STM32 WS2812B
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When developing the STM32Dev board a WS2812B RGB LED was including connected to the PC6 GPIO.
The WS2812B LED contains 3 LEDS: red, green and blue and each of these LEDS can be set at 256 different brightness levels. These levels are controlled with a bit stream running at 800 kHz and multiple LEDS (up to 1000-ish) can be chained after each other.
Library on Github
The library is available on Github: