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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
Hi - the cheap board would end up looking a bit like the STM32F4 stamp - but I'm holding off on that for now because it looks like there'll soon be a much better chip available for it (crystal-less, so I can get the cost down more).
The WiFi one (see a few pages back for some pictures) will have micro USB on it - but yes, I'll keep selling the original and the Pico boards. I think they each fill their own niche.