Arduino Mega 2560 R3 — ATmega2560 Microcontroller Development Board

The Arduino Mega 2560 R3 is the go-to development board when your project outgrows the Uno: 54 digital I/O pins (15 with PWM), 16 analogue inputs, 4 hardware UARTs, 256KB of flash, and 8KB of SRAM give it the room to run complex projects that would overflow a smaller board. Compatible with the full Arduino IDE ecosystem and the massive library of shields designed for the Mega form factor.

The R3 revision adds compatibility with the Arduino Due shield pinout and improves USB-to-serial communication reliability. The large prototyping area of the Mega pinout makes it popular for CNC machine control (GRBL Mega), 3D printer firmware (Marlin), large sensor arrays, robotics controllers, and any project requiring multiple serial buses simultaneously.

• MCU: ATmega2560 @ 16MHz
• Flash: 256KB | SRAM: 8KB | EEPROM: 4KB
• 54× digital I/O (15 PWM capable)
• 16× analogue inputs (10-bit ADC)
• 4× hardware UART
• I²C, SPI supported
• USB-B for programming and serial monitor
• 7–12V input jack for standalone power
• Compatible with Arduino IDE 1.x and 2.x