Combobox data question

[cesarjr.1991]

HI everyone, I'm trying to use COMBOBOX to select what lamp ON, but I want to do it just once, if I try to ON again the same LAMP Labview will show an error message, Is it possible? Thanks

[RavensFan]

Keep track of how many times the selection has been made using a shift register.  If it is chosen more than the number of times you desired, then show the error message.

You may want to use an Event structure to determine when the button has been pressed.

[cesarjr.1991]

Yes, I'm trying to use it, but I'm new in it 😕 For a lamp get ON I need to know the letter that my COMBOBOX send, and push INICIO, I want to use each lamp once.

[natasftw]

I'd agree you want to look at the event structure.  That way, you're checking once for each value change rather than continuously polling as you're doing now.

That would allow you to carry a three element array, or cluster, on a shift register.  Initialize it all to false.  As each filter gets triggered, set that value to true.  That way, you could see if you've triggered it before rather quickly.  If you only want each to be done once, you could do an AND of the array as a stop condition.

[altenbach]

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@cesarjr.1991 wrote:

Yes, I'm trying to use it, but I'm new in it 😕 For a lamp get ON I need to know the letter that my COMBOBOX send, and push INICIO, I want to use each lamp once.

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• The shift register belongs in the outermost loop. Keep an array of three booleans.
• Your FOR loop does not do anything useful, delete it.
• What determines your while loop rate? Seems to be spinning loke crazy. Use an event structure as suggested.
• Why is it a combobox? Why not use a ring, enum, or radiobutton control?
• Keep all controls on the main loop diagram, not inside other structures.
• ...

If you want help, please attach your actual VI. We cannot debug pictures.

[cesarjr.1991]

Hi, this is my Vi, where I'm trying to do it, If I try to ON a lamp twice the program will show me a message, but I don't know how to do it 😕

[johnsold]

Here is a version using radio button, event structure, and an array of booleans.  It does not include the Inicio function.

Lynn

[cesarjr.1991]

Yes, but you're using buttons, Is it possible to do with a Combobox? the same thing, but with Combobox?

[RavensFan · Accepted solution]

It doesn't appear that you've tried any of the tips given to you.

See attached.

[cesarjr.1991]

Thanks! 😄 It works for me