems that you are connecting you Pi GPIO directly to the switch pins on your PC motherboard.
I would NOT do this you are mixing 5v and 3.3v you could well damage you Pi, your PC or both.
If you want to do this than use some small relays driven by the Pi GPIO and connect the contact to the switch pins on the motherboard, this way each circuit is isolated from the other.
We want information… information… information no help
The use of crystal balls & mind reading are not supported

User avatar
Posts: 2001
Joined: Fri Jan 13, 2012 4:41 pm
Location: Darkest Somerset, UK
Contact: Website

Re: Power Control of PC (power on/off)

Tue Feb 21, 2017 1:43 pm

Have a look at the circuit I'm using here:
Attempts to contact me outside of thes forums will be ignored unless signed in triplicate, sent in, sent back, queried, lost, found, subjected to public enquiry, lost again, and finally buried in soft peat for three months and recycled as firelighters

Return to “Automation, sensing and robotics”