Writing to a data file with time stamp - Help!

[PierT]

I ran the program and it has an error when it reaches 12:00 am. IT says the file " todays date" does not exist.?

[PierT]

This is the error I get?

[ian_fung]

Hi

Please find attached Vi useful 🙂

Cheers!

[PierT]

Ian,
How do I integrate this into my existing program. Should I group my write file in the while loop or what...sort of confusing. Can you show me with my existing program.
Thanks

[Dennis_Knutson]

In the small case statement inside the while loop, I forgot to set the functon for Open/Create/Replace File to Create or Replace. It defaults to Open only so when it is time to create a new file, the error will appear.

[PierT]

Dennis,

I have already figured that out and made a constant for the open/replace vi. But unfortantely the original file keeps logging. I'm not sure why but the original one never closes. Any other suggestions. I have tried to put a close file in the case structure if the time = 12Am. let me know..

[ian_fung]

hi PierT,

I have integrated it into your VI without removing the original file IO functions.
You might, still, need to further polishing it 🙂

Cheers!

[PierT]

Ian,

Thanks for the help. I ended up doing it a different way but I guess either one will work. Attached is what I came up with.

One question I have is if there is a way for my program to have a delay before writing data to a .csv file after my trigger goes high and to stop the writing before the trigger turns off.

To specify more I have a trigger which tells my program to start logging data. Now my device takes 5 seconds to get a good reading so I have to start after 5 sec. And then when it turns off it takes about 5 seconds again. Any suggestions would be great. My trigger by the ways is 7sec on 2 seconds off.

Should I use shift registers? not sure?

[ian_fung]

One question I have is if there is a way for my program to have a delay before writing data to a .csv file after my trigger goes high and to stop the writing before the trigger turns off.

To specify more I have a trigger which tells my program to start logging data. Now my device takes 5 seconds to get a good reading so I have to start after 5 sec. And then when it turns off it takes about 5 seconds again. Any suggestions would be great. My trigger by the ways is 7sec on 2 seconds off.

Should I use shift registers? not sure?

---

Hi Pier,

I am not quite sure if I understand your problem faced as quoted. Nevertheless, please have a look at the attached VI. I have included, to the VI, a 5000ms timer, which starts timing when the Channel Data >= HighLevel Trigger. In this case, this next Channel Data which exceeds the HighLevel Trigger level will take effect only after the file save.

Hope this is clear 😛

Cheers!

[PierT]

If I need to take an average of the values that I read from my channels and take out any high readings and then write them out to a file, can i do that in a seperate case statement within the main?