Assembled - Breadboard Friendly NulSom Rainbow Chip for Arduino / uC - Pack of 4 WS2812B (WS2811) Addressable RGB LED

This is the easiest way possible to add tiny and ultra bright RGB LED to your project.
Each pixel of the three primary color can archive 256 brightness display, completed 16,777,216 color display.
Power the whole thing with 5VDC ( 3.5V ~ 5.5V works)
The LEDs are chainable by connecting the output of one chip into the input of another.
This pixel has full 24-bit color ability by the built-in controller chip. Since the LED is so bright and compact, you need less current/power/space to get the effects you want.

Libraries:
for Arduino - http://nulsom.com/source/NS_Rainbow.zip
for ATmega328 - http://www.nulsom.com/source/NS_Rainbow_for_ATmega328P.zip
for ATmega128 - http://www.nulsom.com/source/NS_Rainbow_for_ATmega128.zip
for ATmega8 - http://www.nulsom.com/source/NS_Rainbow_for_ATmega8A.zip