9v and USB connected at the same time

Forum 2005-2010 (read only) General Frequently-Asked Questions
1

Will connecting a 9v battery and USB to the Arduino Duemilanove at the same time fry it? If no, which power source will it run off of?

2

No frying...you can hook both up. I'm assuming you're connecting the 9V battery to the VIN pin? Make sure you don't hook it up backwards.

The 9V battery will be used for power in this case.

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