Adafruit Pixel Shifter - For Addressable LEDs

We've been stocking WS2811-n-friends for a long time, enough to see many iterations and versions of the "one-wire-control" addressable LED pixel. We call them NeoPixels, since the part number itself can change quite a bit, but all have the same idea: send color data to lights and they'll change on their own without having to constantly PWM three or four diodes. Despite this simplicity, we've seen folks struggle with them because of voltage level expectations: some NeoPixel-compatible pixels are very picky and want 5V logic level. Without the right voltage, you get flickering or weird behavior. There's also some funky variants like the TM1814 that want inverted signal levels.