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Beware that Hall Sensor amplitudes can drift

If the mean or gain drifts….

Too large a hysteresis gap might  cause a false negative (missed events)

Too small a hysteresis gap might cause a false positive ( invalid event counts)

There are algorithms or filters that involve previous cycle time and rate change, (PID corrections)  but the proportional threshold I had plotted  is ideal for random drift and CMOS Schmitt Triggers are close to that at 1/3 hysteresis of the valid range which also have some random drift and thermal drift.