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Author Topic: uno powersupply and usb  (Read 321 times)
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is it safe to have the power supply running the arduino uno AND the usb cable plugged in? just curious. thank you.
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is it safe to have the power supply running the arduino uno AND the usb cable plugged in? just curious. thank you.

Yes, you can have both USB connector plugged into a PC and an external DC voltage source connected to the Uno's external DC connector at the same time. If both connectors have power then the Uno's internal auto-voltage selector will utilize the external voltage source to power the board.

Lefty
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thank you my friend
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