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How do you program LabView to count voltage increases
tmoran1
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04-20-2005 02:55 PM
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I am having serious trouble figuring out how to use your program. All I want to do is have the program count the number of times the input voltage goes above a certain threshhold. Thank you for the help
Mcdan
NI Employee (retired)
04-20-2005 04:13 PM
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tmoran1,
I don't know how you are acquiring your data, however I wrote a quick example that should give you some idea of how you can do this. Basically you will replace the slider with the input voltage you are interested in. One thing to keep in mind is that most real signals acquired are a little bit noisy. Because of this, if your signal is very close to the threshold, it may appear to cross it many times. If you have more specific questions let me know. Hopefully the attached VI can get you on your way.
Hope this helps,
Dan
I don't know how you are acquiring your data, however I wrote a quick example that should give you some idea of how you can do this. Basically you will replace the slider with the input voltage you are interested in. One thing to keep in mind is that most real signals acquired are a little bit noisy. Because of this, if your signal is very close to the threshold, it may appear to cross it many times. If you have more specific questions let me know. Hopefully the attached VI can get you on your way.
Hope this helps,
Dan
04-20-2005 04:59 PM
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Thank you for the help, but the file that you sent was version 7.1.1 I have version 7.0 Could you please re-send the file in the 7.0 format. Thanks
Mcdan
NI Employee (retired)
04-20-2005 05:03 PM
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Sorry about that... Try this version.
Dan
Dan
04-21-2005 03:48 PM
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My input is a voltage source from a DAQPad 6015. The program keeps telling me I can't replace the virtual signal with my signal from the DAQ Pad. What do I do?
Mcdan
NI Employee (retired)
04-21-2005 04:44 PM
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tmoran1,
I am not sure what error you are seeing, and will have trouble diagnosing it without seeing your VI. However, I have extended my example such that it should be compatible with your DAQPad for your input voltage source. It uses software timed reads to acquire a voltage, then checks it against the limit. This is a fairly simple method which should get you started. The rate at which this type of read will execute is dependent on your system, and your system's load. If it does not acquire data fast enough (ie.. you are missing transitions above your threshold) then you may want to consider using a hardware timed approach.
Hope this helps,
Dan
I am not sure what error you are seeing, and will have trouble diagnosing it without seeing your VI. However, I have extended my example such that it should be compatible with your DAQPad for your input voltage source. It uses software timed reads to acquire a voltage, then checks it against the limit. This is a fairly simple method which should get you started. The rate at which this type of read will execute is dependent on your system, and your system's load. If it does not acquire data fast enough (ie.. you are missing transitions above your threshold) then you may want to consider using a hardware timed approach.
Hope this helps,
Dan
