We produce this board based on the open-source arduino official schematics.The printing or color on the board may be different from each production date, but the function is exactly the same.
The Uno now uses an ATMega16U2 instead of the ATMega8U2 chip. Faster transfer rates and more memory
No drivers needed for Linux or Mac (inf file for Windows is needed and included in the Arduino IDE). The ability to have the Uno show up as a keyboard, mouse, joystick, etc.
3.3VV/5V Supply Voltage and IO Voltage is optional. More 3.3V modules supported, such as Xbee module, Bluetooth module, RF module, GPRS module, GPS module, LCD5110 Backlight and so on, but the original version can only support 5V IO
Add SDA and SCL pins next to the AREF. In addition, there are two new pins placed near the RESET pin. One is the IOREF that allow the shields to adapt to the voltage provided from the board. The other is a not connected and is reserved for future purposes. The Uno R3 works with all existing shields but can adapt to new shields which use these additional pins

Technical Details

Product Details

Package Dimensions
Width : 3.4 inch
Height : 0.6 inch
Length : 4.8 inch

Shipping Weight: 0 ounce (View shipping rates and policies)

ASIN : B00KG2UBHE