How to match dynamic waveform to a sample waveform?

[yangyang-rexxar]

Hi

My proposal is to check the signal from some pins of a microchip, under different status the chip will output different waveforms, so I capture a sample waveform as a pattern, and then I want to continuously acquire waveform from microchip to match the pattern and them trigger LabVIEW event..

How to deal with this?

[parthabe]

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@paulbin wrote:

I want to continuously acquire waveform from microchip to match the pattern and them trigger LabVIEW event..

How to deal with this?

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You can use an Event Structure [ES] configured inside a while loop. Either in the ES' timeout event or in some other event configured for a Front Panel Boolean control [say, Acquire], you can put your acquisition code for getting the waveform continually.

Then you can have a Compare button under whose value change event you ll do the comparison of the sample & acquired waveforms. Here, you should trigger the other LabVIEW event you want using the Value(Signalling) event for that control.

Please explore the NI Example Finder thro' Help -->> Find Examples under the title "acquire"; you ll find a lot of examples.

[yangyang-rexxar]

Hi parthabe

Thanks, I'm aware of how to trigger event in ES, now I'm just seeking a waveform analysis arithmetic or a match pattern vi, I don't have a good thread on this.

[yangyang-rexxar]

See my captured patterns.

帖子被paulbin在10-10-2007 09:18 PM时编辑过了

[parthabe]

Use the Digital Comparison.vi i the Waveform -->> Digital Waveform pallette.

[yangyang-rexxar]

The graphs are acquired by AI, those are not regular digital signals, the waveform transition at 1.5V, 3V and so on. So I can't process these signals by digital VIs.

[菊花烧饼]

hi ,

  I have same problem in my test project, so i  am very  interested in your discuss.

 Pl keep up it : )