Arduino Uno
The web site for all Arduino products is at: 
http://www.arduino.cc/
The web page for the Arduino Uno is at: http://arduino.cc/en/Main/ArduinoBoardUno
Arduino Uno Development board
The Arduino Uno (REV3) development board can be purchased from these vendors (prices valid as 05/01/14):
| vendor | part # | price | web site |
|---|---|---|---|
| Radio Shack | 276-128 | $29.99 | http://www.radioshack.com/product/index.jsp?productId=12268262 |
| Spark Fun Electronics | DEV-11021 | $24.95 | http://www.sparkfun.com/products/11021 |
| Digi-Key | 1050-1024-ND | $28.57 | http://search.digikey.com/us/en/products/A000066/1050-1024-ND/2784006 |
| Digi-Key (SMD edition) | 1050-1041-ND | $26.89 | http://www.digikey.com/product-detail/en/A000073/1050-1041-ND/3476357 |
| Adafruit | 50 | $24.95 | http://www.adafruit.com/products/50 |
Arduino Uno controller
The controller itself is a 28 pin .3 inch wide DIP package and be purchased from these vendors:
| vendor | part # | price | web site |
|---|---|---|---|
| Spark Fun Electronics | DEV-10524 | $5.50 | http://www.sparkfun.com/products/10524 |
| Digi-key | 1050-1019-ND | $5.12 | http://www.digikey.com/product-detail/en/A000048/1050-1019-ND/2639007 |
Shield information
| description | vendor | part # | price | web site |
|---|---|---|---|---|
| Arduino A000077 Proto Shield | Radio Shack | 276-140 | $16.99 | proto-shield |
| Arduino A000077 Proto Shield | Digi-Key | 1050-1035-ND | $15.97 | proto-shield |
| Arduino SD Shield | Radio Shack | 276-132 | $29.99 | sd-shield |
| microSD Shield | Spark Fun | DEV-09802 | $14.95 | microSD |
| microSD Shield Retail | Spark Fun | RTL-09899 | $16.95 | microSD-R |
Arduino Uno Connection template
This template has two tables to it, you will need both when you document your project. The Arduino Uno needs to be oriented such that the power jack (will be on the left) and the USB connector (will be on the right) are pointing to the top as shown in the photo below.
Arduino Uno - Right side connections
Note: For the Arduino Uno R3, the label for the SCL and SDA connections are located on the bottom of the board.
| function name | connect to | comments |
|---|---|---|
| SCL | ||
| SDA | ||
| AREF | ||
| GND | ||
| 13 | ||
| 12 | ||
| ~11 | ||
| ~10 | ||
| ~9 | ||
| 8 | ||
| 7 | ||
| ~6 | ||
| ~5 | ||
| 4 | ||
| ~3 | ||
| 2 | ||
| TX -> 1 | ||
| RX <- 0 |
Arduino Uno - Left side connections
| function name | connect to | comments |
|---|---|---|
| IOREF | ||
| RESET | ||
| 3.3V | ||
| 5V | ||
| GND | ||
| GND | ||
| Vin | ||
| A0 | ||
| A1 | ||
| A2 | ||
| A3 | ||
| A4 | ||
| A5 |
Additional information
Found the following items from Spark Fun Electronics that might aid in prototyping Arduino Uno related projects
| description | part # | price | URL |
|---|---|---|---|
| RedBoard - Breadboard Kit | RTL-11039 | $25.95 | https://www.sparkfun.com/products/11039 |