Start/Pause/Resume Data Acquisition with DAQ assistant within a while loop

[Emanuele_S]

Hi everyone,

I'd like to create a VI in which I can start/pause/stop analog data acquisition and data display in a graph indicator with a DAQ assistant in the automatically generated while loop. I have seen that I can use event sructure or case structures. What would you recommend?  Is there an example I can refer to?

Thanks

Regards,

ES

[GerdW]

Hi ES,

I recommend to use a statemachine!

You already mentioned the states "start", "pause", and "stop". I would add the state "play" to the list…

[Emanuele_S]

Dear Gerdw

Do you have a simple example I can refer to?

Thanks,

ES

[GerdW]

Hi ES,

LabVIEW comes with a lot of examples, either in the example finder or in the "File" menu -> "New…".

So select the "New…" entry of the file menu and choose "VI" -> "from example" -> "frameworks" -> "pattern" -> "statemachine"!

(The mentioned items are rough translations to English as I use a German LabVIEW version, they can have slightly different names.)

[Emanuele_S]

Hello,

there's no state machine example in the English version of Labview. Maybe is it the Control Design?

[Blokk]

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@Emanuele_S wrote:

Hello,

there's no state machine example in the English version of Labview. Maybe is it the Control Design?

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There is. Did you check the example finder?? Another advice, forget the DAQ Assistant, and use proper DAQmx VIs in your state machine!

[Blokk]

Actually there is a DAQmx example ready to use for the purpose you described.

Open LabVIEW, and go to "Create...", then "Continuous measurement and logging" project. It just does what you need:

EDIT: sorry, wrong entry, you need the one with DAQmx:

 EDIT2:

[Emanuele_S]

Hi everyone,

thanks for your suggestions.

I have built a very simple state machine code, in which I can set three values

0 - pause

1-  acquire

2 - stop

I attach the code. I just would like to know if I can set a three-option button which makes me visually select these three states, instead of setting the numeric values 0,1,2.

Thanks again for your help.

Regards,

ES

[GerdW · Accepted solution]

Hi ES,

use an enum to name the states. Then use an enum indicator to indicate the current state…

[Emanuele_S]

I did that, it's better than before but I prefer to have three buttons: Pause - Acquire - Stop.

I think it's easy do to this, how can I?

ES