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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
STM32s still have about that voltage range (2-3.6v I think?) - just no DC/DC converter. However it seems that for very low current draws they turn the DC/DC off - it's only when it's executing that they turn it on.