rooster
Posts: 100
Joined: Thu Aug 02, 2012 8:09 pm

raspberry pi power source

Mon Oct 01, 2012 10:02 am

I just got a Pi from maplin this morning. It contains a powered usb hub and a power source. also a note saying not too stress the usb sockets too much and to use the powered hub if necessary.

there was a discussion here once about powering the Pi from the usb hub so you don't need the power source for the Pi.

Has anyone done this? Does it work? I will try tonight but wanted to get some feedback incase it blows the Pi.

User avatar
rew
Posts: 423
Joined: Fri Aug 26, 2011 3:25 pm

Re: raspberry pi power source

Tue Oct 02, 2012 8:34 am

Yes, I've done it and it works.

That is: If you have a rev 1 board, there is a polyfuse between the "downstream" USB ports (those next to the ethernet) and the hub. So that won't be able to power a 'pi. You'll have to use a proper miniUSB cable between one of the ports of the hub and the power input on the 'pi.

If you have a rev 2 board, the datacable between the hub and the rpi might be able to carry power "upstream" into the 'pi.

This alll does depend on the hub being "cheap" in that they didn't separate the incoming and outgoing power rails.
Check out our raspberry pi addons: https://www.bitwizard.nl/shop/

simplesi
Posts: 2327
Joined: Fri Feb 24, 2012 6:19 pm
Location: Euxton, Lancashire, UK
Contact: Website

Re: raspberry pi power source

Tue Oct 02, 2012 8:44 am

That is: If you have a rev 1 board, there is a polyfuse between the "downstream" USB ports (those next to the ethernet)
The latter day rev1 boards had greenish polyfuses replaced with a black "zero ohm" components so if you've got the black ones you can power your RPi fine using the USB connector

regards

Simon
Seeking help with Scratch and I/O stuff for Primary age children
http://cymplecy.wordpress.com/ @cymplecy on twitter

Return to “Automation, sensing and robotics”