Hi, I generally power my Arduino UNO (rev 3) in three ways. Standard USB cable from PC. a wall adapter (similar to iphone charger) with USB interface. a wall adapter with normal co-axial connectors 5vdc 1.04 amps. also I use digital pin 5 as output pin and use digitalWrite on it and it has also…

Output Voltages differ for different power supplies to the arduino.

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