NeoPixel (WS2812) Bit Timing

The FSM Story

circuit4u
4 min readAug 27, 2022

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Inspired by Tim’s (blog link) FSM theory, I set out to measure a few different WS2812(B) neopixels in the draw.

In my previous post (link), I described a 555 timer circuit with its CV (control voltage) pin adjustable via a secondary voltage source. The output pulse of the 555 timer is fed into DIN pin of a neopixel. That makes a very simple test circuitry, no MCU, no programming.

By adjusting the voltage at the CV pin, you control the pulse width (duty cycle) of repeating pulse outputs. At the same time…

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circuit4u

memento of electronics and fun exploration for my future self