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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
There's now a page on doing this here: http://www.espruino.com/Headphone
Especially if you only want to send data rather than receive as well, you only need two components. Which country are you in? There is probably some local electrical distributor you can get the parts from - and for the plug itself you can usually dismantle an old set of headphones