tdenson
Posts: 153
Joined: Tue May 13, 2014 1:51 pm

Is it possible to supply power via IO pins

Sun Jan 29, 2017 10:44 am

Are the power pins on the IO pins just outputs, or is it possible to power the Pi via them instead of the micro USB socket.

User avatar
rpdom
Posts: 15897
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: Is it possible to supply power via IO pins

Sun Jan 29, 2017 11:18 am

You can supply 5V power using either of the 5V pins and a Ground pin, but this will bypass the on-board fuse (on all models except the Zero which doesn't have one).

tdenson
Posts: 153
Joined: Tue May 13, 2014 1:51 pm

Re: Is it possible to supply power via IO pins

Sun Jan 29, 2017 11:22 am

Probably not a good idea then. I was looking at mounting a Pi on a PCB and wanted to minimise the amount of physical wiring.

User avatar
rpdom
Posts: 15897
Joined: Sun May 06, 2012 5:17 am
Location: Chelmsford, Essex, UK

Re: Is it possible to supply power via IO pins

Sun Jan 29, 2017 11:35 am

You could always add your own fuse between the 5V pin and your power input.

mattmiller
Posts: 2165
Joined: Thu Feb 05, 2015 11:25 pm

Re: Is it possible to supply power via IO pins

Sun Jan 29, 2017 11:57 am

Probably not a good idea then.
As long as cn ensure that your power supply isn't going to give out more than 5.2V, then you'll be fine

tdenson
Posts: 153
Joined: Tue May 13, 2014 1:51 pm

Re: Is it possible to supply power via IO pins

Sun Jan 29, 2017 12:10 pm

No, I think I'll come up with a custom micro USB lead with a plug that connects to a socket on my PCB.

tdenson
Posts: 153
Joined: Tue May 13, 2014 1:51 pm

Re: Is it possible to supply power via IO pins

Sun Jan 29, 2017 12:12 pm

Also, I've just spotted a massive flaw in my plan A - there's no easy way to power cycle

Return to “Automation, sensing and robotics”