ROBOTALE MEGA2560 2012 R3 version is the latest version of the the MEGA Series arduino controller, and the 2011 version of the distinction as follows:

1. 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.

Improved 3.RESET circuit than the 2011 version. Prevent RESET the accidental reset the the RESET circuit more stable.

 

Arduino Mega power supply system, there are two options, USB power supply directly or external power supply.The choice of power supply will automatically switch.External power supply can choose AC - to - DC adapter or battery, the limit of the control panel for 6 v to 12 v voltage range, but if the voltage is less than 6 v, I/O mouth may not be able to provide to 5 v voltage, so will appear unstable;If if the voltage is greater than 12 v, voltage stabilizer will likely overheating protection, are more likely to damage the Arduino MEGA. operating power supply of 6.5 ~ 12 V, recommended power 7.5 V or 9 V.