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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
The reason I haven't updated it is I'm a little unsure about how well (reliably) the voltage regulator functions when the input voltage is below (or even close to) the voltage it wants to produce - I ought to check that.
It's a bit more uncertain because I changed the regulator for one that draws much less power in the 1v4 revision (which will start showing up soon).
But yes... If you try it, the chip does function down to very low voltages :)