Hello, I have my arduino powered via usb and have connected this motor https://www.sparkfun.com/products/10171 ? to the 5V pin on the arduino directly. I have a 1n4001 diode connected across the motor. No load current I find to be: 210-230mA I partially stopped the motor and saw the current draw …

Motor current draw from 5V pin MADNESS!

kg4wsv January 22, 2013, 7:47pm 7

Probably better stated as "it depends".

USB - Wikipedia

I guess wikipedia trumps the official USB specification.

-j

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