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Big brother of the UNO with 54 digital pins, 16 analog inputs, 4 serial ports and 256 KB flash — for large, pin-hungry projects.
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When an UNO runs out of pins or memory, the Mega 2560 takes over. Its ATmega2560 offers 54 digital I/O, 16 analog inputs, four hardware serial ports and eight times the program memory, while keeping UNO shield compatibility. It is the brain of many 3D printers (with a RAMPS shield), CNC machines, robots and home-automation panels.
| Microcontroller | ATmega2560, 16 MHz |
|---|---|
| Memory | 256 KB flash, 8 KB SRAM, 4 KB EEPROM |
| I/O | 54 digital (15 PWM), 16 analog inputs |
| Interfaces | 4× UART, I²C, SPI |
| Input voltage | 7–12 V on barrel jack/VIN, or 5 V USB |
| Dimensions | 101.5 × 53.3 mm |