On 5 February 2013 11:22, Benjie Gillam <[email protected]> wrote: > A loaded Raspberry Pi model B sucks down about 700-750mA, or more if > you've hooked up particularly current-hungry USB devices to it. The USB > specification states that USB devices should demand no more than 500mA, and > many computer sockets/hubs will automatically disconnect devices that suck > down more power than this - especially if the device doesn't do proper USB > power negotiation. Some cheaper USB hubs (and some more expensive ones too) > don't have per-socket regulation so you can suck the full 2A (or whatever > they provide) out of just one, but I would not recommend it as a long term > solution - the Pi is notoriously unstable when it's not connected to a > decent power supply. Many computers provide more than 500mA per socket, but > this cannot be relied upon. > > Some USB hubs deliberately have a high current port - these are normally > highlighted for charging iPads and the like. Otherwise standard > tablet/phone chargers that plug into the wall work quite well - I'd advise > checking that these provide at least 800mA before using it. I'm using a > 2.1A Nexus 7 charger for my RPi and it works wonderfully. > > Hope this helps, > > Benjie >
Most of my efforts so far have involved the dedicated power supply and an unpowered hub, but I have experimented with a single powered hub in various configurations and have had no problems. It goes without saying that I monitor the current being drawn most carefully! Chris. > > Please post to: [email protected] >> Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire >> LUG URL: http://www.hantslug.org.uk >> -------------------------------------------------------------- >> > >
-- Please post to: [email protected] Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire LUG URL: http://www.hantslug.org.uk --------------------------------------------------------------
