Arduino Mega is a ATmega2560 as the core microcontroller development board, itself has 54 groups of digital I/O input/output end (14 of which group do PWM output), 16 groups of simulation than input, 4 groups of UART (hardware serial ports), using 16 MHz crystal oscillator. As with bootloader, it can directly through USB to download the program without other external programmer. The power supply part can be selected by USB power supply, or use AC-to-DC adapter as the external power supply and battery.
Features:
Microcontroller                                ATmega2560
Operating Voltage                           5V
Input Voltage(recommended)      7-12V
Digital I/O Pins                               54(of which 14 provide PWM output)
Analog Input Pins                           16
DC Current per I/O Pin                 40Ma
Flash Memory                                 256KB of which 4 KB used by bootloader
DC Current for 3.3 V Pin              50 Ma
SRAM                                               8 KB
EEPROM                                         4KB
Clock Speed                                    16MHz