Re: save data to file at a slower sampling rate

As a starting point, I would recommend you to look at the shipped examples t
hat come with LabVIEW. You can find the shipped examples by looking under He
lp>>Find Examples>>Hardware Input and Output>>Daqmx>>
;Analog Measurements. This
would be a good starting point for you.
 
I editted the Cont Acq&Graph Voltage-Int Clk.vi for your requirements. P
lease refer to the attached VI for the editted example.
 
I hope this helps!
 


Cont Acq&Graph Write to Spreadsheet.vi:
http://forums.ni.com/attachments/ni/170/310235/1/Cont Acq&Graph Write to Spr
eadsheet.vi

Thank you very much and sorry for the delay in getting back to you.  I 
have a couple more questions.  Is there a way that I can strip the bund
led data to just have the voltage because i don't need the timestamp as it u
ses too much memory for my
low end DAQ.  I keep getting an error that data has been overwritten an
d is no longer available.  I would also like to slow the sampling rate 
down even more to 1 sample per second but still keep the waveform constant.&
nbsp; Thanks again
Jordan

I tried to unbundle the data but it is the wrong type of data i guess. 
 All I want to do is display the waveform and save the voltage in excel
 file at 1 sample per sec.  Thanks
Jordan

Thanks for the help that worked perfectly.  My only other issue is slow
ing down the rate that samples are written to the spreadsheet I only want to
 have them written once a second.
Thanks again,  Jordan

Hi Jordan,
you could insert a case structure and only write every 10th value to the fil
e. The advantage is that you anyhow see all value in your Waveform.
Hope this helps.
Mike


Cont%20Acq& Graph%20Write%20to%20Spreadsheet[1]_LV80
.vi:
http://forums.ni.com/attachments/ni... />
preadsheet[1]_LV80.vi

hello again, thanks for the help i really appreciate it.  I couldn't se
em to get the case structure to work properly, I've attatched a section of t
he program where i'm trying to do what you suggested.  Maybe you could 
implement the case structur
e to make it work.  Thanks again
Jordan


spreadsheet.vi:
http://forums.ni.com/attachments/ni.../spreadsheet.vi


doit2.xls:
http://forums.ni.com/attachments/ni...587/2/doit2.xls

Yours is just reading in the whole array, and giving you the entire array ba
ck from the 0th row, 0th column.  The loop will only run once because t
he entire file is read at once and will hit the EOF in the first iteration.
 
Look at this instead.
<img src="http://forums.ni.com/attachments/ni/170/312609/1/spreadsheet[1]_BD
.png"> Message Edited by Ravens Fan on 04-01-2008  12:16 AM


spreadsheet[1]_BD.png:
http://forums.ni.com/attachments/ni...9/1/spreadsheet[1]_BD.png

I tried your example and I still got all the values.  It basically copi
ed the whole first row and removed the second.  There must be something
 I'm missing
Thanks
Jordan

I think I see what is happening in your data.  You have each data point
 by column so that the data stretches to the right in time rather than down.
  I didn't catch that when I wrote up the VI.
Put a transpose array function before and after the loop.  This will sw
ap row with columns temporarily so that the loop will effectively act on the
 other dimension.

Oh My!!...it works.  I set the transpose on the read spreadsheet to tru
e and now it works beautifully.  Thanks for everyones help, much apprec
iated.
Thanks again,  Jordan