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Arduino UNO R2

3.8 3.8 out of 5 stars 150 ratings
Currently unavailable.
We don't know when or if this item will be back in stock.
Brand Arduino
Model Name UNO R2
CPU Speed 16 MHz
Connectivity Technology USB
Processor Count 1

About this item

  • Clone of Arduino UNO R2 board
  • ATmega328P DIP (Through hole) microcontroller
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PriceCurrently unavailable.$47.00-11% $22.41
Typical: $25.10		$23.36$47.40$45.95
Delivery—
Get it as soon as Wednesday, Nov 27
Get it as soon as Wednesday, Nov 27
Get it as soon as Wednesday, Nov 27
Get it as soon as Wednesday, Nov 27
Get it Dec 3 - 5
Customer Ratings
3.83.8 out of 5 stars150
5.05.0 out of 5 stars6
4.74.7 out of 5 stars996
4.54.5 out of 5 stars32
4.64.6 out of 5 stars26
4.64.6 out of 5 stars173
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Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

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Arduino UNO R2

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Product Description

The Arduino Uno R2 is a microcontroller board based on the ATmega328. 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 USB cable or power it with a AC-to-DC adapter or battery to get started.

Customer reviews

3.8 out of 5 stars
150 global ratings

Customers say

Customers find the single board computer easy to use, fun, and functional. They mention it works great for quickly building small electronic projects. Some appreciate the value for money, saying it's amazing for the price. They also like the build quality, software quality, and possibilities.

AI-generated from the text of customer reviews

Select to learn more
Ease of useFunFunctionalityValue for moneyLooksBuild qualitySoftware qualityPossibilities
38 customers mention "Ease of use"35 positive3 negative

Customers find the programming environment of the single board computer extremely easy to use. They mention there's lots of online instructions and resources, and it's plug-and-play. Customers also say the documentation on the website is superb and the software is a quick download. They also mention it's an excellent prototyping tool and has lots of code examples to draw from.

"...USB or external power with sockets for both already on-board. Very much plug and play, especially if you download the IDE from the Arduino..." Read more

"...The thing I like about this board is it makes it easy to upload the programming from your PCright to the chip using a usb cable...." Read more

"...The web site contains a lot of information and tutorials and made it easy to learn to use the tool to run servos and get input from a variety of..." Read more

"...the Arduino platform and the UNO in particular is an excellent way for the average hobbyist to get involved with microcontrollers for the first time...." Read more

37 customers mention "Fun"37 positive0 negative

Customers find the single board computer fun. They mention it's awesome for getting into microcontroller programming and circuits. Some say it's a great platform for the little projects they do all around the house.

"...Summary: A great little microprocessor board for the hobbyist or professional with an excellent online support system with lots of examples and..." Read more

"...This chip is simply amazing, and the fact that it is open source means that you can develop your applications on it, and then take the schematic of..." Read more

"...The best parts about the Arduino is the sheer amount of information you can find on the web about it, and the number of shields (Expansion boards)..." Read more

"...The site has an appealing GUI and the font isn't retina scarring so reading about each project is relaxed and less life-less...." Read more

21 customers mention "Functionality"18 positive3 negative

Customers like the functionality of the single board computer. They mention it works great, works perfectly with Arduino programming software, and is overly surprised with its capabilities. It works well for quickly building small electronic projects that need some smarts. Some say it's a lot of fun and allows all scripts to run flawlessly.

"...It worked flawlessly once I remembered to install the drivers on my Win 7 64-bit system per the online Quick Start instructions...." Read more

"...I needed a package that was small, yet powerful, low cost, yet high functionality, and low power, yet good processing speed...." Read more

"...be capable of more advanced functions, but I've been overly surprised with it's capabilities...." Read more

"...Works perfectly with Arduino programming software." Read more

14 customers mention "Value for money"14 positive0 negative

Customers appreciate the value for money of the single board computer. They mention it's amazing for the price, the software is open source and available for free from the Arduino.cc site, and it's one of the cheapest microcontrollers out there.

