• If you establish some pattern beforehand, you can pick by algorithm or random and push out as @Gordon sugget. When you want to move things around within chosen pattern or splice things together, you can use algorithms written in C, as I did in Efficiently moving things around in zig-zag Graphics buffer visualized w/ 24/32 bpp displays / neopixel strings. The referenced example uses the graphics buffer that is suppoted with graphics functions. The graphics functions are used to write to the buffer, and an intervalled process writes it out to the LED string(s). The arrangement of your LEDs are like the surface of a cylinder which is just lime a bent dot matrix screen on which you can draw things on.


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