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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
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 ;-)