FORCE STOP WHILE LOOP WITH TIME DELAY

[dragonknight255]

Hi Guys,

 I'm doing a project that will datalog the voltage reading from Arduino A0 pin. The arduino will read the voltage reading every "N" times (depends on time delay) and save the overall reading into excel. The problem is, I can't stop the VI anytime I want.

seems like it will wait first before the delay is finished. see the attached picture

[GJMABerends]

Put the time delay in the false case of an case structure. Wire the stop button to the terminal of the case structure. I have build an example

[GerdW]

Hi Gert-Jan,

you still can't stop your loop when the delay function is called!

@dragon:

Better try something like this:

(ElapsedTime is set to auto-reset.)

[GJMABerends]

So to abort the delay you can abort the SubVI.

[GerdW]

Hi Gert-Jan,

usually you don't want to abort a VI somewhen in the middle of doing something important…

(What does Wiebe say about your recommendations? :D)

[crabman]

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@GJMABerends wrote:

So to abort the delay you can abort the SubVI.

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I think it is best practise to use the abort VI function only if you have absolutely no ther option.

[GJMABerends]

Hey GerdW

Probably he doesn't agree. I agree these suggestion that I made were not great. I should pause and look at the problem more carefully before I suggest a solution. I assumed that the question was about stopping a Time Delay without thinking about the actual question.

The first solution has indeed the issue that it doesn't stop an already started time delay. The second solution stops the time delay but forces the application off while not closing references properly. 

[wiebe@CARYA]

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@GerdW wrote:

Hi Gert-Jan,

usually you don't want to abort a VI somewhen in the middle of doing something important…

(What does Wiebe say about your recommendations? :D)

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Well, "Abort" is about the only way to stop a time delay. So I think it should be the accepted answer!

Let's stay on topic for once! How to avoid having to stop the time delay is another (the correct) question.

[Yamaeda]

Place the code in an event structure in the timeout case (timeout = rate), then you can have a Stop Value change event that'll stop at any time.

/Y

[wiebe@CARYA]

I think it's suppose to run on Arduino (not sure), so no event structures.