Adafruit neopixel shield for arduino 40 addressable rgb leds adafruit 1430 p the adafruit 40 neopixel shield lets your arduino address every single one of the 40 leds and set its 24 bit rgb value the result is a very 53 x 69mm 2 1 x 2 7in neat rectangle of bling these seemingly simple gadgets have triggered an amazing array of creative projects from watches and compasses to steampunk goggles and more the shield only uses 1 x digital ouput pin on the arduino and more neopixel shields