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Question #: 3566

Question: should i be getting power from the parallel port? the green light is on without the usb and i think it might be causing a grounding issue.

Current Solution

Yes, there is a small signal level voltage coming from the parallel port out of the computer. If the pin is high, then it will be outputting 5v and if the pin is low, it will be pulled to ground. It may appear that your parallel breakout board is powered, but will not provide sufficient voltage to properly operate the drivers. The USB power is vital for proper operation.

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