Arduino Uno Rev. 3 Microcontroller Board

Arduino Uno Rev. 3 microcontroller development board is based on the Atmel ATmega328 MCU.
The Arduino Uno has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16MHz crystal oscillator, a USB connection, a power jack, an ICSP header, and a reset button.
This Arduino MCU board contains everything needed to support the microcontroller. Simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.
The Arduino Uno differs from other development boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega8U2 programmed as a USB-to-serial converter.
The Arduino Uno MCU board can be powered via the USB connection or with an external power supply. The power source is selected automatically.


Arduino Uno Features


  • Powered via USB connection or external power supply
    – with power source selected automatically
  • External (non-USB) power from an AC-to-DC adapter
    (wall-wart) or battery
  • Operates on external supply of 6 to 20V (7-12V recommended)


  • 32KB flash memory (with 0.5KB used for the bootloader)
  • 2KB SRAM

Input and Output

  • 14 digital pins that can be used as an input or output
  • 6 analog inputs, each of which provides 10 bits of resolution
    (i.e. 1024 different values)

Physical Characteristics

  • Max PCB length and width of 2.7in and 2.1in
  • USB connector and power jack extend beyond PCB


  • Designed to communicate with a computer,
    another Arduino, or other microcontrollers
  • ATmega328 provides UART TTL (5V)
    serial communication
  • On-board ATmega8U2 channels serial communication over USB
  • ATmega328 supports I²C (TWI) and
    SPI communication


  • Can be programmed with Arduino software
  • ATmega328 comes preburned with bootloader
    for uploading new code without external
    hardware programmer
  • MCU can be programmed through ICSP
    (In-Circuit Serial Programming) header

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