2 layers

Ws281x levelConverter
slapab/ws281x_driver
Simple driver (based on SPI, DMA, bit banding) for ws281x LEDs - implemented on stm32f103c8t6 written in C++11
29 parts
Printed circuit boards designed in KiCad and published on GitHub, each with its parts, layers and size, its README and its files; open any of them in PCBKit.

slapab/ws281x_driver
Simple driver (based on SPI, DMA, bit banding) for ws281x LEDs - implemented on stm32f103c8t6 written in C++11