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ATMEGA328 UNO R3 Development Board - Blue + Transparent
A product for Arduino that works with official Arduino boards; - More pins: 2 more I2C pins are added by the side of AREF pin (SDA and SCL£¬ copies of Analog 4 and 5£¬ not extra I2C interfaces); Moreover£¬ 2 more other pins are also added by the side of RESET£¬ one is IOREF£¬ which enables the expansion board to adapt to the on-board voltage (just tell you the current on-board voltage)£¬ and the other one is a stand-by occupied pin; - More stable RESET circuit: The RESET has been moved to the board corner£¬ near to the USB interface£¬ which is more convenient to use; - ATmega16U2 replaces 8U2£¬ but this doesn't mean that the R3 with 16K flash can make your code run faster£¬ it is just updated to serve for the USB interface chip. In theory£¬ this update allows UNO to simulate USB HID£¬ such as MIDI / Joystick / Keyboard.