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Arduino Uno USB Microcontroller Rev 3

Product Code : RB-Ard-34

Arduino microcontroller module with USB connection
Wide variety of accessory "Shields" available
It is intended for roboticists, artists, designers and hobbyists
Variety of I/O pins including analog, digital, PWM and more
Based on the ATmega328 (removable DIP IC)
Revision 3

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About this product


Arduino microcontroller module with USB connection
Wide variety of accessory "Shields" available
Intended for roboticists, artists, designers and hobbyists
Variety of I/O pins including analog, digital, PWM and more
Based on the ATmega328 (removable DIP IC)
Revision 3

The Arduino Uno is a microcontroller board based on the ATmega328 microchip. It has 14 digital input/output pins (of which 6 can be used as PWM outputs), 6 analog inputs, a 16 MHz crystal oscillator, 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 1.5m USB Cable Type A to B or power it with an Wall Adapter Power Supply - 9VDC 650mA or DFRobot 7.4V Lipo 2200mAh Battery (Arduino Power Jack) 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 programmed as a USB-to-serial converter. "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 Arduno, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform.

Arduino Uno USB Microcontroller Rev 3- Click to Enlarge

The Arduino Uno can be powered via the USB connection or with an external power supply. The power source is selected automatically. External (non-USB) power can come either from an AC-to-DC adapter (wall-wart) or battery. The adapter can be connected by plugging a 2.1mm center-positive plug into the board's power jack. Leads from a battery can be inserted in the Gnd and Vin pin headers of the POWER connector. The board can operate on an external supply of 6 to 20 volts.

The Arduino Uno can be programmed with the Arduino software. Select "Arduino Uno from the Tools > Board menu (according to the microcontroller on your board). For details, see the reference and tutorials. The ATmega328 on the Arduino Uno comes preburned with a bootloader that allows you to upload new code to it without the use of an external hardware programmer.
Back to top

Supplier Product Code

A000066 Back to top


• Length: 2.7 inches
• Width: 2.1 inches

The USB connector and power jack extend beyond these dimensions.
Four screw holes allow the board to be attached to a surface or case.
Note that the distance between digital pins 7 and 8 is 160 mil (0.16"), not an even multiple of the 100 mil spacing of the other pins. Back to top

Servo Article

Making Robots With The Arduino, Part 1, by Gordon McComb, Servo Magazine November 2010 Back to top


• Microcontroller: ATmega328
• 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 Back to top

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Customer Reviews

It is working well

Review by bnBenjej

It is working well

(Posted on 4/29/15)

Powerful board for a low price

Review by ToastTajMajal

I bought the Arduino board to control two micro servos, and it was so easy to set up and program that I quickly added several other features to my project. Very, very powerful board - and very reasonable priced!

(Posted on 4/27/15)

Must have

Review by Sai-Yu

Beginner or not, a really easy to use and reliable microcontroller.

(Posted on 3/17/15)


Review by Samuel

J'utilise le arduino pour plusieurs projet. Un must !

(Posted on 3/3/15)


Review by Brice

Good product

(Posted on 2/17/15)

Excellent product

Review by David

Wonderful little controller. simple to use and program. care must be taken in the application not to ask it to do too much on a time sensitive process. It is however, only an 8 bit processor. It is perfect for the vast majority of small applications and when protected from external voltage spikes, it has proven to be very reliable over the long term.

(Posted on 1/27/15)

Great product

Review by Marko

Great product, great price.

(Posted on 1/8/15)

Perfect Starter

Review by Craig

Our student group uses these microcontrollers to introduce students to the basics of embedded systems software development and electrical interfacing. It suits the needs of any beginner project!

(Posted on 12/29/14)


Review by Md Rizwanul

Amazing thing for that price

(Posted on 11/5/14)

Love it

Review by Ange

The Arduino Uno is an awesome little microcontroller! It's smaller than I thought it would be.

(Posted on 11/2/14)


Review by William

Greatest of all time. It is user friendly, packed full of features, and versatile. I have no programming experience, and no electronics experience, and I had my prototype up and running within two weeks of coming up with the idea. These ideas aren't going to build themselves, people. GO FOR IT.

Also, robotshop was an excellent experience. Fast shipping, fair price, and authentic as can be. This arduino is my first purchase from them, but I will definitely be back for more.

(Posted on 10/31/14)

Very great micro controller

Review by Alain

The greatest micro controller for the price

(Posted on 10/20/14)


Review by Robert

Great, works just as advertised

(Posted on 10/17/14)

Great Board for getting started

Review by Ted

Well made board. I recommend getting a genuine Arduino board (see website on fakes). Software took some learning but once I got the hang of it I was okay. Enjoyable hobby product.

(Posted on 10/14/14)

Great beginner micro controller

Review by James

This is a great micro controller for beginners as it is simple to use and there is a large resource base to learn from online.

(Posted on 10/5/14)

Great product

Review by TehWan

Good construction, does what it is intended to do. I thought it was possible to change the MCU, but I haven't been able to remove it and dare not to use too much strength either, though it seems possible. Just like any Arduino product, plug and play. Works great, but quite sensitive to short circuits, be careful. I had to plug in an external programmer to save a board.

(Posted on 9/15/14)

Did what it's supposed to do.

Review by Simon

Perfect for small or big project, nice calculating power and easy to use. I recommend it.

(Posted on 8/22/14)


Review by Dardo

Very good product. Works very good.

(Posted on 8/20/14)

an essential and very versatile tool

Review by Kenneth

This Uno brings my total 'duino usage to 10. I use them from LED lighting to a temperature controlled kitten nesting box. This unit was used to monitor power to my heat pump. It is one of three connected to a Raspberry Pi server through USB or FTDI and one connected via Bluetooth.

(Posted on 8/3/14)

a good choice to start

Review by Cristiano

a good choice for rapid prototyping of our projects

(Posted on 7/30/14)

Everything OK quick and accurate! Excellent product ...

Review by Loris

Good price! and the service!

(translated from Italian with Google translate)

(Posted on 7/22/14)

Meets the users needs.

Review by Marina


(Posted on 6/26/14)

Meets the users needs.

Review by Marina

Meets the users needs.

(Posted on 6/26/14)

Highly recommended

Review by Corry

A good board for getting into Arduino programming.

(Posted on 5/8/14)

Great for beginners

Review by Zero

simply a great board to started in robotics

(Posted on 4/23/14)

Very easy microcontroller to get started.

Review by Andrew

With all the examples available for practicing, this board is idea for the first timer or someone getting back into the DIY of robotics. It's size and available accessories makes it a very versatile controller.

(Posted on 4/9/14)