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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
If you want to make something small, you could look at using a bare MDBT42Q module and a custom PCB.
Using LEDs would be interesting, but a bit of a nightmare! What about an OLED? compared to that many LEDs the ribbon cable would be trivial to solder!