Arduino Mega 2560 R3
High-pin-count Arduino board based on the ATmega2560 at 16 MHz with 256KB flash, 54 digital I/O pins, 16 analog inputs, and 4 hardware UARTs for complex projects.
$47.80
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Specifications
Components
8-bit AVR RISC microcontroller at 16 MHz with 256KB flash, 8KB SRAM, 4KB EEPROM, 54 digital I/O, 16 analog inputs
Bus Interfaces
GPIO Map
Overview
The Arduino Mega 2560 R3 is a microcontroller development board based on the ATmega2560 running at 16 MHz. With 54 digital I/O pins (15 PWM-capable), 16 analog inputs, and four hardware UARTs, it is the go-to Arduino board for projects that outgrow the UNO's pin count. The R3 revision brought compatibility improvements aligned with the Arduino R3 standard.
The board provides 256KB of flash memory (8KB reserved for the bootloader), 8KB of SRAM, and 4KB of EEPROM — significantly more than the UNO-class boards. This makes it well suited for projects requiring large lookup tables, complex state machines, or data buffering.
Power can be supplied via USB or through the onboard DC barrel jack accepting 7–12V. The 16 MHz crystal oscillator and USB connectivity via an ATmega16U2 USB-to-serial bridge (R3 revision) ensure reliable programming and communication through the standard Arduino IDE.
The Arduino Mega 2560 R3 is officially released under open hardware licenses with schematics and design files publicly available, making it widely supported by shields, libraries, and third-party accessories.
Use Cases
4Prototyping
Rapid hardware prototyping and proof-of-concept development with breadboard-friendly form factors and accessible development environments.
Robotics
General robotics applications including mobile robots, robotic arms, drones, and automated systems.
automation
Education
Teaching programming, electronics, and computer science concepts. Popular in schools, universities, and coding bootcamps.
Resources
Where to Buy
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