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Need Help to estimate time for counting edges of analog square wave

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Dear fellow labview users,

 

I am building a DC magnetic motor and I have integrated a hall effect sensor to count the frequency of the motor. 

Due to the limited number of 'counter' channel in my USB 6211, I decided to use an analog input channel to retrieve the

signal from the hall effect sensor. 

Thus far, I have managed to count the edges (falling) of the analog square wave. I intended to estimate time needed to complete

one square wave cycle and calculate the frequency. I know such approach may not be as accurate as the 'counting edge/frequency' using

the counter channel but this is necessary as I wanted to use the analog input channel for the measurement. 

 

I need some advice/help to get the time and complete the routine for calculating the frequency of the motor. 

I have attached some info for references. 

Thanks a lot guys..

 

Alam


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