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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
Reading the FT330 should be no problem.
It outputs flow as a frequency, which is inconvenient, but just do setWatch() on the pin to get the times of the pulses, and then do a bit of math to convert that to a flow rate. Make the code the runs in the watch short n' fast. Only problem I could see is if it it bogs down the Espruino at high flow rates (I doubut it will, and if it's a problem now, it probably won't be once we get a few more improvements to compiled js so you can use that).