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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
I'm pretty sure the new board will end up using an F4 part because I can get them in smaller packages. It should let me squash everything down into something the size of a small USB key.
Hopefully I can get the cost down enough that it'll solve this kind of problem - it'll be worth just building the board right in to whatever projects you're planning.