LED

A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, and are increasingly used for lighting. Introduced as a practical electronic component in 1962, early LEDs emitted low-intensity red light, but modern versions are available across the visible spectrum|visible, ultraviolet and infrared wavelengths, with very high brightness.

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Packet solutions

Rainbowduino

Rainbowduino is a packet Arduino compatible solution for driving RGB LED's

• Rainbowduino http://www.seeedstudio.com/depot/rainbowduino-led-driver-platform-atmega-328-p-371.html?cPath=93_99

ShiftBrite

ShiftBrite is a packet modular RGB LED. There's an arduino library to easy program it.

• ShiftBrite http://macetech.com/blog/node/54
• ShiftBrite Shop http://macetech.com/store/index.php?main_page=product_info&cPath=1&products_id=1
• Library http://www.arduino.cc/playground/Main/ShiftBriteLib

BlinkM

BlinkM is an RGB led packet together with an small microcontroller so you can control a huge number of RGB LED's over a single data bus. An Arduino could be use to communicate with the bus and control all the LED's

• BlinkM http://thingm.com/products/blinkm

DMX

Allow your Arduino to talk DMX so you can manage stage professional LED lighting equipment.

• Arduino and DMX http://www.arduino.cc/playground/Learning/DMX
• DMX Shield http://www.arduino.cc/playground/DMX/DMXShield
• Diagram on using the MAX485 chip http://fritzing.org/projects/arduino-to-dmx-converter/

Helpful links for programming RGB LED's

• RGB to Hex Conversion [1]