"...for my car, so I needed a package that was small, yet powerful, low cost, yet high functionality, and low power, yet good processing speed...." Read more

"...with the Uno since it's advertised as the "starter" board and the price was right...." Read more

"...The software is open source and available for free from the Arduino.cc site. There's lots of online instructions and resources...." Read more

"Appears to be an R1, but the price is right, and it shipped fast...." Read more

11 customers mention "Looks"11 positive0 negative

Customers like the appearance of the single board computer. They say it's nice looking, cool, and the sections labels are well-placed.

"...I've upgraded to Visual Studio 10 and it looks awesome, but intimidating...." Read more

"I don't see why this is in the toy section, it is pretty cool if you know what your doing...." Read more

"...It's something totally unnecessary, but looks very nice, and gives the impression of a well-made product." Read more

"Very nice. Nice product, good price. :)" Read more

9 customers mention "Build quality"9 positive0 negative

Customers are satisfied with the build quality of the single board computer. They mention it's durable, reliable, and resilient to any wiring mistakes.

"...It's super easy to use and has so far been very resilient to any wiring mistakes I've made...." Read more

"...It's reliable, easy to program, and while mine now has a few dents and dings from being hauled around tossed into a kit of miscellaneous tools of..." Read more

"...The drivers are kept up to date, the software available for it is robust and this thing can do darn near anything you can think of." Read more

"...This board is Excellent & High Quality. I bought 2 Uno's and I was able to plug in both and test it in less than 10 mins...." Read more

9 customers mention "Software quality"9 positive0 negative

Customers are satisfied with the software quality of the single board computer. They mention the available software libraries are excellent, and the software is open source. Customers also appreciate that the device comes with example programs and no development software purchase is required. They say it's a generic application tool to program a whole bunch of ATMEL parts.

"...This chip is simply amazing, and the fact that it is open source means that you can develop your applications on it, and then take the schematic of..." Read more

"...It is a generic application tool to program a whole bunch of ATMEL parts...." Read more

"...This device and its open-source hardware community allows a single person to worry about design and not have a team of people on hand in order to..." Read more

"...The software is open source and available for free from the Arduino.cc site. There's lots of online instructions and resources...." Read more

8 customers mention "Possibilities"8 positive0 negative

Customers are satisfied with the possibilities of the single board computer. They mention it has a variety of applications and expansion possibilities. Some say it comes with lots of examples and has plenty of capacity for home automation projects.

"...It comes with alot of examples also, one of the most popular is the blinking of a led...." Read more

"...will last, or what it's duty cycle is, but it has plenty of capacity for home automation projects too." Read more

"...The possibilities are pretty much unlimited, and support out on the net is great...." Read more

"...It has a variety of applications that don't seem to end!..." Read more

BUYERS: This product is SMD version, not socketed version!
5 out of 5 stars
BUYERS: This product is SMD version, not socketed version!
Arduino is awesome, and I'm psyched to start some cool new projects with my Uno.NOTE TO BUYERS: This listing is for the Arduino Uno SMD edition, meaning the microcontroller is surface mounted, rather than socketed (as is shown in the product image). Both the socketed and SMD edition are functionally identical, with one difference:if you want to use the Arduino Uno board to program an Arduino Mini board (without having to additionally buy the Mini USB/Serial Adapter), you can simply remove the socketed chip and run jumpers to the Mini. But with the SMD version, you can't remove the socketed chip to do this.
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Top reviews from the United States

W. H. Blohm
5.0 out of 5 stars Great little microprocessor board
Reviewed in the United States on August 28, 2011
Verified Purchase
I was looking for an intervalometer for my camera online when I came across many references to the Arduino being used for all sorts of things, including intervalometers. Looking into the Arduino, I found there was a huge online community with plenty of tutorials, examples, and forums. Doing my homework, I knew this would be just the board but I already had everything else anyway, so I bought the Arduino Uno.

When it finally arrived I'd already downloaded and installed the Arduino IDE, so all I had to do was open the box, plug in the USB printer cable I had, and watch it come to life and start blinking, just as described in the Quick Start I found online. Firing up the Arduino IDE, I loaded the Blink example included and uploaded to the Uno. It worked flawlessly once I remembered to install the drivers on my Win 7 64-bit system per the online Quick Start instructions.

