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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.
@Gordon
@DrAzzy - this probably explains it better than I could: https://github.com/espruino/EspruinoOrion/blob/gh-pages/serial_to_audio.js
There's another one (just posted the video above) where I can do 2-way. The code for that is similar, but a bit more complex (and requires permission to use the mic).