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Atmega16U2 instead 8U2. This update services for USB interface chip. Theoretically£¬ UNO can simulate USB HID£¬ such as MIDI / Joystick / Keyboard; 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; More stable RESET circuit. The RESET key position has changed£¬ has been moved to the corner near the USB interface board£¬ more convenient and press.