What is better than intelligent RGB LEDs?  Smart RGB LEDs + white! These NeoPixel rings now have 4 LEDs (red, green, blue and white) for excellent lighting effects. They turn, turn, turn, turn, turn, turn, turn!  

This is the NeoPixel RGBW ring with 12 RGBW LEDs in natural white.

12 smart, ultra bright NeoPixels LEDs are arranged in a circle with an outside diameter of 1.45" (37mm). The rings are'chainable' - connect the output pin of one to the input pin of the other. Use only one microcontroller pin to control as many microcontrollers as you can link together! Each LED is addressable because the control chip is located inside the LED. Each of them has a constant current dimmer of ~18mA so that the color will be very constant even if the voltage varies, and no external choke resistance is required, making the design finer. Power it up with 5VDC and you're ready to have fun.

The NeoPixel is split, one half is the RGB you know and love, the other half is a white LED with yellow phosphorus. When turned off, it looks like an egg yolk. When turned on, they are incredibly bright and can be controlled with 8 PWM bits per channel (8 x 4 channels = 32 color bits in total). Ideal to add a lot of colored + white dots to your project!

NeoPixel LEDs use the 800 KHz protocol, so specific timing is required. On NeoPixels, the PWM frequency is about 400 Hz, which works well but is noticeable if the LED is moving. In comparison, DotStars have a PWM rate of 20 KHz, so even when moving the LED, you won't see the pixelation, the mixture is very smooth. (we recommend DotStars if you can use them)

NeoPixels are LEDs of size 5050 with a microcontroller integrated in the LED. You can adjust the brightness and color of each R/G/B/B/B/W/W with a PWM accuracy of 8 bits (i.e. 32 color bits per pixel). The LEDs are controlled by shift registers and only one digital output pin is required to send the data. The PWM is integrated into each LED chip so that once you have adjusted the color, you can stop talking to the ring and it will continue to PWM all the LEDs for you.

We have a tutorial showing wiring, power consumption calculations, sample usage codes, etc. for NeoPixel Please check! Please note that you will need a NeoPixel library with RGBW support that is not always available. If you try to control them with a simple NeoPixel'RGB' library, you will get very strange results. Our Adafruit NeoPixel library supports RGBW but if you use something else, be aware that it may require hacking.

Our detailed NeoPixel Uberguide contains everything you need to use NeoPixels in any shape and size. With ready-to-use library and example code for Arduino UNO/Duemilanove/Diecimila, Flora/Micro/Leonardo, Trinket/Gemma, Arduino Due & Arduino Mega/ADK (all versions)

Supplied as a single ring with 12 individually addressable, assembled and tested RGBW LEDs.

Technical details

    Outside diameter: 36.8mm / 1.45".
    Inner diameter: 23.3mm / 0.92".
    Thickness: 3.25 mm / 0.13 in.
    Weight: 3.3g
    Can be supplied with LEDs based on WS2812B or SK6812. They have the same brightness, color and protocol.

Documentation

Adafruit NeoPixel Überguide