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Arduino Uno - R3

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  • Arduino A000066 | Arduino Uno - R3 - Image 1 | Proto-PIC.co.uk
  • Arduino A000066 | Arduino Uno - R3 - Image 2 | Proto-PIC.co.uk
£18.65 (inc VAT) £15.54 (exc VAT)
SKU:
PPA000066
Weight:
41.0 Grams
Availability:

167 In Stock For Immediate Despatch Further Quantities Ordered On Demand which are usually despatched within 3-5 working days

 Product Reviews

Showing reviews 1-10 of 20 | Next

  1. Great product for a low price

    Posted by on

    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.


  2. A new version, same great product.

    Posted by on

    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.


  3. Better than ever

    Posted by on

    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.
    The only downside is the slightly low-featured Arduino IDE.


  4. Arduino for Beginners

    Posted by on

    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. The order arrived a few days before i excpected.

    The Arduino is a brilliant piece of kit. Sadly i did something to screw the bootloader, this is apparently easy to fix according to my Arduino friend.


  5. Great Product, Great Service

    Posted by on

    Packaging superb, service superb.


  6. Arduino Uno - R3

    Posted by on

    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.


  7. Better than the Pi

    Posted by on

    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.


  8. Excellent microcontroller

    Posted by on

    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, so programming isn't too hard to learn!


  9. Absolutely great fun

    Posted by on

    I bought the Arduino to use in conjuction with a shield that I bought from BackyardBrains.com. 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. Check my blog to see it working: http://jannetta.com/wordpress/stepper-motors-and-nerves/


  10. Very nice bit of kit

    Posted by on

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


Showing reviews 1-10 of 20 | Next

 Product Description

If you are looking to get started with arduino why not try our Arduino starter kit?

Please note: This listing is for the new REV 3 UNO,

The Arduino Uno 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 Atmega16U2 (Atmega8U2 up to version R2) programmed 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 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. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Arduino Due that operate 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.

"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 Arduino, moving forward. The Uno is the latest in a series of USB Arduino boards, and the reference model for the Arduino platform; for a comparison with previous versions, see the index of Arduino boards.

 Summary

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

 

Schematic & Reference Design

EAGLE files: 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. It communicates using the original STK500 protocol (reference, C header files).

 

You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header; see these instructions for details.

 

The ATmega16U2 (or 8U2 in the rev1 and rev2 boards) firmware source code is available . The ATmega16U2/8U2 is loaded with a DFU bootloader, which can be activated by:

  • On Rev1 boards: connecting the solder jumper on the back of the board (near the map of Italy) and then resetting the 8U2.
  • On Rev2 or later boards: there is a resistor that pulling the 8U2/16U2 HWB line to ground, making it easier to put into DFU mode.

You can then use Atmel's FLIP software (Windows) or the DFU programmer (Mac OS X and Linux) to load a new firmware. Or you can use the ISP header with an external programmer (overwriting the DFU bootloader). See this user-contributed tutorial for more information.

 

Automatic (Software) Reset

Rather than requiring a physical press of the reset button before an upload, the Arduino Uno is designed in a way that allows it to be reset by software running on a connected computer. One of the hardware flow control lines (DTR) of the ATmega8U2/16U2 is connected to the reset line of the ATmega328 via a 100 nanofarad capacitor. When this line is asserted (taken low), the reset line drops long enough to reset the chip. The Arduino software uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment. This means that the bootloader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload.

 

This setup has other implications. When the Uno is connected to either a computer running Mac OS X or Linux, it resets each time a connection is made to it from software (via USB). For the following half-second or so, the bootloader is running on the Uno. While it is programmed to ignore malformed data (i.e. anything besides an upload of new code), it will intercept the first few bytes of data sent to the board after a connection is opened. If a sketch running on the board receives one-time configuration or other data when it first starts, make sure that the software with which it communicates waits a second after opening the connection and before sending this data.

 

The Uno contains a trace that can be cut to disable the auto-reset. The pads on either side of the trace can be soldered together to re-enable it. It's labeled "RESET-EN". You may also be able to disable the auto-reset by connecting a 110 ohm resistor from 5V to the reset line; see this forum thread for details.

 

USB Overcurrent Protection

The Arduino Uno has a resettable polyfuse that protects your computer's USB ports from shorts and overcurrent. Although most computers provide their own internal protection, the fuse provides an extra layer of protection. If more than 500 mA is applied to the USB port, the fuse will automatically break the connection until the short or overload is removed.

 

Physical Characteristics

The maximum length and width of the Uno PCB are 2.7 and 2.1 inches respectively, with the USB connector and power jack extending beyond the former dimension. 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.




 Other Details

Brand and Part Number:
Arduino A000066 Arduino Uno - R3
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