Arduino Uno R3 compatible Microcontroller Card is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software.
It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.
It is an open-source physical computing platform based on a simple i/o board 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). Package Contents: Arduino Uno R3 Board Blue USB A to B Cable
Contains Everything Needed
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 Atmega8U2 programmed as a USB-to-serial converter.
"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.
Easy-to-use Arduino Platform
Arduino is an open-source electronics platform based on easy-to-use hardware and software. Arduino boards are able to read inputs - light on a sensor, a finger on a button, or a Twitter message - and turn it into an output - activating a motor, turning on an LED, publishing something online. You can tell your board what to do by sending a set of instructions to the microcontroller on the board.
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 of which 0.5 KB used by bootloader SRAM
2 KB EEPROM
1 KB Clock Speed
It has 14 digital input/output pins (of which 6 can be used as PWM outputs)
6 analog inputs, a 16 MHz crystal oscillator
USB connection, a power jack, an ICSP header