The NeoPixel Ring - 8 x WS2812 5050 RGB LED is a small ring of clever WS2812 LEDs that gives you control over which LEDS are active, individual color, and brightness. Using the RobotGeek Sensor Shield, you can quickly and easily hook up the NeoPixel Ring using a 3-pin sensor cable and start making something flashy!
The WS2812s are each addressable as the driver chip is located inside the LED. Each NeoPixel Stick has ~18mA constant current drive so the color will be very consistent even if the voltage varies, and requires 5V. Every ring is equipped with a single data line with a very timing-specific protocol requiring a real-time microconroller with a 8MHz or faster processor such as an AVR, Arduino, PIC, mbed, etc. There are solder pads on the back for connecting wires or breadboard pins and two mounting holes for securing this board to many different surfaces.