How to convert digital signal to analog

Hi..
I am using NI 9375 (DIO module) to read the output from flow sensor.
The output of the flow sensor is in the digital signal.(Boolean=True/False).
How can I convert the digital signal to the analog to get the reading of the flow sensor?
I had tried before to convert the digital signal to the frequency so that I can make the conversion from frequency to the flowsensor reading,
but it doesn't work.( I am referring to http://www.ni.com/white-paper/14549/en/ ).

nhan91213 wrote:
Hi..
I am using NI 9375 (DIO module) to read the output from flow sensor.
The output of the flow sensor is in the digital signal.(Boolean=True/False).
How can I convert the digital signal to the analog to get the reading of the flow sensor?
I had tried before to convert the digital signal to the frequency so that I can make the conversion from frequency to the flowsensor reading,
but it doesn't work.( I am referring to http://www.ni.com/white-paper/14549/en/ ).
FYI - If your flowmeter pulsing frequency is higher than 500Hz then you won't get reliable reading using your algorithm, and it will be very unreliable above 1kHz because fastest that loop runs is 1mS (1kHz). In that case you could tie the timed loop to a higher rate (hardware) clock source to go faster than 1mSec loop time. If no hardware then I think you can use high resolution timer (in LV2014, not sure if it was also available in previous version) and a regular while loop with algorithm modification for a faster timing.
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shubham62 wrote:
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