Pins

These pins can do digital activities

Functions provided are

• Digital Input

• Digital Output

These pins can provide PWM functionality in addition to the digital functions

Functions provided are

• Digital Input

• Digital Output

• PWM Output

  • This is a pseudo analog output

These pins can provide analog functionality in addition to the digital functions.

Functions provided are

• Digital Input

• Digital Output

• Analog Input

If Analog Pins are used for a digital activity it is best to delay the analog function, to avoid inteferences with the digital signals.

Powering the Arduino

Can be done using

• DC Barrel jack

• USB connector

• VIN pin

Power can be taken out for peripheral devices using

• 5V pin

• 3.3V pin

• VIN pin

Using the VIN pin is not a good idea as it directly connects to the microcontroller and can easily damage it, if used incorrectly. Therefore avoid using unless absolutely necessary.

• AREF

  • A voltage in the range 0V to 5V can be used here. The the maximum vlaue to the Analog to Digital converter can be programmed to it, increaasing the resolution of the reading.

• IOREF

  • The microcontroller's HIGH voltage value can be taken from this pin. 

    • On common boards it's 5V.

    • But on some it can be 3.3V

• RESET

  • The board can be RESET by connecting this pin to the Ground (GND) pin.

• VIN

  • The pin is connected to the microcontrollers voltage rails. Faulty wiring this can damage it permanently. Can be used to power the microcontroller bypassing the regulators, if needed.