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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
If you don't touch the wires used from JS code then they should hopefully be tristate anyway.
... but as you say, if it was amazingly dry (or wet) then you'd expect a value out of range... But it's unlikely you'd be getting exactly 0 as a humidity reading.