I then wrote my own "mandatory" Hello World first program in about 10 minutes, uploaded it to the board, and it worked: flashed "Hello World" in Morse using the on-board LED. (NOTE: it's not mandatory that you do this, I'm just joking about how programmers always write a Hello World program as their first program for a new system or language.)

Over the weekend I've played with it and created more little programs (called sketches in Arduino-speak) and even painlessly interfaced it to a LCD display. I've got lots of ideas for this board beyond the intervalometer for my camera, so I fully expect to buy at least one more eventually.

Summary: A great little microprocessor board for the hobbyist or professional with an excellent online support system with lots of examples and tutorials. Interfaces well with external circuitry through on-board headers and sockets. USB or external power with sockets for both already on-board. Very much plug and play, especially if you download the IDE from the Arduino website.
Only gotcha: you must remember to install the drivers so the Windows OS recognizes it but the instructions to do so are clear in the online Quick Start.
4 people found this helpful
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P. Sorornejad
5.0 out of 5 stars Amazing! Simply Amazing!
Reviewed in the United States on December 20, 2011
Verified Purchase
As a computer engineer I have been using a LOT of development boards ranging from Spartan to Basys, to digilent boards. A lot of them have been great boards, but after dealing with various programming languages and bulky hardware, I wanted to put my hands on a smaller, more modern board.

I was turned onto this board by a review site. They actually did a review on the sister of this board, the Duo, but they are almost the same as far as functionality. I had an idea to work on a project for my car, so I needed a package that was small, yet powerful, low cost, yet high functionality, and low power, yet good processing speed. This board definitely caught my eye, especially the fact that you could use the C-like programming language to develop your applications.

My project deals with the CANBUS, so I was ready to order parts to create a "shield" to place on top of the board via its I/O connectors, when someone turned me onto this AMAZING site called sparkfun[dot]com. They have shields for EVERYTHING, and I was pleased to find that someone had already developed a shield that sends and receives messages via the CANBUS (that wasn't using those cheapo ELM chips). Not only was I able to create my project with ease and minimal custom parts, but on top of that I was able to branch out and tack on a bluetooth board and some SD Logging code.

This chip is simply amazing, and the fact that it is open source means that you can develop your applications on it, and then take the schematic of all the parts you used, import them into an application like Eagle, and develop your own board.

If you are looking to develop a project, have a need for a device that does some inputs and outputs, as well as analog and digital processing, this is where you need to start! The user community is HUGE and the sparkfun and arduino.cc forums are very active.
2 people found this helpful
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Jon B
4.0 out of 5 stars Awesome for getting into microcontroler programming and circuit design
Reviewed in the United States on December 10, 2011
Verified Purchase
Well I bought this board cause Iv always wanted to design some circuit that did something.
Iv always been into programming and know languages like vb6,asp, JavaScript, action-script,xml,c# and so. The thing I like about this board is it makes it easy to upload the programming from your PC
right to the chip using a usb cable. It only has 32k of flash memory and that was a concern I had when going to buy it. However iv made some decent sized programs for it and circuit designs and still only used maybe 5k. SO if your new to this, this thing does have alot of space for a decent sized program to run.

The programming is done with the Arduino IDE. It is using a C like subset language and is very easy to catch on if you have done any kind of programming before. It comes with alot of examples also, one of the most popular is the blinking of a led. The day I got it iv taking the blink example and was able to alter it to my needs and understand this new environment. I bought this about 1 month ago and now iv moved to using shift registers, sensors, resisters, diodes, and on and on, All of which I had no ideal what they where, but with some searching on these components iv learned alot how I can use them with my new arduino board.

Also if your a C /C++ programmer already then you can write your own libs to use with the arduino IDE. Theres a huge group of people on the playground site that will offer advice,ideals and share there code with you. This is a great way for anyone who has an intrest in electronic and programming. Become a Software/Hardware Engineer.

The only cons I have for this is the price, wile it wont break you to spend $30
you can build the same board for around 8, however you wont have the usb interface.
Alot of people buy this board to start and then in a finished design they build
a more compact/cheeper board to use. There is just a ton of info on this hardware and it
is really a great learning tool for anyone.
One person found this helpful
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