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unsolicited thought:
by counting pulses, the sensor is inaccurate at slow speeds. Perhaps even a little off over the whole range.
If the timing changes of the pulses are considered, perhaps one could calibrate it and get more useable range and more accuracy from the sensor by using the pulse timing to look up calibrated values.
Or the sensor just stops turning at that slow of a speed.
After that the next gain in accuracy would be had trying to consider the acceleration of the rotor.
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