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Author Topic: Power Source - Laptop USB & 12v barrel jack?  (Read 679 times)
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I'm curious if I plug in both USB cable to A-B port and a 12v wall-wart adapter to the barrel jack will it harm the Arduino?  Or will the 12v wall-wart adapter know to disable the power source in the USB cable? thanks! smiley-eek
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peace*&^

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No it won't harm, the arduino will switch to the wall wart power when both are plugged in smiley
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