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Here is a motor speed sensor module, the major goal is to check the rate of an electric motor. The module can be used in association with a microcontroller for motor speed detection, pulse count, ...

With the Speetec, Sick is expanding its product range for speed and length measurement of objects moving in a linear path to include technology that measures directly on the material surface. The ...

This is an incremental rotary encoder that uses contactless magnetic sensing to detect rotational speed and direction. The two Hall Effect sensors measure the 66-pole ring magnet and output two ...

A while back we featured a magnetic rotary encoder that [LongHairedHacker] designed. The heart of the system is an AS5043 magnetic rotary sensor which runs from $6.5-$11 and has a 10 bits precision.