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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.
@ClearMemory041063
The anemometers use regular magnets and a coil about the diameter of a nickel wound with #30 wire. Output about 1 Volt p-p max. I've used the LM339 inputs connected to a transformer to get 60 Hz square waves. Just keep the peak Voltage within the LM339 specs.
Hall Effect switches are nice too, but the anemometer has a coil.