Write data to a logbook file only when a boolean indicator changes
Hello
I need to write my local variable state to a simple txt file only when it's true or false state changes.
for example, when my local variable 'temperature too high' is true, I need something like: temperature too high.
When it changes back to false i need: temperature OK. This with a date stamp.
It already worked to get a date stamp and to write the true or false state down but it always gets stuck in a while loop so the program keeps writing the same sentence.
Solved!
Go to Solution.
I had to take a picture with my phone because we're not allowed to connect the computers with an usb drive, I hope you can see it clear.
I know this while loop causes the program to write the same sentence over and over again but I don't know an other way to do it right.
Thanks
Attachments:
11166065_887284134650745_1225026485_n.jpg 46 KB
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How continuously write data to a txt file
hello,
first of all, sorry for bad English, but I have a problem to continuously write data to the txt file.... I have one 2D array with values of some function and based on 2 sliders (values of the sliders) i want to interpolate value using bilinear method... and after that value of the sliders, interpolated value, and value of the nearest points i wish to write to txt file ... for every 2-3 seconds perhaps it would be ideal to be formated as ::
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Go to Solution.
Attachments:
Proba.vi 21 KBHi there,
May I suggest you start with the LabVIEW tutorial? Or perhaps this one?
I say that because 1) you said you're new at this, and these tutorials are great for getting started; and 2) you don't seem to understand the concept of dataflow.
A structure, such as a loop or subVI or function, cannot start executing until it has all of its inputs available. Therefore, the loop which contains your file write (bottom loop) cannot execute until your top loop is done executing, because it depends on inputs from your top loop and those inputs aren't available until the top loop is finished. Thus, your file will contain only the data from your final top loop execution. You might be thinking that your loops are executing in parallel. They are not. Your file loop is executing after your data loop has finished...that is to say, your file loop executes exactly once, after you press your stop button.
You can do two things here to fix that:
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One other thing. Move the "open file" function outside the loop. Opening and closing the file in each loop iteration will cause problems. Open the file once. Write to it in each loop iteration. Close it when you're done. Like this:
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I wrote a code that contineously writes data to a text file. The problem is I am running this VI for long time and therefore this text file is being bigger in size e.g. more than 10MB. I want to split writing data in this text file after max 1MB size. Can anyone help ????
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In the servlet get (or post) method, use a code like this:
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I am building a system that is measuring the CO2 content of 12 vessels but only 1 CO2 gas analyzer. So, my system has a series of valves that only lets one valve open at time so that only one vessel is being measured at a time. What I would like to is have a measurement file for each vessel so I don't have to worry about determining which data came from each vessel. Also, I only want to write measurements to each file whenever its corresponding valve is turned on. The third thing I would like to do is to be able to read the data file and plot the trend data as the test is running. These test will run for 14 days. So what would you recommend to do this? Would you recommend using a Write to Measurement File Express VI, Write to Spreadsheet, Write to Text File, Write to XML?
Requirment Summary
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I am using a Consumer/Producer design with two consumer loops one for processing and writing the data and the other to control a pump for a waterbath that was made inhouse.
Thanks!
Attachments:
Producer-Consumer From Scratch2.vi 153 KBThis is such an open ended question...but I will give some advice.
If you plan on reading and writing to a file, dont use the write to measurement, you want to use the open/create/replace and close file functions. The particular file you write to can be either of those listed, but the text file will require all numeric values to be changed to strings, which is just more overhead to take care of. If I could recommend a type, it would be datalog files. They are great to organize your data. I don't see any reason to use XML. Do you want to be able to open and review this data later? Do Post-Analysis in Excel? Maybe write to spreadsheet is what you are looking for then.
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When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer.
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[pre]
This class contained some other functions i've deleted, but i think it still works.
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Regards,
Tif -
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I'd like to write two sets of data at different times(not simutaniuosly)into the same spreadsheet file. I tried to re-open the spreadsheet file which i created when i wrote in the first set of data, to write in the second set of data. But it didn't work. I don't know what's wrong with my program. I have selected APPEND when I tried to write the second set of data in the old file.
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Attachments:
easier_copy_of_my_program.vi 28 KB
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What do you think ?
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Hi
The programme below is a dual channel frequency analyser simulation which store the frequency, real, imaginary data into an ascii.asc file in a folder in the PC. For each teration of the loop a pop up comes requesting to replace the file with new data. I require to save the data of the iteration when the averages are completed of the Frequency Response Function (say the data after the 100 avarage). How can I link the append to file signal of the Write to spread sheet vi of the programme with the averages completed signal of the FRF vi of the programme. By doing this I will have the data after the specified average being done on the input signal.
Can some one help me on this.
Thanks
Mal
Attachments:
dualchannelspectrumanalyser-reimstore.vi 441 KBHello malkoba,
it's better than before, but not as good as taking the file write out of the loop. I cleaned up your vi a little bit...
At the moment you append to the file as long as the calculation runs. If the max number of averages is reached you want to replace your text file and will get a dialog window. Do you want to annoy the user with some unwanted dialogs? ("Replace a file? Why should I replace? I told you to write to that file!" and so on :-)
Best regards,
GerdW
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Attachments:
dualchannelspectrumanalyser-reimstore[1].vi 443 KB
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