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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 do this, shoving an MDBT42, RN2483, and a 3.3v power supply on a board would only take a few minutes. There's very little circuitry required.
A lot of what's on there seems to be for (I guess) an Arduino-compatible processor - but all that would be built into the MDBT42.