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For UNO R3 is an easy-to-use open source controller. Compared with for UNO, there is no major change in hardware. The biggest difference lies in the USB to serial port circuit. Instead, an ATMega16U2 microcontroller is used.Pin changes: Two I2C pins are added next to the AREF pin (SDA and SCL are just copies of Analog 4 and 5, not an additional I2C interface). In addition, two pins are added next to RESET, one is IOREF, which can Allow the expansion board to adapt to the onboard voltage. This pin only tells the current onboard voltage of the expansion board, and the other is to be used later Placeholder pins.More stable RESET circuit. The position of the RESET button has also changed, and it has been moved to the corner of the board close to the USB interface, making it easier to press.ATmega16U2 replaces 8U2. This does not mean that R3 with 16K flash can make your code run faster. This update is for the USB interface chip. In theory, it allows for UNO to simulate USB HID, such as MIDI/Joystick/ Keyboard.Type:Development boardModel Number: ATmega16U2Application: ComputerCompatible With: for UNO R3color:BlueMaterial:PCBPackage Contents:1 x Development BoardOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.