Generally, a Hall Effect sensor will produce one pulse for every two magnets, since the sensor switches between high and low in the presence of both a north and a south pole magnet. A Magnetoresistive sensor will generate one square wave pulse per magnet. Special discs can be custom manufactured to meet specific needs. Steel targets can be substituted for magnets on aluminum or PVC discs. These targets work well with proximity or magnetic pick-up sensors.
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