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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
When using naked WS2812Bs, you need the 0.1uf capacitor between ground and power right next to the LED. This capacitor (acting as a so-called filter capacitor) serves to prevent the brief voltage drop when the LED is turned on from resetting the controller inside the WS2812B.