Quote:
Originally Posted by Michael Hill
Like I said, I'm not counting the blades, I want to know how close the blades are to the casing. (i.e. the sensor) ...
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Yes, I know. The Allegro sensors do output an analog voltage proportional to the magnetic field ... so the closer the blade, the higher the reading. The sensor has to react fast enough to detect each and every blade as it passes - you need it to react even faster to detect the nearest point of the blade.
I think the problem with magnetic sensors here though is the material - surely it has it's own magnetic properties, which might vary from blade to blade? I think optical is better.