We’ve just thrown the switch on a new Arduino library for creating LED matrix displays using NeoPixel LED strips, pixels or shields. All the functions in Adafruit_GFX are then available: lines, filled shapes, text, etc. The photo above shows three separate 10×8 matrices made from NeoPixel strip (240 pixels total — 4 meters of strip), tiled together into a single display…the library takes care of all the permutations! It’s also a great companion for our NeoPixel Shield.
We’ll have a tutorial soon. In the meantime, adventurous hacking types can get a head start looking through the example sketches. Download Adafruit_NeoMatrix from Github, then grab the latest Adafruit_NeoPixel and Adafruit_GFX while you’re there. Most mainstream Arduino boards can handle up to about 500 pixels, depending on the other RAM requirements of the sketch. The Arduino Mega 2560 is good for about 2,500 pixels…or if you really want to go nuts, these three libraries all now work on the Arduino Due and PJRC’s Teensy 3!