I thought there would be a zillion others who have wanted to do this. Must be using the wrong search terms.
I have a set of wind cups, not sure where they came from, but the motor (3.7vdc) spindle from a cheap quadcopter or helicopter (can't recall) fits nicely and gives varying output voltages when I spin it with a hair dryer.
Not sure how long the bearings will last but I have 6 of the motors, so no big deal. Anyway, I am looking for some Arduino code to convert the voltage to a usable signal to indicate wind speed.
Spinning the motor with a variable-speed electric drill gives seemingly linear results up to 47mVdc which is as fast the drill runs, probably around 500-700-rpm.
Do I need any electronics to feed the DC output into an Arduino?
Can anyone point me at some code to will then do that. I have a hand-held anemometer that I can roughly calibrate against when ti si working with the Nano.