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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
Definitely - although it may not last for long :)
The STM32 is rated to 4v normally, so I guess it's not such a big stretch. Internally I think it runs at ~1.8v and has a voltage regulator, but I'd imagine at some point the GPIO or voltage regulator would start to have problems.
Strange about the low speed RC oscillator speeding up - it looks like it runs off 3.3v then ;) Probably explains why it's such a pain to get it to be accurate.