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Re: your question "also, what is this?" -- that's a fuse symbol, but it's not a true fuse.
See this post:
https://forum.pjrc.com/threads/28551-Teensy-fuse-values

I was just looking at macetech's RGBShades code that uses mapping (not sure if you based your code of that or not) and he defines NUM_LEDS as the matrix W x H. And then this same value is put in the...

Hi Jay. When looking at the code you posted you have:



So you've defined NUM_LEDS = 224
and then for the CRGB FastLeds array you're making that 16x17 = 272
and then in the addLeds line...