IOREF – This pin on the Arduino/Genuino board provides the voltage reference with which the microcontroller operates.The maximum current draw from this pin is 50 mA. 3V3 – This pin outputs a regulated 3.3 volt supply generated by the onboard regulator.Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. 5V – This pin outputs a regulated 5V from the regulator on the board.Vin – The input voltage to the Arduino/Genuino board when it’s using an external power source.So the value of current is much smaller as compared to the voltage. The pins measure the voltage not current because it has a very high value of internal resistance. Analog Input Pins are used to take the signal from analog sensors and convert it into a digital value. The 16 Analog Input Pins are numbered from Pin A0 to Pin A15. Analog Input Pins – Arduino MEGA board has 16 Analog Input Pins.Digital I/O Pins are used to take Digital Input or provide Digital Output in Arduino MEGA Board. In which 15 of them are PWM (Pulse-Width Modulation) Digital I/O Pins. PWM pins are used to simulate analog output. The 54 Digital I/O Pins are numbered from Pin 0 to Pin 53.
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