How to process the analog output of hall-effec​t sensors to determine gear RPM.

Hi,
I am using a hall effect sensor to determine the rpm of my shaft. Attached to my shaft is a spur gear, and the sensor detects when the gear teeth passes it.
The attached pdf shows the "idle" state when there is no ferrous target detected.  And when a ferrous target (my gear tooth) is detected, a horizontal like is displayed.
I am using the NI-9229 device connecting my hall effect sensor to my PC.
I would like to know how I can process this signal so as to determine the rpm of my shaft in real-time.
Thanks and appreciate the assistance.
Regards,
ST
Attachments:
Hall_effect_sensing.pdf ‏218 KB

Hi, check this one out:
https://decibel.ni.com/content/thread/13337
Br,
/Roger

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