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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.
@MarkusGritsch
But the start and stopbits... don't they interfere with the desired bit stream? Also, the idle state for a NeoPixel data line is a low voltage, while the idle state for a serial line is a high voltage.
With major trickery it seems to be doable (see e.g. http://wp.josh.com/2014/09/03/inside-neouart-tricking-a-serial-port-into-being-a-signal-generator/), but it's probably not the way to go.