This pin on the Arduino board provides the voltage reference with which the microcontroller operates. This regulator also provides the power supply to the SAM3X microcontroller. ![]() ![]() A 3.3 volt supply generated by the on-board regulator. Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V).
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