nailed is a one pixel camera on your nail.
it carries an IC with 16Kb of flash memory to save input from a color sensor and play it back on the RGB LED
prior at https://yair.cc/nld/
some info on the data pins and protocol of ws2812
he main difference between the two drivers is that the SK6812 has voltage-independent color and brightness over a wide voltage range, which means that the colors of the LEDs should not be affected by a drop in the supply voltage as much as they are on the WS2812B.source
32-Kbit I2C Serial EEPROM, pdf