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I have done some modifications to my Raspberry Pi (Model B). The basic idea is to have an active usb-hub connected to the Raspi, so i can control the power of the hub with a switch(it should all run on battery later). Basically my question is, whether i can communicate with an usb-device, which is gaining its power from somewhere else, meaning is it possible to connect an usb-device with just D+ and D- and skip the + and - wires?

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You may probably skip connecting +5V, but you most definitely need to connect ground to achieve any communication.

  • thx, will try that out – hr0m Jul 2 '14 at 10:12

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