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Arduino Uno Rev 3

532 customer reviews
| 7 answered questions

List Price: $79.99
Price: $19.95 & FREE Shipping on orders over $35. Details
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  • ATmega328 microcontroller
  • Input voltage 7-12V
  • 14 Digital I/O Pins (6 PWM outputs)
  • 6 Analog Inputs
  • 16Mhz
32 new from $8.05 2 used from $14.69
$19.95 & FREE Shipping on orders over $35. Details In Stock. Sold by Mp3Car Store and Fulfilled by Amazon.

Frequently Bought Together

  • Arduino Uno Rev 3
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  • Wall Adapter Power Supply - 9V DC 650mA
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  • Sunfounder Project Super Starter Kit for Arduino UNO R3 Mega2560 Mega328 Nano
Total price: $60.94
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Product Description

The Arduino Uno Rev3 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 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. The Uno differs from all preceding 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."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. 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 of which 0.5 KB used by bootloader SRAM 2 KB EEPROM 1 KB Clock Speed 16 MHz

Product Details

  • Product Dimensions: 3 x 0.8 x 2.5 inches ; 1.4 ounces
  • Shipping Weight: 1.4 ounces (View shipping rates and policies)
  • ASIN: B008GRTSV6
  • Item model number: A000066
  • Average Customer Review: 4.4 out of 5 stars  See all reviews (532 customer reviews)
  • Amazon Best Sellers Rank:
  • Product Warranty: For warranty information about this product, please click here
  • Date first available at December 2, 2011

Customer Reviews

Most Helpful Customer Reviews

123 of 129 people found the following review helpful By Metals Geek on December 27, 2011
Verified Purchase
GOOD: This is indeed the Rev-3 UNO board with the reset button in the upper left corner. It arrived very quickly and seems to work well so far. My C-language test "sketches" (apps) downloaded and ran on the first attempt, using the version 1.0 software download. The components and PCB appear cosmetically to be of reasonably good quality, but ...

BAD: The soldering workmanship is very disappointing; the worst I've ever seen in a production job. SMT devices on the top seem to be mounted OK, but the bottom of the board had numerous defects in the (wave?) soldering. Two of these joints appear to have been manually touched up (residual flux present). Several other joints had large gaps in cold solder joints, but were apparently not bad enough to warrant manual repair. I hope the Italian manufacturer (SMART PROJECTS) works out these process kinks soon.

*** UPDATE July 2012 *** My subsequent purchase of an UNO-R3 board indicates that the soldering issues in early production boards have been solved. (FYI, CanaKit is an approved distributor for Arduino.)

The Arduino concept is terrific, and has enabled a LOT of people to easily create smart projects. The C compiler and IDE work well; I've never had an easier time writing an embedded application, and the price can't be beat. The only thing lacking is the ability to debug code via single-step.
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88 of 96 people found the following review helpful By J. Lawler on December 15, 2012
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I bought mine through in Dec 2012 (sold by Silverstone LLC) and it was definitely not an authentic Arduino. Some kind of fairly-thorough knock off-- I posted a few pictures comparing it to an actual Arduino-brand UNO R3 board.

And on top of that, it wouldn't work when I plugged it in.

Be careful! You're better off buying through a site like Sparkfun or Adafruit.
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49 of 56 people found the following review helpful By glitchscience on January 24, 2012
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This is the best price I could find for an Authentic Arduino R3 on the web.
Plus Free Super Saver Shipping through Amazon makes it an even better deal.

It is a genuine Arduino R3 Made in Italy.
Appears to be a high quality build. Soldering looks perfect.
Screen print on the board identifying I/O connections is excellent and easy to read.
For that matter all of the screen printing looks great.
Latest version. Uses the ATMEGA328P.
Tested and works just as it should!

Comes packaged in a colorful little box. Includes small folded booklet with statements regarding manufacturing, testing, packaging & environmental impact, certificate of origin, warranty information, etc..
Also includes 6 open source and arduino round logo stickers.

What more can be said? It is open source and there are tons of projects that can be found online
With lots of information detailing how to put the projects together.
My opinion is it is one of the best platforms to learn on and great for all skill levels really.
Overall great purchase. Open source is the way to go.

Update: The Arduino Uno R3 I reviewed was purchased through Amazon from the seller NKC Electronics
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15 of 15 people found the following review helpful By Shelly Hockett on July 14, 2015
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Board is clearly counterfeit when compared against the official ones on They have a section for identifying counterfeit boards, and this board is junk. While I understand that arduino is an open source thing, printing on the back (to look official) and delivering substandard parts is bullcrap. I paid a premium for the official board, and it was NOT delivered. Things to note in the photographs: The "A" in arduino is filled in, the font (especially the "O") in Uno is different, and Italy has no detail to it. All are pointing to an inferior product, and being counterfeit by the official site.
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30 of 34 people found the following review helpful By ManojK on March 20, 2012
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Regarding the board:
Seems very well constructed and genuine to me.
I used a spare USB cable and hooked it to a laptop with WindowsXP. Downloaded the software from [...] followed the instructions for WindowsXP and within minutes the 'Blink' sketch was up and running. Had same (smooth) experience on the iMac, in fact with less number of steps (no driver installtion step).
With few LEDs, an 8 Ohm mini-speaker, few resistors and under half an hour I had couple of 'sketches' tried and tested already. My kids are now super-interested in electronics after enjoying the sweeping LEDs and interesting tones and of course the appealing Ardunio R3 board! I let my daughter change the delay intervals in a 'sketch' and she was so glad to see the effect right away.

Bottom line: After running some sample sketches and my own programs - the board seems to be functioning well.

Regarding the Arduino concepts:
1. I absolutely love the simplicity of the development environment (IDE). You can truly jump into the interfacing and control aspects of a microcontroller device without getting bogged down by its internals, assembly instructions and potentially complex program download steps.
2. This is a great learning tool to introduce yourself to the embedded software and the base hardware.
Arduino R3 is probably one of the cheapest development boards out there yet very effective.
Only other board I have had a chance to play with is the Atmel AVR Butterfly (which costs around $20) but the overall development setup is definitely more complex.

So in case you have even a 'tiny bit' (no pun intended) of interest in the vast world of microcontrollers and electronics in general - go ahead and try this board.

Note: Related purchase (from Amazon) which helped me a lot is - the book 'Programming Arduino' by Simon Monk.
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