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Arduino Uno REV3 [A000066] – ATmega328P Microcontroller, 16MHz, 14 Digital I/O Pins, 6 Analog Inputs, 32KB Flash, USB Connectivity, Compatible with Arduino IDE for DIY Projects and Prototyping

4.6 out of 5 stars 9,191 ratings
Price: £30.34
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Size Name: Arduino UNO R3
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Purchase options and add-ons

Brand Arduino
Model name 840577
RAM memory installed size 0.2 MB
Memory storage capacity 32 KB
CPU speed 16 MHz

About this item

  • ATmega328P Microcontroller: Powered by the reliable ATmega328P, running at 16 MHz with 32KB of flash memory, 2KB SRAM, and 1KB EEPROM, offering ample resources for a wide range of basic to advanced electronics projects.
  • 14 Digital I/O Pins & 6 Analog Inputs: Features 14 digital I/O pins (6 of which support PWM output) and 6 analog inputs (10-bit resolution), providing flexible options for sensors, motors, and other external components.
  • USB Connectivity for Easy Programming: The built-in USB port allows for direct programming and serial communication, enabling a simple connection to your computer for sketch uploading and debugging through the Arduino IDE.
  • Compatible with Arduino IDE: Full compatibility with the Arduino IDE ensures easy access to a vast array of libraries, code examples, and community-driven projects, making the Uno a great choice for both beginners and experienced makers.
  • Widely Used in Education & Prototyping: The Arduino Uno is a standard in educational environments, widely used for learning and teaching electronics and programming. It's perfect for prototyping, robotics, IoT projects, and more.
› See more product details
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Product Safety

This product is subject to specific safety warnings

  • Warning:Not suitable for children under 14 years. For use under adult supervision

From the manufacturer

Overview

Arduino Uno is the ideal board for getting started with electronics, through fun and engaging hands-on projects. This board is your entry to the unique Arduino experience: great for learning the basics of how sensors and actuators work, and an essential tool for your rapid prototyping needs. Arduino Uno Rev3 is the most used and documented board in the Arduino family. Thanks to the lively and helpful community surrounding the Arduino Uno, no one will find themselves without support.

Technology

Arduino Uno Rev3 is a microcontroller board based on the ATmega328P, an 8-bit microcontroller with 32KB of Flash memory and 2KB of RAM. 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.

Buying Options
Customer Reviews
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Price — no data
Microcontroller ATmega328P
Operating voltage 5v
USB 14
Digital I/O Pins 6
Analogue Input Pins 6
Flash Memory 32 KB
SRAM 2 K
EEPROM 1 K
Clock Speed 16 MHz
Length 68.6 mm

What's in the box?

  • USB cable.

    • Product details

    • Batteries ‏ : ‎ 1 9V batteries required.
    • Is discontinued by manufacturer ‏ : ‎ No
    • Product Dimensions ‏ : ‎ 8 x 5.51 x 2.49 cm; 31.75 g
    • Date First Available ‏ : ‎ 8 May 2011
    • Manufacturer ‏ : ‎ Arduino
    • ASIN ‏ : ‎ B008GRTSV6
    • Item model number ‏ : ‎ A000066
    • Guaranteed software updates until ‏ : ‎ unknown
    • Customer reviews:
      4.6 out of 5 stars 9,191 ratings

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    Important information

    Legal Disclaimer

    Board works perfectly. No USB cable or power supply is included (USB cable is standardised and power supply not required), so it is not included. The product is returned in the original packaging, packed in a large letter, and sent the day after ordering (except Sunday). I accept no responsibility for shipping damage or damage caused by them.

    Energy efficiency class

    A++_TO_A+

    Energy consumption

    0.1 Kilowatt Hours Per Year per year, based on the power consumption of the television operating 4 hours per day for 365 days. The actual energy consumption will depend on how the television is used.

