NulSom Rainbow Biscuit for ARM Cortex MCUs / Arduino / uC with Logic Level Converter - 3x3 Matrix WS2812B (WS2811, NeoPixel Compatible) Addressable RGB LED

Demo clips:
https://www.youtube.com/watch?v=6rHHc1o5uec

This is the easiest way possible to add small and ultra bright RGB LEDs 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 pixels are arranged in a ZigZag layout, i.e. pixel(row,column): DI-(1,1)-(1,2)-(1,3)-(2,1)-(2,2)-(2,3)-(3,1)-(3,2)-(3,3)-DO. The LEDs are chainable by connecting the output of one matrix into the input of another.
These pixels have 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