How do you add 2 physical channels from the same control?

[BennyDe]

I really appreciate your patience and help. I just spent a bit reading up on the "export to spreadsheet Vi" and honestly have no clue how to incorporate it into this VI. Would it require a complete overhaul of what I already have in place? Also, why exactly are there 2 file paths?

[Dennis_Knutson]

Just wire it up to the waveform array from the DAQmx Read.

I'm not sure what you mean about two paths. There is an input and an output. If the input is blank, you get promoted for a path. This is what is output. You would use a shift register to avoid repeated prompts.

[BennyDe]

Here is an update. I figured out how to write them to the file in columns as desired. Now, I would like to add a real-time plot of each voltage input. I know the columns of data are in the orange wire (circled), I just dont know how to extract both of the plots from them.

Thanks!

[Dennis_Knutson]

So why did you change from nsamp with a precise sample rate to 1samp with a variable sample rate? Why did you get rid of the waveform data type?

[BennyDe]

I couldnt figure out compatibility issues with the waveform data type wires, so I tried a couple of the other settings and the 1D DBL Nchan 1Samp seemed to output what I was looking for in terms of the dataset. Is this a big no-no?

[Dennis_Knutson]

I have no idea what you tried. The output of the DAQmx Read would be wired directly to the export waveforms function. Nothing else would have been required.

When you switch to 1samp, you turn off the hardware timing. The time between samples is software timed and subject to a great deal of jitter because of Windows. It's up to you if it's enough.

[BennyDe]

Ok, what you said makes sense. Would the "export to waveform" and its inputs (file name, etc) be inside of the while loop?

[Dennis_Knutson]

Just the write waveforms to spreadsheet would be inside.

[BennyDe]

I am trying to link the file path from the Open/Create/Replace VI to the "export waveform to spreadsheet", but the wire is broken. Am I using the correct VI to open the spreadsheet file?

[Dennis_Knutson]

I don't quite understand what you wiring. All that you need is a file path control or the file dialog. The export function will open the file.