BlueCop wrote:I ordered 4 of "No/OS" Raspberry Pi Basic Bundles. They should arrive tomorrow. I am excited to finally get some to play with.
They were listed as having a 1000ma 5v power supply on their order page. The email invoice I received from the company listed them as 700ma from the inventory system. If the email invoice is correct and you are shipping 700ma power supplies could you change the ordering pages to be accurate to what your are shipping.
Will this power supply be sufficient to allow attaching usb devices to the pi? I thought it was 500ma per port on spec.
I also don't understand the power-able usb hub being sold without a power supply for use with the pi? This seems like a setup to disappoint the customer. I wouldn't ascribe this to ignorance rather then malice but it still seems unfriendly to the customer.
The usual figure given is that the power supply should provide 700mA. Up until recently, each USB port was limited to 140mA (280mA total on the two) and the "main fuse" (F3) on the board is set for 1.1A, as I understand.
What it comes down to, is that 700mA will run a Pi just fine (I've done so--but it was a good quality 700mA supply). Better is a 1000mA supply.
You will *not* be able to pull 500mA on USB ports. Stick to low current devices.
And I agree with you...a hub sold as "powered" really ought to come with a power supply...and one that can provide enough to supply 500mA on every port it has, simultaneously (that is, I am given to undestand, the USB 2.0 spec), which means a 4-port hub should have a power supply that can provide MORE than 2A (gotta have some power for the hub circuitry, too).
Trying to use an passive hub on a Pi really isn't going to work...on that point you are absolutely correct.