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Author Topic: Power On an Arduino board.  (Read 830 times)
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Please specify in the documentation where must be the + polarity on the Power Jack.

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You mean like this:

http://arduino.cc/en/Main/ArduinoBoardDuemilanove

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External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector.

And how is this a software issue?
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