The Arduino Mega is just the Arduino for when you need to bring the big guns out. It has 54 GPIO, 4 UART pins, 16 Analog inputs and more

Features

• Microcontroller ATmega2560
• Operating Voltage 5V
• Input Voltage (recommended) 7-12V
• Input Voltage (limits) 6-20V
• Digital I/O Pins 54 (of which 15 provide PWM output)
• Analog Input Pins 16
• DC Current per I/O Pin 40 mA
• DC Current for 3.3V Pin 50 mA
• Flash Memory 256 KB of which 8 KB used by bootloader
• SRAM 8 KB
• EEPROM 4 KB
• Clock Speed 16 MHz
• Resettable polyfuse that protects PC USB ports from shorts and overcurrent