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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

Description

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 Arduino 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.

Power

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. If supplied with less than 7V, however, the 5V pin may supply less than five volts and the board may be unstable. If using more than 12V, the voltage regulator may overheat and damage the board. The recommended range is 7 to 12 volts.

The power pins are as follows:

  • VIN. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
  • 5V.This pin outputs a regulated 5V from the regulator on the board. The board can be supplied with power either from the DC power jack (7 - 12V), the USB connector (5V), or the VIN pin of the board (7-12V). Supplying voltage via the 5V or 3.3V pins bypasses the regulator, and can damage your board. We don't advise it.
  • 3V3. A 3.3 volt supply generated by the on-board regulator. Maximum current draw is 50 mA.
  • GND. Ground pins.
  • IOREF. This pin on the Arduino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs for working with the 5V or 3.3V.

Memory

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

Back to top

Supplier Product Code

A000066 Back to top

Dimensions

• 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

Specifications

• 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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Reviews

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Customer Reviews

Flexible

Review by William A
General

This was programmed by my son as I am illiterate in C. He had it working in no time and we had no problem at all. I am very happy with it. It resides in my greenhouse and so far the elements have not harmed it.

(Posted on 6/14/15)

Great board, lots of support

Review by Todd
General

I've all 3 generations of the Uno. Basic board at a great price.

(Posted on 6/4/15)

It is working well

Review by bnBenjej
General

It is working well

(Posted on 4/29/15)

Powerful board for a low price

Review by ToastTajMajal
General

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
General

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

(Posted on 3/17/15)

Excellent

Review by Samuel
General

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

(Posted on 3/3/15)

Wonderful

Review by Brice
General

Good product

(Posted on 2/17/15)

Excellent product

Review by David
General

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
General

Great product, great price.

(Posted on 1/8/15)

Perfect Starter

Review by Craig
General

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)

Great

Review by Md Rizwanul
General

Amazing thing for that price

(Posted on 11/5/14)

Love it

Review by Ange
General

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

(Posted on 11/2/14)

G.O.A.T.

Review by William
General

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
General

The greatest micro controller for the price

(Posted on 10/20/14)

Great

Review by Robert
General

Great, works just as advertised

(Posted on 10/17/14)

Great Board for getting started

Review by Ted
General

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
General

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
General

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
General

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

(Posted on 8/22/14)

Excellent

Review by Dardo
General

Very good product. Works very good.

(Posted on 8/20/14)

an essential and very versatile tool

Review by Kenneth
General

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
General

a good choice for rapid prototyping of our projects

(Posted on 7/30/14)

Everything OK quick and accurate! Excellent product ...

Review by Loris
General

Good price! and the service!

(translated from Italian with Google translate)

(Posted on 7/22/14)

Meets the users needs.

Review by Marina
General

Excellent!

(Posted on 6/26/14)

Meets the users needs.

Review by Marina
General

Meets the users needs.

(Posted on 6/26/14)

Highly recommended

Review by Corry
General

A good board for getting into Arduino programming.

(Posted on 5/8/14)

Great for beginners

Review by Zero
General

simply a great board to started in robotics

(Posted on 4/23/14)

Very easy microcontroller to get started.

Review by Andrew
General

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)