Need some suggestion for Demantra Shape modeling

Hi All
Can any one sugesst me how to create a Demantra Shape modeling using 7.2 version. I am working on a POC which includes shape modeling.
Thanks
Ram

Kim,
Tttt yyyy pppp iii nnn gggg slowly.
You described your situation quite clearly.
As you probably know the digital inputs on the USB-6008/9 are software timed, so you have some uncertainty in the time of any sample.  Depending on your OS that uncertainty will typically be on the order of a few milliseconds but occasionally may be much longer.
To count the pulses in software requires a combination of several things.
1. You need to have a data acquisition method which is fast enough to capture each high and low state of the pulses produced by the pump.  For software timed Digital Input a good way to do this is to have an independent, parallel loop which reads the input line rapidly and passes the data or transitions to another loop via a queue.  This is known as the Producer loop in a Producer/Consumer architecture.  Examples come with labVIEW. A 10 ms Wait in the loop is probably appropriate.
2. You need to convert the digital inputs (levels) into pulses or transitions to be counted.  Suppose you want to increase the count by one every time the logical level changes from False to True. To do this you need to know the previous level and the current level. A shift register is one of the best ways to do this in LV.  Add a shift register to the loop.  Initialize it to False. Connect the result of the Digital Read to the right terminal of the shift regsiter inside the loop.  When that Read is True and the previous value (obtained from the left terminal of the shift register) is False, increment the count value (which is also kept in a shift register) in the case structure.
3. You did not indicate what you are doing with the counts or what the pulses represent.  Do you need to measure the frequency (or the period which is the reciprocal of the frequency)?  Do you need to accumulate the number of pulses? Over what time period?
Lynn

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    Tttt yyyy pppp iii nnn gggg slowly.
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