Adafruit 100226 24 RGB Neopixel LED Ring with Integrated Drivers

Adafruit Neopixel Ring with Integrated Drivers comes as a single ring with individually addressable RGB LEDs assembled and tested. Ultra bright smart LED NeoPixels are arranged in a circle. Round and round and round they go. The rings are chainable - connect the output pin of one to the input pin of another. Use only one microcontroller pin to control as many as you can chain together. Each LED is addressable as the driver chip is inside the LED. Each one has ~18mA constant current drive so the colour will be very consistent even if the voltage varies and no external choke resistors are required making the design slim. Power the whole thing with 5VDC and youre ready to rock. There is a single data line with a very timing-specific protocol. Since the protocol is very sensitive to timing it requires a real-time microcontroller such as an AVR Arduino PIC mbed etc. It cannot be used with a Linux-based microcomputer or interpreted microcontroller such as the netduino or Basic Stamp. This wonderfully-written Neopixel library for Arduino supports these pixels. As it requires hand-tuned assembly it is only for AVR cores but others may have ported this chip driver code so please google around. An 8MHz or faster processor is required. Comes as a single ring with individually addressable RGB LEDs assembled and tested.