[begginer] start button executing sub vi only once

[JohnnyB.]

Hi, I'm very confused by, what it looks, very simple task.

I have a piece of code and I need to plug it to "start" button which will execute it once when button is pressed, execute once again if I press the button again and so on.

I tried with "while" loop and true/false button connected to it but, as you know, code inside the loop executes itself continously as long it's true which is incorrect, it doesn't stop when it should.

I woul'd like it like that: Press start->code in block executes once and thats it, no more unsless I press the button again..

Please advice.

ps: I attached piece of vi I need to connect with button. It actually works as inteded but I fail to make it executable with button.

[Artemiss]

You should surround your code with an event case structure in a loop, with the case being value change of your front panel control.

[NIquist · Accepted solution]

An event loop is the way to go but since you're a beginner; this is the basic, simple way:

You need to right-click the button and change the mechanical action to latch when pressed (or released) to run just once.  If you set it to switch it will toggle.

[tbob]

Very simple.  See the attached code. I've added a loop, case structure, run button, and stop button.

Edit:  My code is exactly what Niquist published.  Remarkable.

[NIquist]

---

@tbob wrote:

Very simple.  See the attached code. I've added a loop, case structure, run button, and stop button.

Edit:  My code is exactly what Niquist published.  Remarkable.

---

Great minds think alike, tbob! 

[FrancoM]

Please, Can you post this VI in LabVIEW 2009??

Thanks

[EvenDeejay]

Here you go, 2009 version. note that one file is missing.