Data logging

[tjuy]

Hi there,

i was trying to save data from three different sensors at the end of while loop (auto indexing) in a single spread sheet. i tried conncting all the thrree using build array and then to the write to spreadsheet vi, but im not getting the result i wanted to see. can somebody help.

Regards,

tjyu

[crossrulz]

What is wrong with your data format?  Could you share some code so we know what you have?

[udka]

Create an indicator after Build array just to ensure you have data in array and what data is present in array.
-What is the result you wanted to see and what is written to spreadsheet?

[ktg183MpBa]

I expected to see three columns each of 5000 rows as i acquired data at the rate of 1000Hz for 5 seconds instead i had 3 columns each of a single row. thanks

I eddd

[NIquist]

You probably just stored the very first or, more likely, very last value because you didn't build your arrays correctly.  We can only guess until you post your code.  Post your VI itself, not a picture please.

[RTSLVU]

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@tjuy wrote:

Hi there,

i was trying to save data from three different sensors at the end of while loop (auto indexing) in a single spread sheet. i tried conncting all the thrree using build array and then to the write to spreadsheet vi, but im not getting the result i wanted to see. can somebody help.

Regards,

tjyu

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Sounds like you are doing it wrong. That's about all the help we can give without seeing your code.

But without seeing anything, I have to ask why are you only writing at the end of a while loop?

Assuming you are taking measurements on every iteration of your loop, you should also be writing a line of data to your file on every iteration of your loop. 

[tjuy]

Hi there,

find attached is the VI. for both cases (inside and outside the Loop) i expected to see 2 columns of 176400 rows each in the file using a sampling frequency of 44100Hz running for a period of 4 seconds. for the case of outside the loop , i used shift registers to be remembering the previous stages of the wafeform. please help in both cases so that i can go for the most cost effective one (memory).

Thanks.

[crossrulz]

Use the Export Waveforms To Spreadsheet File VI instead of the Write To Spreadsheet File.

[JÞB]

Let me guess,  You are really getting errors out of the Append Waveform.vi since the dT's do not match.  (1/44100 != 22.7e-6)

[ktg183MpBa]

The problem is not exporting the data, is all about what vi can i use to concatenate the waveforms and have them in a seperate columns in the file (was meaning saving all the waformsin one file).

Thanks.