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Arduino Uno Rev3

by Arduino
The Arduino UNO is the most used board in the family of Arduino boards.  If you are starting out with Arduino, this is the board to get.
Gross Weight: 0.05kg
Warranty: 2 Year Manufacturer Warranty
Company: Arduino
Part Number: A000066
Made in: Italy
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The Arduino Uno is a microcontroller board based on the ATmega328 (datasheet). It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz ceramic resonator, a USB connection, a power jack, an ICSP header, and a reset button. It 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 Uno differs from all preceding boards in that it does not use the FTDI USB-to-serial driver chip. Instead, it features the Atmega16U2 (Atmega8U2 up to version R2) programmed as a USB-to-serial converter.

The ATmega328 has 32 KB (with 0.5 KB occupied by the bootloader). It also has 2 KB of SRAM and 1 KB of EEPROM (which can be read and written with the EEPROM library).

Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into DFU mode.

Revision 3 of the board has the following new features:

  • 1.0 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. In future, shields will be compatible with both the board that uses the AVR, which operates with 5V and with the Arduino Due that operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
  • Stronger RESET circuit.
  • Atmega 16U2 replace the 8U2.


"Uno" means one in Italian and is named to mark the upcoming release of Arduino 1.0. The Uno and version 1.0 will be the reference versions of Arduino, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform.



  • This is the original board of Arduino Uno.
  • Only the basic Uno board is included in the box, you can find in our catalog USB cable, 12V power supply and everything else you need for your construction.


Operating Voltage:
Input Voltage:
Input Voltage (limits):
Digital I/O Pins:
Analog Input Channels:
PWM Channels:
DC Current per I/O Pin:
20 mA
DC Current for 3.3V Pin:
Flash Memory:
32 KB
2 KB (ATmega328)
1 KB (ATmega328)
Clock Speed:
16 MHz


  • Architecture: AVR
  • Product Code:
    • A000066 (TH)
    • A000073 (SMD)
  • PCB Size: 53.4 x 68.6 mm
  • Weight 25 g


Arduino Uno R3 Unboxing