I posted this on another subforum, but I got only one opinion, so I am hoping for better results here. I designed a shield that powers Arduino Uno with 5V trough +5V pin. For testing purposes I need to connect Uno to PC, and shield to 12V, but shield has a 5V regulator that powers Arduino Uno.. W…

external 5V at +5V pin, and USB connection

johnwasser March 1, 2011, 4:25pm 2

My Arduino Diecimila has a movable jumper to select between USB power and the power jack. Selecting the power jack will disconnect the USB power and prevent any possible conflicts.

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external 5V at +5V pin, and USB connection

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