The Arduino MEGA is a microcontroller board based on the Atmel ATmega2560 chip.
It has 256kb of flash memory (4kb reserved for the bootloader), 54 I/O pins (14 of them with PWM control), 16 ...

The Arduino Uno is a microcontroller board based on the ATmega328. It has 14 digital I/O pins (of which 6 can be used as PWM outputs), 6 analog inputs, and 32kb of flash memory.
This is a ...