I've been playing with the Adafruit cup anemometer, which has a nominal output of 0.4 t 2 VDC. It looks good on an ordinary meter, but when I sample the output with my Uno or Zero, the numbers jump all over the place. The Arduino, of course, has a much faster response than the meter.
With stationary cups, I see an average of about 130 counts in the readings, but there'll be an occasional reading of 65, sometimes 150, etc.
Has anyone else checked one of these anemometers and found this kind of behavior?
Does someone know how the anemometer is producing its output? My next step is to take it apart, but I'd like to avoid that.