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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@DrAzzy
OH! I missed the part about powering only VCC off the +3.3 - I thought you had connected both the VCC and VDD to +3.3. That all makes sense then - and the separate powersupply obviates the need for the bypass cap.
That actually gives the WS2812 a benefit over WS2812B, since you can run a separate VCC line for the WS2812 and skip the individual caps, and just put one big one at the end of the string to keep VCC in general up...