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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
Yep - the only gotcha is that some phones seem to have the audio wired backwards, but it's not a big deal. Just do it once one way, and again the other... Or if you're doing two-way comms you can just check and see which option works.