![]() The Mega2560 differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. The Mega 2560 is an update to the Mega, which it replaces. The Mega is compatible with most shields designed for the Duemilanove or Diecimila. It contains everything needed to support the microcontroller simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started. It 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. See this user-contributed tutorial for more information.The Mega 2560 is a microcontroller board based on the CH340. Or you can use the ISP header with an external programmer (overwriting the DFU bootloader). You can then use Atmel's FLIP software (Windows) or the DFU programmer (Mac OS X and Linux) to load a new firmware. On Rev2 or later boards: there is a resistor that pulling the 8U2/16U2 HWB line to ground, making it easier to put into DFU mode.On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2.The ATmega16U2/8U2 is loaded with a DFU bootloader, which can be activated by: ![]() The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available in the Arduino repository. You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using Arduino ISP or similar see these instructions for details. ![]() It communicates using the original STK500 protocol (reference, C header files). The ATmega2560 on the Mega 2560 comes preprogrammed with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. For details, see the reference and tutorials. The Mega 2560 board can be programmed with the Arduino Software (IDE). The Mega 2560 board is compatible with most shields designed for the Uno and the former boards Duemilanove or Diecimila. The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. ![]() This gives your projects plenty of room and opportunities. With 54 digital I/O pins, 16 analog inputs and a larger space for your sketch it is the recommended board for 3D printers and robotics projects. The MEGA 2560 is designed for more complex projects. ![]()
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