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Speed measurement using Inductive Proximity Sensor in LINX

Hello All,

 

I'm trying to measure RPM of DC Motor using Inductive Proximity Sensor in Labview LINX through Arduino Digital Pin. I tried to read output of proximity sensor using attached vi but how to find frequency of these pulses to detect RPM of motor. Any help will be appreciated.

 

Im attaching the image of pulses captured from proximity sensor

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Any help on above question..

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