topic Re: gray out switch in LabVIEW

gray out switch

drek123 — Tue, 20 Oct 2015 07:34:23 GMT

Dear,

Does any know how to do it , when i use the switch the led should stay on and the switch should be grayed out

Re: gray out switch

Norbert_B — Tue, 20 Oct 2015 07:44:25 GMT

That VI is simple..... TOO simple.

You require a loop in the code (don't forget a time delay!). And you have to learn about properties of controls.

Did you walk through the online training material for LV or attend a class at NI? If not, please do so!

thanks,
Norbert

Re: gray out switch

drek123 — Tue, 20 Oct 2015 07:49:55 GMT

i know about the property nodes but but once someone hits the switch the switch should be grayed out and the led should stay on,

so i dont know why i should use a timed loop

Re: gray out switch

GerdW — Tue, 20 Oct 2015 07:51:56 GMT

Hi drek,

but once someone hits the switch the switch should be grayed out and the led should stay on

IF button THEN
  GrayOut(button)
  LED:=TRUE
ENDIF

so i dont know why i should use a timed loop

No, you need to use a loop. The timing is just needed to not hog your CPU…

Re: gray out switch

Norbert_B — Tue, 20 Oct 2015 07:59:31 GMT

Next thing to consider:

If the button is grayed out, it cannot be used anymore by the user. You should add code to re-enable the button and another code to stop the VI.

DO NOT USE RUN CONTINUOUSLY!

Norbert

Re: gray out switch

drek123 — Tue, 20 Oct 2015 08:03:41 GMT

it is just what i wanna do, gray out the switch so the user cant use the switch no more until end of program

Re: gray out switch

T._P_Titherington — Tue, 20 Oct 2015 12:07:30 GMT

Hi,

What is this application for? Good practice would be to use the Queue Handler project. It’s a steep learning curve but it’s well worth it. This way you can make use of the event handling loop to reframe from constantly polling and to easily implement your grey out. If you don't want to go down that path here is an image of a way to perform this task using a case structure and shift registers. I highly recommend you look into the examples.

Re: gray out switch

drek123 — Tue, 20 Oct 2015 13:06:02 GMT

i know how to make the property node Disabled but not how to make the bleu Disabled and grayed out function

thx very much already

Re: gray out switch

GerdW — Tue, 20 Oct 2015 13:12:39 GMT

Hi drek,

how do you create a constant in LabVIEW?

Usually you right-click an input and Create-> constant…

Pretty basic LabVIEW stuff: did you take the free beginner courses?

Re: gray out switch

drek123 — Tue, 20 Oct 2015 13:16:27 GMT

You mention enum constant i guess

Re: gray out switch

drek123 — Tue, 20 Oct 2015 14:20:55 GMT

that circle at the selector what kind of function is that ? at pin s

Re: gray out switch

Norbert_B — Tue, 20 Oct 2015 14:23:19 GMT

Pin S? You are talking about the '?' from the Select function?

I think you are talking about "First Call".....

Norbert

Re: gray out switch

drek123 — Wed, 21 Oct 2015 06:30:03 GMT

dont fibd the first call function in labv7

Re: gray out switch

drek123 — Wed, 21 Oct 2015 07:05:57 GMT

found it sry

Re: gray out switch

drek123 — Wed, 21 Oct 2015 07:23:50 GMT

made this , but the switch wont gray out

Re: gray out switch

GerdW — Wed, 21 Oct 2015 07:31:18 GMT

Hi drek,

I repeat my message #9: constants are created by right-clicking an input and selecting Create->Constant.

(Do you read our comments? Do you understand them? Did you take the free online courses to learn LabVIEW basics?)

Creating an enum on your own with just one entry will be senseless, when LabVIEW expects something different here!

Re: gray out switch

drek123 — Wed, 21 Oct 2015 07:33:57 GMT

sry Gerd have to learn much , like this than, but does not work stays always on 0

Re: gray out switch

GerdW — Wed, 21 Oct 2015 08:06:49 GMT

Hi Drek,

repeating again: create the constant by right-clicking the property node input. RIGHT-CLICK! CONTEXT MENU!

If you insist on creating an constant on your own you should read the context help of the property node to create the correct constant…

Re: gray out switch

drek123 — Wed, 21 Oct 2015 08:23:23 GMT

i know how to create a constant but dont know what you are saying 😞 sry have to learn

Re: gray out switch

GerdW — Wed, 21 Oct 2015 08:43:49 GMT

Hi drek,

how did you create this constant "0"? My LV2011 shows a coercion dot for that property node input…

Did you read the context help as suggested before? Do you know what happens when you write a zero into this property?

sry have to learn

Reading the (context) help might be a good starting point…