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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.
Drarok
@Spocki
Connect the grounds of both puck and neopixel. You don't need an isolator between, neopixels normally run with an input signal of 3.3V. Isolators tend to make a sine wave out of a rectangular wave pattern ;-)