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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.
@allObjects
...LGTM... But how is your wiring? If you do
require("neopixel").write(B15, [255,0,0]);, what happens? ...should go dark, should it? Did you try another pin but B15?