SainSmart Mega2560 R3: *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 Arduino Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes.*Stronger RESET circuit.*Atmega 16U2 replace the 8U2 Ethernet Shield: For all version of arduino Main board, 2009 , UNO, mega 1280, mega 2560 With this Ethernet Shield, your Arduino board can be used to connect to internet controller: w5100 works as server or client comes with efficient library and examples direct plug puzzle board, NO soldering needed. Package List:1x SainSmart Mega25601x SainSmart Ethernet Shield1x USB Cable
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