![]() A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V. IOREF. This pin on the Arduino board provides the voltage reference with which the microcontroller operates.3V3. 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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