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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.
@DrAzzy
This controls a DC-DC converter, with max output voltage of around 30v at a few amps.
That fan is a 120VAC fan - so no, it can't be adjusted by powering it from an adjustable voltage DC power supply. I'm not sure how I'd adjust the speed of a line voltage fan. I've done it for a few 120vac fans with some old variacs I had sitting around, but that's not electronically controlled anyway. Of course, you could turn the fan on and off under electronic control easily enough.