TODO: Link the following datasheets:
TODO: Explain smart leds and their protocol
TODO: Explain techniques for using SPI, I2S, PWM, etc. for controlling smart leds
I found this small (2.1mm x 2.1mm) LED that seems to use the same Smart LED protocol as the WS2812/SK6812/AP102 families. At the time, it was available in a small-ish quantity (600 stock or so) on JLCPCB parts list, which was enough for 5 of the original Calculator Keypad prototypes.
I haven't yet tested them to see if they require different control schemes or modifications from standard techniques.