QUICK OVERVIEW :
Alternative ATMEGA16U2 chip 2011 version of ATMEGA8U2 , ISP FLASH increased capacity doubled, to facilitate greater functionality extensions, developers need. ATMEGA16U2 addition to traditional USB to serial, also allows user programming to define other functions, such as the USB port can be configured as a mouse, keyboard, game joystick, camera, of course, these applications have yet to be Arduino team to disclose the specific embodiments.External interface increase on the basis of the 2011 version of the SDA, SCL (the left side of the position in the AREF).IOREF interface can be provided to the Shield a voltage reference. And compatibility considerations for future products the IOREF reserve a port on the left side.RESET circuit than the 2011 version. Prevent RESET the accidental reset the the RESET circuit more stable.
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