boolean counting?

[glskinner]

Good morning, I'm a novice to Labview so take it easy on me. What I'm trying to do is: Run a while loop after 1 true, 1 false and 1 true boolean. I'm trying to start a measurement when a digital input off a TTL goes high the second time, so I can get a good zero reading. I've searched the forums but can't get a grasp on what I'm doing exactly. Any help would be greatly appreciated.

[GerdW]

Like this?

(It's a snippet!)

[glskinner]

what's the red/green icon? I've never seen that. And how would this be implemented for a while loop to run?

[GerdW · Accepted solution]

Hi skinner,

that's why I wrote: IT'S A SNIPPET!

[glskinner]

It worked! Thank you, Gerd!

[glskinner]

my only issue is that it's not counting correctly. Sometimes when the input is true, the counter reads false...and other times it reads true.

[GerdW]

Hi skinner,

dunno what you're talking about...

Show your VI!

[glskinner]

here it is! 😄

[glskinner]

I need the measurements to run after 2 trues from the digital input

[GerdW]

Hi skinner,

- using the STOP function is completely wrong here...

- you're not obeying the DATAFLOW: how will you detect any DI signal changes in your loop when you don't read in your DI signal in the loop?