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IOREF
18
RESET
19
Header
Power Pin
20
3V3
Power Pin
21
5V
Vin
22
Analog Pins
23
This pin on the board provides the voltage
reference with which the microcontroller
operates. 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.
Connect an external button to reset the
board. The function is the same as reset
A 3.3 volt supply generated by the on-board
regulator. Maximum current draw is 50 mA.
Provides 5V output voltage
You can supply an external power input
DC7-12V through this pin to Arduino board.
Onboard has 6 analog inputs, labeled A0 to
A5.
button.
72
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