Ardu Mega 2560 R3 Mega2560 REV3 ATmega25...

Ardu MEGA2560 2012 R3 version is MEGA series ardu controller latest version, and the 2011 version of the distinction as follows:

1. chip with ATMEGA16U2 alternative 2011 version of ATMEGA8U2, ISP FLASH doubling the capacity to facilitate more powerful expansion and development needs. ATMEGA16U2 addition to providing traditional USB to serial port function, but also allows users to define their own programming other functions, such as the USB port can be configured as a mouse, keyboard, joystick, camera, etc. Of course, these applications have yet to be Arduino team disclose the specific embodiments.

2. In the 2011 version of the external interface based on the increase SDA, SCL (position at the AREF left). Shield IOREF interface can provide a voltage reference. And in order to be considered for future product compatibility IOREF left aside a port.

3.RESET circuit than the 2011 version have been improved. RESET prevent accidental reset, RESET circuit more stable.