The Arduino Mega 2560 Rev3 is a microcontroller board based on the ATmega2560, designed for projects that need more I/O than standard Arduino boards. With 54 digital I/O pins, 16 analog inputs, and 4 hardware serial ports, it's the recommended board for 3D printers, robotics, and other complex builds.

The Rev3 features the ATmega16U2 USB-to-serial converter, the 1.0 pinout with dedicated SDA/SCL and IOREF pins, and a stronger reset circuit. Compatible with most shields designed for the Arduino Uno, Duemilanove, and Diecimila.

Key Features

• 54 Digital I/O Pins – 15 usable as PWM outputs
• 16 Analog Inputs – 10-bit resolution for extensive sensor arrays
• 4 Hardware UARTs – Multiple serial connections for GPS, Bluetooth, and other modules
• 256KB Flash Memory – Room for large, complex sketches (8KB used by bootloader)
• USB Overcurrent Protection – Resettable polyfuse protects your computer's USB ports
• Open-Source Hardware – Schematics and Eagle files freely available

Specifications

• Microcontroller – ATmega2560
• Operating Voltage – 5V
• Input Voltage – 7–12V recommended (6–20V limits)
• Digital I/O Pins – 54 (15 PWM)
• Analog Input Pins – 16
• Hardware Serial Ports – 4 UARTs
• DC Current per I/O Pin – 20mA (40mA absolute max)
• DC Current for 3.3V Pin – 50mA
• Flash Memory – 256KB (8KB used by bootloader)
• SRAM – 8KB
• EEPROM – 4KB
• Clock Speed – 16MHz
• Board Dimensions – 101.52 × 53.3 mm
• Weight – 37g

Ideal For

• 3D printer controller boards
• Robotics with multiple motors and sensors
• LED arrays and multi-sensor setups
• Data logging with multiple serial devices

Package Contents

• 1× Arduino Mega 2560 Rev3

Resources

• Schematic (PDF)
• Eagle Design Files
• ATmega2560 Datasheet (PDF)
• Pin Mapping (ATmega2560)
• Arduino Getting Started Guide
• Arduino IDE Download