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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
PWM should do push/pull just fine in normal mode? I have used it with a voltage multiplier in the past without problems.
However PWM freq/duty cycle won't directly affect the voltage out the end - so I guess you'll need a voltage divider and then some kind of feedback loop?