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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
No, it's great - keep posting up :)
Honestly I'm not quite sure when the Picos will be available at the moment. Hopefully right at the beginning of May though.
Using serial, I'd recommend that you use a MAX232 or similar, you just need a few caps and it'll convert the signal to standard 12v RS232 levels - which, like DMX, should do 30 metres easily.
5v might be fine, but I think it's actually the potential for picking up interference that would be a problem, rather than the propagation of the actual signal.