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Mastering Arduino by Jon Hoffman

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Power pins

The Arduino has several power pins. They are as follows:

  • VIN: This pin is used when we power the Arduino board using an external power supply. This is the pin used in the Using the VIN/GND pins to power the Arduino section of this chapter.
  • GND: These are the ground pins.
  • 5V: This is 5V out and is used to power most sensors.
  • 3.3V: This is 3.3V out and can be used to power sensors that are compatible with 3.3V. A list of some compatible 3.3V sensors can be found here: https://www.dfrobot.com/wiki/index.php/3.3V_Compatible_Device_List.
  • Reset: This pin can be used to reset the Arduino board by an external source.
  • ioref: This is the reference voltage for the board. For the Arduino, this will be 5V.

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