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reset control button

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Can I reset a control button programmatically?  Specifically, I'm wanting to switch a Boolean button back to a false state in response to certain events/conditions. 


For example, consider the attached VI.  (It is un-finished, because I don't know how to finish it.) The user can make the counter count by clicking the count button.  What I want to do is stop the counter at some number (10) and reset the count button, so the user has to re-click for a new count. 



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Message 1 of 12


also, change the mechanical action of the count switch to "latch when pressed or released"


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Message 2 of 12

Check out "Create... > Local Variable"

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Message 3 of 12

@tomlawton wrote:

Check out "Create... > Local Variable"

...and then DON'T create one.  Check out Apok's example instead...

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Message 4 of 12

think he wanted the "Count" button to remain pressed in- and the counter to keep counting- until n=10, or whatever- and then have the count button pop back out. In which case, I think he'll want a local...

(Might be wrong of course..!)

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Message 5 of 12
Accepted by topic author tysonl
08-27-2015 04:09 PM

This is one of those times some additional functions can be your friends.


Events, Property nodes and Feedback nodes should be loaded into any developer tool-box ready to replace the "Screw-Hammer" when a better tool exists.

Event Loop 18_BD.png

Count Value change event selects either -1 or 100 for timeout

Stop value change sets the exit condition


I renamed Count (I32) to Counts since its not very good to have two objects with the same label



I think he wanted the "Count" button to remain pressed in-  I read that too since the true string is "Counting" Still the Local is less desirable since a Val(Signalling) can be beneficial in this case

Message 6 of 12

@tomlawton - That is exactly what I'm wanting. 

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Message 7 of 12

In that case, right-click on your "Count" button terminal, "Create...> Local Variable". That gives you a "second terminal" to your front-panel control... which you can either read from, at a different place on the diagram (sometimes saves messy wires), or in your case, you can change it (with a right-click) to write mode , thus allowing you to force a value to your front panel control.

BUT- huuuuge BUT!- be careful! Use of locals can give rise to race conditions, and all manner of bad things. (Additional copies of data is a common refrain, which would be heinous for a big array, but acceptable for a single boolean). Plus they tend to elicit strong reactions among programmers; along the lines of Dijkstra/ GOTO...

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Message 8 of 12

i believe that Jeff's would be a better solution....

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Message 9 of 12

Undoubtedly- though I have only read the code, not run it (to paraphrase Knuth)

However, it's nothing like as transparent for a beginner to comprehend; and while we should encourage good habits (and discourage bad!), we don't need to intimidate.. ;-) (or optimise prematurely ;-D) 

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Message 10 of 12