Product Category: Integrated Circuits
Product Type: UNO R3 Development Board
Chip: ATEGA328P-AU, Official Arduino MEGA328P
Clock Speed: 16Mhz
Connectivity: USB Cable included
Board weight: 28 grams
Line weight: 19 grams
Size: 68.5mm * 53.7mm * 12.5mm

Operating Voltage 5V
Input Voltage (recommended) 7-12V
Input Voltage (limits) 6-20V
Digital I/O Pins 14 (of which 6 provide PWM output)
Analog Input Pins 6
DC Current per I/O Pin 40 mA
DC Current for 3.3V Pin 50 mA
Flash Memory 32 KB (ATmega328) of which 0.5 KB used by bootloader
SRAM 2 KB (ATmega328)
EEPROM 1 KB (ATmega328)
Clock Speed 16 MHz

Function:

Pin change: Two I2C pins (SDA and SCL, just copy of Analog4 and 5, not extra 12C interface) are added next to AREF pins. In addition, two pins are added next to RESET, one is IOREF, which allows the expansion board to use the onboard voltage. This pin only tells the expansion board what the current onboard voltage is (for example, UNO is 5V, which can be regarded as copy of power pins, but does not provide flat pull-up). The other pin is to be used later.

A more stable REST circuit. The RESET key position has also changed, and it has been moved to the corner of the board near the USB interface, which is more convenient to press.

ATmega16U2 replaces 8U2, which doesn't mean that R3 with 16k flash can make your code run faster. This update is a USB interface chip service, which theoretically allows UNO to simulate USB HID, such as MIDI/Joystick/Keyboard.

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