I used an Arduino mini Pro (3.3V – 8MHz) from sparkfun and interfaced with Adafruit’s Neopixel Ring LEDs. A lithium ion battery (3.7V) was used for power supply. Everything was placed inside the cap.
Featured Adafruit Product!
NeoPixel Ring – 24 x 5050 RGB LED with Integrated Drivers: 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!
(read more and see our full selection of NeoPixel Rings)
Each Monday is ArduinoMonday here at Adafruit! Be sure to check out our posts, tutorials and new Arduino related products. Adafruit manufactures the Arduino right here in the United States in cooperation with arduino.cc. We have a huge selection of Arduino accessories and all the code and tutorials to get you up and running in no time!