LabVIEW
How to make one LED ON at a time by keeping all others off ??
Solved!
@Saqib51 wrote:
I had made a VI in which one LED is ON at a time by keeping all other low at the same time... VI works OK but when i try to use this VI as subVI its not working.....kindly help. i am also attaching VI with post....
No, your VI also allows none at a time. How should the subVI handle the situation when two LEDs are being changed between calls? What should the state be before it is called (all FALSE? Wait for first call and use that?, State from the previous run in the same session? etc.).
Is the front panel of this subVI hidden or interactive?
Here's a quick draft that could give you some ideas. The "not equal" finds the first changed LED and the rest updates the indicators as needed. Depending on your needs, you might want to initialize the feedback node with a suitable value. (Note that I don't write back the final value to the inputs, because these will be overwritten by the next call anyway. You need to handle that in the caller if needed. Personally, I would change the inputs to an array of three booleans. Less clutter!
(Note that there is no need for sequences, local variables, or event structures. The event structure belongs into the toplevel UI if needed.)
You have actually explained quite well what you are trying to do, and simply confirmed it with your latest post. Radio buttons are the way to go. Refactor your code to use them if you need to, because they are very simple to use. No sense re-inventing the wheel.
@Saqib51 wrote:
i need this type of functionality that i want to achieve....
Yes, that's just a radiobutton control as has been mentioned. No code needed.
By just loooking at the radiobutton in the palette, you might not realize how powerful and flexible they are.
A radiobutton is just a container that can only contain booleans of any number, shape or form. Whenever one is turned on, all others will go off.
The data itself is like an enum, with the labels of all the booleans in the order they are in the container (you can change the order if needed).
Basically, all you need to do is drop a radiobutton control, then drop your three booleans in it and remove the existing booleans. See also this idea.
