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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
Ahh, ok. I'm afraid that's not easy at all.
Basically as I said before, you'd have to put a chip like the STM32F103RCT on a custom-made PCB and program it with the Serial Bootloader. Basically it'll cost you more money and will be significantly harder than just buying another Espruino board.
There are of course other boards that run Espruino, but they might require a few changes (in terms of pin assignments) to work. They're not a massive amount cheaper though, you're not supporting Espruino, and a lot of them don't have such a wide voltage input range and tend to draw more power :)
Otherwise I'm actually working on a smaller and cheaper Espruino board, but it'll be a few months before that gets finished.