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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 - you can get an F401, or a F407 I think? The F407 was the first one so on all the literature they just refer to it as F4 :(
@pablorodiz I'm not specifically trying to get you to buy a Pico, but if you could have waited for it to arrive it would have saved you a lot time working your way through Espruino source code and Makefiles :)