    Visible screen diagonal

    2" / 4 cm

    Customer reviews

    4.6 out of 5 stars
    9,191 global ratings

    Review this product

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    Customers say

    Customers find this Arduino board to be a brilliant piece of kit that works well and is easy to learn, making it a fantastic way to combine their favorite hobbies. Moreover, they appreciate its genuine Italian-made quality, high build quality, and consider it worth the price. However, the board comes without a USB cable, which customers find inconvenient.

    Select to learn more

    ElectronicsFunctionalityEase of useArduino qualityFun to useValue for moneyBuild qualityCable compatibility
    50 customers mention ‘Electronics’50 positive0 negative

    Customers describe this single board computer as a brilliant piece of kit and great little gadget, with one customer noting it's particularly useful for learning electronics.

    "Great little device that is capable of much more than I am able to code. There are plenty of books or resources online to get you going." Read more

    "Great piece of kit and lots of fun working with it" Read more

    "A wonderful piece of electronic engineering." Read more

    "Never a better £25 spent. So versatile and so much fun to use...." Read more

    39 customers mention ‘Functionality’39 positive0 negative

    Customers find that the Arduino Uno works well and is incredibly useful, with one customer specifically noting its compatibility with the Arduino programming environment.

    "Works perfectly and does everything it needs to...." Read more

    "Great product...." Read more

    "...Already used it for a few projects and works great. You will need a few components to get the best out of it but they are not expensive." Read more

    "The swiss army knife of electronics. The Arduino Uno is an incredibly useful and versatile bit of kit." Read more

    36 customers mention ‘Ease of use’34 positive2 negative

    Customers find the Arduino Uno easy to use, with code that is simple to learn, and one customer notes that it combines hardware and software effortlessly.

    "...Easy to program and the code is easy to learn as well." Read more

    "...The important thing to remember with the Arduino is that it is easy to use...." Read more

    "...It's really easy to use and is a good starting point for the Arduino ecosystem...." Read more

    "...Super Easy to Get Started – I was up and running in no time, even as a beginner...." Read more

    24 customers mention ‘Arduino quality’17 positive7 negative

    Customers appreciate the quality of this Arduino board, noting that it is genuine and Italian-made.

    "Genuine Arduino..." Read more

    "...This is (was) apparently a genuine Arduino although these days it's pretty near impossible to tell one way or the other...." Read more

    "The UNO I received was not a genuine Arduino...." Read more

    "...It is built to a high quality, and being built in Italy it's ethical...." Read more

    21 customers mention ‘Fun to use’21 positive0 negative

    Customers find the Arduino Uno REV3 fun to use, particularly as a fantastic way to combine their favorite hobbies and for learning.

    "Fantastic way to combine my favourite hobbies, making things & programming! Easy to develop for if you know any C++ based languages." Read more

    "...Great for learning or just for the fun." Read more

    "...a multimeter etc, but it won't cost the earth and it will enable you to MAKE things...." Read more

    "Good for experimenting" Read more

    21 customers mention ‘Value for money’21 positive0 negative

    Customers find the Arduino Uno to be well worth its price.

    "...Delivery of the board was excellent and a great price as well." Read more

    "...it's compatible with a wide range of components and is excellent value for money." Read more

    "Worth getting the official uno I think, well built with a nice clear plastic base." Read more

    "Arduino is a platform worth investing if electronics is your thing...." Read more

    15 customers mention ‘Build quality’15 positive0 negative

    Customers praise the build quality of the Arduino Uno, describing it as very high quality and reliable, with one customer noting its beautifully crafted electronics.

    "Good quality & arrived promptly" Read more

    "The official, Italian-made Arduino. Very high quality and nicely packaged." Read more

    "...The build quality is solid, and the socketed processor makes it really easy to replace...." Read more

    "...looks like welldesugned and built but no documenrstion of any sort was supplied. .usage and applicatiin us virtyally imoossible." Read more

    10 customers mention ‘Cable compatibility’0 positive10 negative

    Customers report issues with cable compatibility, noting that the board comes without a USB cable and requires a non-standard USB connection.

