If Switch is on, toggle action/led once.

[riahim]

I'm trying to make it so that if I turn a switch to the on(true) position, then an led toggles on just once before turning back off. I can't figure out how to have it toggle rather than just stay on. also, I cannot change the action of the switch to only turn on while the switch is being held closed as I need that switch to work with other parts of my code. Any advice?

[GerdW · Accepted solution]

Hi riahim,

search for the Pt-By-Pt-BooleanCrossing function…

[RavensFan]

Shift register or feedback node.  Compare new state of switch versus previous state.

Or use the Boolean Crossing Pt by Pt subVI.

[riahim]

Thanks, I'll take a look into the boolean crossing.

edit: Am I missing something? Currently, I can see the input toggle inside the boolean crossing function, but nothing is triggered...

[GerdW]

Hi riahim,

why do you constantly reset the boolean crossing function?

(What is this boolean TRUE constant good for?)

[riahim]

I don't want to constantly reset the function. I figured I needed a way to initialize the boolean crossing, but now you bring up a good point. Do I only need to initialize it once or can I leave this disconnected...

[GerdW]

Hi riahim,

you have several options:

- leave it unwired

- init by comparing loop iterator "i" for "=0"

You should also put a small delay (aka Wait function) into the loop. No need to iterate as fast as your CPU allows…

[riahim]

Thank you! It is now working

[altenbach]

If you don't need all that extra functionality of the ptbypt subVI, all you need is a simple feedback node as follows.

(That's what I typically do :D)