How do I zero the signal?

[kyoha]

Hi!  This is my first programming project (LabVIEW or otherwise), and I think know what I want, but I don't know how to do it.

I am graphing and recording the displacement of a laser, and I want to be able to "zero" the measurements when I press a button. 

Right now, I'm using the Basic Serial Read Write.vi from the examples, only I added a waveform chart so we can see the displacement change in real time.  It works and plots the output from the laser sensor, but I want to be able to hit a button that captures the displacement at that moment to create a reference and subtract it from the signal as it streams in and graphs the difference between the two.   I don't know how to actually do this in LabVIEW, or if this is the best way to do it, but I'm open to suggestions!

Any help is greatly appreciated!

[Harold_Timmis]

you could zero the graph:

[Cory_K]

Harold I think you missed what he was trying to do.

@OP: You are trying to calibrate the machine to subtract a baseline value, correct?

Take a look at the attached VI and see if it is what you wanted.

[Harold_Timmis]

thanks cory, I think I read it a bit to fast lol

[Cory_K]

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Harold Timmis wrote:

thanks cory, I think I read it a bit to fast lol

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Its alright, reading and writing are for text programmers anyway 

[kyoha]

Thanks Cory 🙂

Message Edited by kyoha on 09-23-2009 01:53 PM