Calibrating the anemometer

The best anemometer calibration setup I could come up with.

The anemometer calibration device.

I went about calibrating the anemometer with an arduino counting interrupts from the anemometer reed switch with a simple hardware debounce I found. It first starts counting the anemometer pulses when the middle pushbutton is pressed. Then, after it has received 10 samples, it calculates the average time between them. Finally it displays the average pulse delay and calculated RPM on the lcd screen. I drove around doing my best to go in intervals of 5mph up to about 40 on a straight bit of local road and sampled each speed multiple times. When I had a fair bit of samples from each speed I averaged them and got the approximation of the anemometer for each speed. It turns out it is fairly linear from my extremely rough calibration data. On average it spins 10.268 revolutions per mile of wind speed.

My calibration data:
AnemometerCalibration.ods
The code for the calibration device
Wind_Speed_calibrator.ino

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