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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
Thanks :)
Supporting that many different characters in Espruino would just take up too much space I'm afraid, but you could just display images for the characters you want? http://www.espruino.com/Graphics#images-bitmaps
There's an online image converter at http://www.espruino.com/Image+Converter that makes it a lot easier to pull in images, but that page itself is just a few lines of code using HTML Canvas - it'd be really easy to modify that so that it drew your emoji on the computer and created an image out of it.