One pin is the IOREF that permit the shields to adjust the voltage offered from the Arduino board. Additionally, there are two latest pins located near the RST pin. The SCL & SDA pins of Mega 2560 R3 board connects to beside the AREF pin. This board can be protected from the unexpected electrical discharge by placing a base plate. So, the power supply of this board can be done by connecting it to a PC using a USB cable, or battery or an AC-DC adapter. This board mainly includes everything which is essential for supporting the microcontroller. It includes digital input/output pins-54, where 16 pins are analog inputs, 14 are used like PWM outputs hardware serial ports ( UARTs) – 4, a crystal oscillator-16 MHz, an ICSP header, a power jack, a USB connection, as well as an RST button. The microcontroller board like “Arduino Mega” depends on the ATmega2560 microcontroller.
