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This version is optimized in the original version , mainly for customers under the functional requirements for product quality and high case designed both to ensure consistent and compatible with the original, but also easy to use.
Operating Voltage: 5V
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
1 x Mega 2560 ATmega2560-16AU Board (Arduino-compatible) 1 x USB cable
The Mega is 100% compatible with Arduino and most shields designed for the Arduino
The chip is Atmega2560-16au and Atmega16u2, same with the official version.
Improved and expert version: 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
Stronger RESET circuit.
It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with an AC-to-DC adapter or battery to get started.