    "This doesnt come with USB cable so if you dont have an A - B usb cable you will need to buy one" Read more

    "Should be clearer, its not a standard USB needed. You'll need a b-male lead. 3 stars for lack of clarity, will update further on lifespan" Read more

    "...no cable, but was clearly specified." Read more

    "...Proper little box with some notes and stickers but no USB lead...." Read more

    Accurate
    5 out of 5 stars
    Accurate
    I like this ARDUINO, it is made very accurate
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    Top reviews from United Kingdom

    • Aprocryphan
      5.0 out of 5 stars Great for intro to Arduino Ecosystem
      Reviewed in the United Kingdom on 4 May 2025
      Size Name: Arduino UNO R3Verified Purchase
      The UNO R3 is a great tool for getting an introduction to electronics. It's really easy to use and is a good starting point for the Arduino ecosystem. it's compatible with a wide range of components and is excellent value for money.
      Helpful
       Report
    • Big Ben
      5.0 out of 5 stars The genuine article, and it Just Works - wonderfully!
      Reviewed in the United Kingdom on 4 September 2012
      Verified Purchase
      If you are reading this review, chances are you might know what an 'Arduino' board is intended to do.

      But just in case you do not - it's a tiny 'embedded' computer. The sort of thing you might find in a prize-winning maze running robot, or a walking robot, or a fabricator machine, or a smart GPS, or (in my case) a musical instrument.

      It's called 'embedded' because the computer is part of the machine, rather than sitting on a desk top (or lap top). Often there is no display other than a few blinking lights - sometimes a small LCD, or more rarely a full-on computer monitor.

      That's because the pins on the Arduino's processor are mostly I/O lines (Input/Output) and they are typically used to scan push buttons or sensors, or something on a daughter-board (called an Arduino 'shield') that has something else on it. My favourite shield has a Ronin 802 musical instrument synthesiser on it. Then the outputs are used to flash an LED, or play music, or pretty much anything that electronics can do.

      The important thing to remember with the Arduino is that it is easy to use. I just hooked up the USB lead, downloaded & installed the free software (which comes with demo examples) configured it to talk to an Arduino Uno (this model) and loaded the first 'sketch' (Arduino name for a program) from the examples, starting with the one called 'blink' (pretty easy to read and understand), and clicked on the upload icon. Bingo! The LED on the Arduino was blinking, once every second.

      Blinking is not a really big deal.

      But it's great for helping any newcomer to Arduino code understand what it does, and how. Rather than read a gazillion books, I was just tweaking the example code (blinking slower, eg) at first. It's pretty easy to pick up - I only started on it in January this year, and this is our third Arduino..... Yes, it's habit-forming. But if you like puzzles, puzzling out code design and then making something all your own is a truly wonderful feeling.

      And there are now thousands of 'sketches' free to download to make it do all sorts of things from music synthesis to an electric spider.... Have a look on You-Tube!

      It's an Arduino, it's wonderful, and at under 20 quid I recommend it to anyone who's curious, or who has a curious child around.
      79 people found this helpful
      Helpful
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    • Alex R.
      5.0 out of 5 stars Arduino Uno: The best starter board (ever!!)
      Reviewed in the United Kingdom on 1 February 2025
      Size Name: Arduino UNO R3Verified Purchase
      I’ve been using the Arduino Uno for a while, and I think it’s fair to review it now.
      Here we go:

      Why I Love It:
      1) Super Easy to Get Started – I was up and running in no time, even as a beginner. The Arduino IDE is simple, and there are endless (literally!) tutorials to follow online.

      2) Huge Community Support – Anytime I hit a roadblock, I found a solution online. The community is massive, and that makes troubleshooting way easier.

      3) Endless Possibilities – I’ve built everything from simple LED animations to a real-time dashboard for sensor readings. The fact that you can combine hardware and software so effortlessly is what makes this so exciting.

