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Arduino Uno R3, ATmega328 USB Board, SMD Version US$28.57

A000073
Arduino Uno R3, ATmega328 USB Board, SMD Version


The Arduino Uno USB board is based on an AVR ATmega328 microcontroller running at 5V/16MHz. The ATmega is pre-programmed with the Arduino bootloader that allows you to upload code to the ATmega328 via USB using the open-source Arduino development environment. The Uno R3 uses an ATmega16U2 chip for USB connectivity. This allows for faster transfer rates compared to using a USB-to-serial converter chip, and requires no drivers to be installed for Linux or Mac (for Windows a .inf file is included with the Arduino IDE software).

The Arduino Uno USB board has 14 digital input/output pins (6 can be used as PWM outputs) and 6 analog inputs available via female headers. The female sockets accept standard square pin headers.

This ATmega board also features a power jack (7V to 12V DC), a 23-pin AVR In-System Programming (ISP) header, and a reset button. It contains everything needed to support the ATmega microcontroller; simply connect it to a computer with a USB cable or power it with an optional AC-to-DC adapter or battery to get started.

This board is R3, making it compatible with newer Arduino shields that use additional pins. Arduino R3 adds SDA and SCL pins near the AREF pin, and two other new pins placed near the RESET pin. One is called IOREF, which allows R3 shields to adapt to the voltage provided from the board. The other new pin is not connected; it is reserved for future purposes. Arduino R3 boards are still compatible with legacy Arduino shields.

This version of the board has a surface-mount ATmega328 microcontroller. It is identical to the DIP version functionally. The only practical difference is that this SMD version has a TQFP chip soldered to the board while the DIP version has its chip in a socket so it can be replaced if necessary.

Installing drivers for the Arduino Uno under Windows 7, Vista, or XP

  • Plug in your board and wait for Windows to begin its driver installation process. After a few moments, the process will fail.
  • Click on the Start Menu, and open up Control Panel.
  • While in the Control Panel, navigate to System and Security.
  • Next, click on System. Once the System window is up, open the Device Manager.
  • Look under Ports (COM & LPT). You should see an open port named "Arduino UNO (COMxx)"
  • Right-click on the "Arduino UNO (COMxx)" port and choose the "Update Driver Software" option.
  • Next, choose the "Browse my computer for Driver software" option.
  • Finally, navigate to and select the Uno's driver file, named "ArduinoUNO.inf", located in the "Drivers" folder within the directory into which you installed the Arduino Development Environment software.
  • Windows will finish the driver installation from there.
Be sure to use the Arduino 1.0 IDE or later to ensure proper driver installation for the Uno R3.

About Arduino

Arduino is an open-source platform based on boards featuring an Atmel AVR microcontroller with a pre-programmed bootloader and a development environment that implements the Processing / Wiring language. Arduino can be used to develop stand-alone interactive objects or can be connected to software on your computer (e.g. Flash, Processing, MaxMSP). The open-source IDE can be downloaded for free (currently for Mac OS X, Windows, and Linux).

Arduino References

Expanded Functionality with Arduino Shields

The Arduino's I/O port pins are not just for wiring to a breadboard. Ready-to-use add-on peripheral boards called Arduino Shields can plug into them. In some cases, multiple shields can be stacked on top of one another. The options below list just a few popular shields. Check out that category for the full list.

Note: If you choose the GSM/GPRS Module for Arduino add-on board below, you also will need a compatible antenna which is not included.


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Power Supply 3-12V DC, U.S. plug, 6 connection tips+ US$11.00
Power Supply 3-12V DC, US/UK/Euro/AU Plugs, 100-240VAC+ US$13.00
Rectangular Pin Header, Male, 1x40 Single Row, 2.54mm Spacing+ US$0.75
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Atmel AVR ISP Adapter, 10-pin to 6-pin (Atmel Butterfly)+ US$7.50
Arduino Stackable Female Header Kit, for R3 & newer+ US$1.50
Arduino Stackable Female Header - 6 Pin+ US$0.50
Arduino Stackable Female Header - 8 Pin+ US$0.50
Arduino Stackable Female Header - 10 Pin+ US$0.50
2x mikroBUS Interface for Arduino (Arduino UNO click shield)+ US$7.50

This product was added to our catalog on Tuesday 07 August, 2012.

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