Tiled Neomatrix on different pins - only first defined works

[johnwasser]

@gfvalvo

Try using the numPixels() function to see if the NeoPixel memory for the second matrix is actually allocated. From Adafruit_NeoPixel.h:

Good call, @gfvalvo.

When compiled for Arduino UNO this sketch has enough RAM for 440 pixels (10x11x4) but not 484 (11x11x4). For 1024 pixels (16x16x4) you are going to need an Arduino with more RAM.