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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.
@KrumblySG
Are you attempting to use an Espruino as a Flow analyzer or Flow calculator?
Most liquid flow turbine meters that I have been familiar with use a magnetic pick up coil to generate an analogue pulse output to connect to a separate electronic flow analyzer. Flow meter comes with pre-calibrated internals with usually a 10 or 12 point calibration certificate (Calibrated with water or swept volume) and given a K factor number. This information is entered into the flow computer or analyser. These are either remote mount or directly mounted, bearing in mind shielded cables to drown out any interference or noise etc. I tried to find a datasheet on the pickup coils, and will keep looking. Some good info here:
https://www.c-a-m.com/products-and-services/measurement
and
http://www.fluidwell.com/