HOW TO MEASURE THE WIDTH/TIME GAP PULSE ANALOG OF A WAVE

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• How to measure the width of pulse with MyRIO

  Hello

  Sorry in advance if this is not the most appropriate forum.  I'm not entirely sure if it's a more general problem of 'software' or the MyRIO-specific.  I have searched the forums and found a few related topics but could find no one who help me in this context.

  I'm trying to measure the width of a sensor pulse ultrasonic ping.  It emits a signal conditioning - the time that it is high directly corelates how far is the object.  Being new to LabVIEW I am confused as to how do I calculate the time it remains high.

  I read that LabVIEW should not need to 'variables' as in python or C, for what is the best way to measure time, the signal is high?  Normally, I'd go (new_time - old_time), but obviously I can't store an old time in LabVIEW as I would in python or C.

  Other notes:

  I have the sensor correctly ping echoing and I can see the blips on a chart and see a perfectly square wave valid.

  

  To answer your question on how you would in LabVIEW...

  While LabVIEW has not stated/named variables that you have in a language based on text, the data is stored on the wires. You can use the nodes as node registers or shift of feedback to store values between iterations of a loop:

  (this will keep subtracting y (starting with 0) and store the result for the next time it runs)

  LabVIEW also has functions in the range of mathematics/signal processing to make the detection of pulse on a waveform.

• How to measure the execution time of a specific to a VI process?

  Hello! My VI has two processes: compression and edge detection image and I'm trying to measure the execution time for the process of detection of edge of my VI, but I don't know how to do. Please give me some ideas on how to do it. Thank you!

  There are several ways that you can do.

  -L' one is using the number of cycles before and after your vi to get time like here: http://digital.ni.com/public.nsf/allkb/6F6B9F4E149C80578625652800784764

  - or use the profiling: https://zone.ni.com/reference/en-XX/help/371361H-01/lvhowto/profiling_vis/

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  -You have not to load the image inside the loop instead, make him outside of the loop.

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• Change the width of digital pulse inside the loop

  Hello

  I am looking for a solution that allow you to change the width of digital pulse inside while loop.

  Thanks in advance

  

  Check the operation of dataflow and single pulse meter output

  First counter generates little time, then big time.

  Your AO task then is to adjust tension on IT after Dig pulse. After the AO pulse width, he needs to put down

  If the Trac software is small enough for you, you might have used USB-6008 ($250), not Xseries $ 1600 - apparently of an overdose. X series can do this work with a void microsecond resolution.

  

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  Hello

  See this http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=5564&messageID=19417

  Maybe the help!

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  Hi 40123157,

  You use the module in an appropriate manner, and there is no simple way to improve the time of loop iteration beyond what you've done. Here are my suggestions:

  (1) the i2c commands take a long time. In your application, it may speed up if you run only move the engine only when the engine speed has changed.

  (2) for this particular example, you do not use the release of the report engine. If this VI does not need to run it can be removed.

  (3) If you need to speed up execution other than that, as a user advanced LabVIEW, you can create a copy of the VI of engines to move and change it as you choose. All you have to to the "DC motors' entry is use cluster to array on the cluster, as shown below. I think you can speed it up by running all the settings before the loop (type sensor and fixed connection configuration), and removing the value of power if you send only the values between-100 and 100.

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• How to calculate the execution time of a SCTL in FPGA VI?

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  A SCTL will always run in a beat the clock it has been linked to.  So, if you use a 40 MHz clock, this loop will run in 25 ns.  If the code cannot complete in that, or if it requires two graduations of the watch to do the calculation, your code does not compile, then you have the guarantee that this will always be how long it takes this piece of code to run.

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  I hope I have your question! See attached screenshot

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  How to display ONLY the hour (15)?

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  Hello

  Use the formatDateTime Qt method:

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  * arrg * navigation bar does not work with the current version of the plugin.

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  hope this helps you.

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