Elecrow Crowduino Mega2560 board, almost the same usage and performance with the Arduino Mega2560 but with some difference on the power circuit to ensure the power. Based on the ATmega2560 (datasheet). The Elecrow Mega2560 has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.

With more IOs and larger flash than the Crowduino Uno_SD or Crowduino 328, the Crowduino Mega2560 would be helpful in applications that needs more IOs or larger flash such as in 3D printer projects. It also comes with a type-B USB wire to enable you start the project once you get it in hand.  

Features

• 100% compatible with Arduino Mega
• 54 Digital IO
• 16 Analog inputs
• 14 PWM outputs
• 4 Hardware serial ports (UART)
• Compatible with most Arduino Duemilanove and Diecimila Shields
• ICSP Header
• Can be powered through a battery or through a AC to DC adaptor

Specification

• Microcontroller: ATmega2560
• Operating Voltage： 5V
• Input Voltage (recommended): 7-12V
• Input Voltage (limits): 6-20V
• 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

Usage

Mega2560 Pin Mapping

Wiki link