The Arduino Mega 2560 R3 is a microcontroller board based on the ATmega2560, offering significantly more I/O than standard Arduino boards. With 54 digital I/O pins, 16 analog inputs, and 4 hardware serial ports, it's the go-to board for complex projects that demand extensive connectivity.

The R3 revision adds dedicated SDA and SCL pins next to the AREF pin, plus an IOREF pin that allows shields to automatically adapt to the board's voltage level. Compatible with most shields designed for the Arduino Duemilanove, Diecimila, and Uno.

Key Features

• 54 Digital I/O Pins – 14 usable as PWM outputs
• 16 Analog Inputs – For extensive sensor arrays
• 4 Hardware UARTs – Multiple serial connections for GPS, Bluetooth, and other modules
• 256KB Flash Memory – Room for large, complex sketches
• R3 Pinout – SDA/SCL and IOREF pins for improved shield compatibility
• ATmega2560 – Powerful 8-bit microcontroller at 16MHz

Specifications

• Microcontroller – ATmega2560
• Operating Voltage – 5V
• Input Voltage – 7–12V
• Digital I/O Pins – 54 (14 PWM)
• Analog Input Pins – 16
• Hardware Serial Ports – 4 UARTs
• Flash Memory – 256KB
• SRAM – 8KB
• EEPROM – 4KB
• Clock Speed – 16MHz

Ideal For

• Projects requiring many I/O pins (LED arrays, multi-sensor setups)
• Robotics with multiple motors and sensors
• 3D printer controller boards
• Data logging with multiple serial devices

Package Contents

• 1× Arduino Mega 2560 R3

Resources

• Schematic (PDF)
• Arduino IDE Download