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Obtaining Information From A WaveForm Graph

I have a waveform graph running that constantly taking in voltage measurements and producing a square wave on labview. My question is how would I write a piece of code that obtains the information "when the graph starts increasing". So to make it more clear, when the voltages start going up, I want a piece of logic that recognizes this so I could trigger something with it. Let's just say so I could trigger a stop function right now when the voltages start increasing on the square function

 

Thank you!

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Does this help? (LV2013)

CheckWaveform.png

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