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find the speed of the DC motor using proximity sensor

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selva murugesan

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Hello experts

In my project , I want control & display the speed of the Wiper Dc motor(12v,5v). For this I am using the PIC 16F877A and IRFP150n (MOSFET).
Now I control speed of the motor with help of PWM. I am using the proximity sensor to sense the speed.for my problem , how can get the speed with help of the proximity output signal. the speed range is 10-50rpm. what is best method to get the speed?
 

hi friend,

thanks for reply.

I understand the circuit.Not only in this circuit , generally ,more people are using 20Mhz(crystal) for control such like low speed control. May i know any specific reason for this?
 

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