Arduino Uno R3 (Revision 3) Microcontroller Board – A000066

(28 customer reviews)

£22.20 inc VAT

Availability: 9 in stock

Brand: Arduino
Part Number: A000066
Barcode: 722301289846
SKU: PPA000066 Categories: , , , , , Tags: , , , , , ,
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Arduino Uno R3 (Revision 3) Microcontroller Board – A000066

The Arduino Uno R3 is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as Pulse Width Modulation (PWM) outputs), 6 analog inputs, a 16 MHz crystal oscillator, a USB connection, a DC 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 an AC-to-DC adapter or battery to get started.

We stock a wide range of plug-in accessory boards (shields), to enable most circuits to be built within minutes.

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 which is configured as a USB-to-serial converter.
Revision 2 of the Uno board has a resistor pulling the 8U2 HWB line to ground, making it easier to put into Device Firmware Update (DFU) mode.

Revision 3 of the board has the following new features:

  • 1.0 pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. Shields will be compatible both with the board that uses the AVR, which operate with 5V, and with the Arduino Due which operates with 3.3V. The second one is a not connected pin, that is reserved for future purposes.
  • Stronger RESET circuit.
  • Atmega 16U2 replace the 8U2.


  • 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

On our YouTube Channel you will find a range of interesting video tutorials. They cover a wide use of Arduino Uno R3 features such as Pulse Width Modulation (PWM), Real-Time Clock (RTC), RGB LED, Serial Monitor, Stepper Motor, Thermal Array, RFID, Data logging, and many more.

Within our Proto-Pic Academy, you will find interesting courses on many of the Arduino features! However, do you have a particular design challenge or coding issue? Then don’t panic, Proto-Pic has a dedicated tech team with many years of experience in programming and building STEM projects that are ready to assist you.

28 reviews for Arduino Uno R3 (Revision 3) Microcontroller Board – A000066

  1. Robbie McIntosh

    I <3 Arduino Uno. This has to be the handiest revision yet!
    Delivered lightning fast as always!

  2. Doug Graham

    Excellent product, good price , quick delivery, courteous service.

  3. Sean Mills

    The second type of board I have used for development purposes. This version is better as it has a socketed processor, so if an accident happens, it can be replaced. It came with a plastic mounting as well that means it can be easily mounted, or saves any shorts occurring when working on the workbench

  4. Simon

    My goto board perfect for any number of project.

  5. Richard

    If you’ve already used an arduino you won’t need to read a review, if you haven’t then buy one from proto-pic (great price and swift delivery) and get started.Simple to learn, extremely versatile and well supported on and offline.

  6. Alex

    Arduinos are always smaller than I think they are and are great value, especially when you conside the large amount of documentation and help around the web.

  7. Ashley Bow

    I am a beginner with AVRs however I found this one very easy to use. It has really enhanced my project i am working on.Also it was delivered very quickly and satisfactorily.Very pleased all round.

  8. Jo

    I bought this for my husband as part of his Christmas. I can’t say that I know what it’s for, but he’s happy, so that’s what matters!I do know that he is currently on a mission to do all sorts of electronic wizardry, and has been busy with something in t

  9. malbro

    Arduino Uno is a useful board at a great price, product build is excellent and easy to get operational, just add power supply and USB cable to start working with the Arduino IDE.Delivery and communications from Proto-Pic were excellent.

  10. Nigel

    It’s been said below but the addition of the printed pin headers is really great and saves you fiddling with the torch in tighter spaces.I’ve been using these for a while and the UNO is a great product, it looks professional, and works like it too.

  11. Daniel

    I’ve been using Arduino’s for years, and the latest addition of the markings on the pin-headers themselves is just an extra bonus. The Uno has always been a flexible and reliable piece of kit for me and has been part of many of my projects.

  12. J

    I am a programmer but have no Arduino or electronics experience. I can however follow a wire diagram. i was persuaded by a friend to buy an Arduino to help him code for a project.The service by proto-pic was exceptional. T

  13. Phil

    Packaging superb, service superb.

  14. Martin J.A

    A handy piece of hardware that I stumbled upon by accident whilst designing and building a Quiz Night Buzzer Kit complete with Bells, Whistles and Lights.The service was prompt and efficient, the Motherboard arrived, undamaged thanks to the secure packaging

  15. Robyn Duck

    Love the Arduino. I use these with children along with a version of Scratch. Clear numbering, easy to connect up and looks good as well.

  16. Dave

    Bought this to use with a music shield and it came 2 day later in a study plastic case to protect it in the post. Great service and price!Arduino itself looks well made and I haven’t found any problems with it yet! There is loads of stuff on the web

  17. Jannetta S

    I bought the Arduino to use in conjuction with a shield that I bought from I’m having great fun and have used this to show students how I can drive a stepper motor with nerve signals from my hand.

  18. Ed Tippelt

    Very pleased with the items I purchased and the speed of delivery. Also impressed with the range of components available.

  19. David Jame

    Although I have some programming experience (from 20 years ago) I had no experience of using a micro controller. But the Arduino online documentation and support community made it easy to get started. I only had to plug in power and USB and the Uno was running

  20. Anthony

    What a fun self-contained product. Already made a beer fermentation controller and anti-boilover controller.

  21. mrglennjon

    i love this arduino, its perfect for my electronics projects! it came superbly packaged as usual and a fast delivery time. i strongly recommend ordering from proto-pic they have never let me down.

  22. Jago Lee

    Came well packaged and in working order!

  23. Dave Boult

    Arrived the very next day and what a cracking product. I’m new to both Arduino and electronics so I’ll no doubt be back for more bits and pieces (in fact, I already have been…)Excellent service, a great range and great prices too.

  24. John

    I bought this and the Adafruit motor shield. Both arrived within a couple of days and have been working ever since. Great price & service.

  25. Arduino fo

    This is a great little board that can be programed using the free Visual Studio plugin called Visual Micro. Visual Studio allows us to easily understand code, drill down into compiler errors and much more.

  26. Ewan

    Thanks very much!

  27. Noah Schil

    As well as David Stone, I bought one of these elsewhere and it was faulty. I ordered one from here and it came directly the next day! For an amazing price. Amazing! I wouldn’t buy ANY Arduino from anywhere else in the UK compared to here. Great shop

  28. David Ston

    I bought one of these elsewhere and it was faulty, the seller didnt want to know. The guys at Proto-PIC sorted the problem out for me, ive since bought another 3 from them! Its a great piece of kit at a great price.

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