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.

Tags: NI Software

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