More than 84 LEDs can not be controlled well.

[satakagi]

I actually connected 128 neoPixels and tested it, but I could not successfully control individual colors of LEDs exceeding the number of registers with burst write. So I am trying to fix this issue with following fork. It seems to be working well, but I am not used to programing AVR so I do not know if this is enough.

https://github.com/satakagi/neopixel_i2c

[usedbytes]

Thanks for pointing out this issue, and sorry for having not responded to this. I guess I lost track of it as it was in the middle of Christmas holidays.

Your solution is certainly a good workaround, I'll have a think about ways to provide individual addressing for high-number LEDs