      A Few Downsides:
      1) No Built-in WiFi or Bluetooth – I had to get extra modules for that, but honestly, at this price, I can't complain.

      2) Limited Memory – It’s great for small to mid-sized projects, but if you're doing something complex with a ton of data, you might need a bigger board like the Arduino Mega.

      Final Thoughts:
      If you're into DIY, electronics, coding, or just love building stuff, the Arduino Uno is a must-have. And if you pair it with Processing (free GUI gui software) , like I did, you can build some seriously cool projects. Highly recommend!
      One person found this helpful
      Helpful
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    • Mr SEAN REILLY
      4.0 out of 5 stars A board full of wonder (and electronics).
      Reviewed in the United Kingdom on 10 July 2015
      Size Name: Arduino UNO R3Verified Purchase
      I would give it 5 stars, but the box mine came in had clearly been tampered with. The board was fine and nothing was missing, but I would expect better from Amazon.

      This board is a fantastic choice for beginners, as it includes lots of pins and most beginner tutorials use it. There are also some full kits available that include the board along with a collection of electronic components (resistors, capacitors, cables, sensors, segment displays, and so on), and most of them include a project book and everything you need besides a PC, so that's another choice for the beginner (I would imagine children would enjoy playing and learning with that). On top of that, there are a bunch of expansion boards available designed for the Arduino Uno, so you might want to look into that.

      Please be aware that there are smaller and larger Arduino boards available. This is a good starter board, but I have been using Arduino Nanos (about four quid on Ebay) that are just as easy to use, but smaller and far cheaper, meaning that I can break them without too much worry. I would avoid the Digispark boards - they are kinda dodgy in my experience, require special software, and apparently they can break easily.
      2 people found this helpful
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    • Editor
      5.0 out of 5 stars Great microcontroller point for beginners
      Reviewed in the United Kingdom on 4 April 2025
      Size Name: Arduino UNO R3Verified Purchase
      The Arduino Uno is a great tool for learning how to use microcontrollers. It isn't the fastest or the most capable, but it's simplicity, versatility and ease of use is what sets it apart. The provided software is filled with loads of free examples and well documented code libraries. The build quality is solid, and the socketed processor makes it really easy to replace. Would definitely recommend to a beginner who wants to get into elecrronics projects!
      Helpful
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    • G.R C.
      5.0 out of 5 stars Ardinuo
      Reviewed in the United Kingdom on 11 June 2025
      Size Name: Arduino UNO R3Verified Purchase
      Excellent
      Helpful
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    • Dan
      5.0 out of 5 stars workhorse
      Reviewed in the United Kingdom on 19 February 2025
      Size Name: Arduino UNO R3Verified Purchase
      still going strong many years later, adored
      Helpful
       Report

    Top reviews from other countries

    Translate all reviews to English
    • Amazon Customer
      5.0 out of 5 stars SATISFEITO
      Reviewed in Brazil on 31 October 2024
      Size Name: Arduino UNO R3Verified Purchase
      TUDO OK COM O ITEM
      Report
    • schmitt
      5.0 out of 5 stars Nickel
      Reviewed in France on 26 June 2025
      Size Name: Arduino UNO R3Verified Purchase
      Super produit
      Report
    • ENG.Bader
      5.0 out of 5 stars It’s great product, original green ATML329
      Reviewed in Saudi Arabia on 11 August 2022
      Size Name: Arduino UNO R3Verified Purchase
      ATML iC programbel chep , it’s all about it, green or blue, doesn’t mean anything

      Bay it as it’s ATML
      Report
    • Milan
      4.0 out of 5 stars Ok
      Reviewed in Sweden on 9 July 2022
      Size Name: Arduino UNO R3Verified Purchase
      Ok
      Report
    • MrG
      5.0 out of 5 stars Worth buying
      Reviewed in the United Arab Emirates on 11 January 2021
      Size Name: Arduino UNO R3Verified Purchase
      Pros. Good quality

      Cons. None
      Report