signal filter

[vrock]

Is there a way to only get selected values from a signal? I am inputting data from a DAQ and would like to export each value only as i changes in the for loop. Right now, when I export the data there are many repeats of values. 

Thanks,

VL

[GerdW]

Hi vrock,

yes, there's a way!

You know LabVIEW is a programming language? So you can program a small filter routine that will only pass values that changed compared to their predecessor...

Btw. that's a nice way to learn LabVIEW 🙂

[vrock]

Thanks so much for your response! What block would I use to create a filter routine? Sorry, I'm knew to labview...

-VL

[GerdW · Accepted solution]

Hi vrock,

for the beginning I would use a FOR loop, a shift register, a Case structure with a BuildArray node inside...

[vrock]

How would I save a preceding value to use in the Case structure?

[GerdW]

Hi vrock,

I already advised to learn LabVIEW (NI offers free online courses!) and I already named shift registers...

[tannerite]

Hi vrock,

A shift register actually passes the last data (right side of loop) it received to the beginning of the loop (left side of loop). If you are familiar with text-based languages it is similar to an x = x + y instruction. www.ni.com/support has some good resources if you are new to LabVIEW and I would definitely recommend some online training course, as GerdW mentioned.