Writing data to the file when the trigger is activated?

Similar Questions

• Writing data to the file trigger

  Hello

  I'm new to Labview and I'm having difficulty trying to make this work correctly.

  What I do is followed the release of a transducer and when it reaches a certain critical value I want to write data to a file.

  I have this part works fine, but I'm currently using a higher vi / equal to check the value against the flow of the instrument, so when the value is less than the critical it to stop recording.  I want to continue to save for a number of minutes after reaching the critical value.

  How can I do this?

  Look at using the Express VI of elapsed time.  So when the condition is met, it triggers the VI and it will keep logging data until the Express VI shows the elapsed time.

• storage, reading and writing data to the file

  Hello world

  I am new to the Labview and his community.  Asked me to acquire data on the measurement of the pressure using Labview.  I could build the code and got it working, but when I look at my data that has been collected, there no stopping point.  I just spent a lot of time looking at the data in the place where it begins and where it ends.  The question I ask is how to create a code to read the pressure, storage, in memory until there finishes, collect data and then to write in a .csv file.

  I use the NI USB-6009 case and hook upwards to ai0 and ai4.  See the attached code so uncertain.

  I want to record 100 data points and the system stops after these collection.

  Thank you

  John H.

  You have a certain time which means your VI will continue to run until you press your button to stop the loop.

  The DAQ Assistant is already set to 100 samples.

  Just delete the while loop!

• Writing data in the CSV file?

  I tried, but in vain, to write data in the CSV file, with the column headers of the file labeled appropriately to each channel as we do in LabView (see attached CSV).  I know that developers should do this same in .net.  Can anyone provide a snippet of code to help me get started?  In addition, maybe there is a completely different way to do the same thing instead of writing directly to the CSV file?  (In fact, I really need to fill a table with data and who join the CSV every seconds of couple).  I have the tables already coded for each channel, but I'm still stuck on how to get it in the CSV file.  I'm coding in VB.net using Visual Studio 2012, Measurement Studio 2013 Standard.  Any help would be greatly appreciated.  Thank you.

  a csv file is nothing more than a text file

  There are many examples on how to write a text using .NET file

• Writing data to a file of several functions of reminders.

  Hello

  I'm new to LabWindows and I try to save test data in a file where my project directory. I was able to save the data to test the function main cvicallback in result.txt but not the test data of another cvicallback function that were called by the function main cvicallback in result.txt. Can someone tell what I'm doing wrong here? Here's what I have in the main call feature cvi back.

  GetProjectDir (path);
  MakePathname (path, "result.txt", path);
  FID = fopen (path, "a +");

  status is fprintf (fid, 'Test data' or hand CVICallback message);.

  fclose (fid);

  And here's what I have in the other cvicallback who was called by the main function of cvicallbak.

  FID = fopen (path, "a +");

  status = fprintf (DIF. "The data to test the CVICallback another message");

  Thank you

  Yuna

  Yuna:

  Do you get any error messages?

  How is the second function called?  Are you sure it is called?  You can set a breakpoint on one of its lines of code to make sure.

  You must post more code to get the bigger picture.

  Is the overall or is path - this local to your hand?

  If pathname is local, how it is passed to the second function?

  You close the file in your second function?

  I'm guessing that it's just a typo, but the fprintf in the second function shows a period after that IDF and there should be a comma.  You are better to paste the code in your message instead of having to retype.

• Problem in writing data to flat file

  Hello
  
  I created a table as the source interface and the file as a target. My interface has been around for a long time, but it's not write data to the file. Any clue?
  
  -Chikk

  Hello

  Please, take a look if the target file is locked.

  Try to remove and put the 'Truncate' revenge option to yes.

  Cezar

• Writing data in the text file or excel spreadsheet

  Hello

  I have a silly question to ask questions about the writing of data in a text file or a spreadsheet. I have an example that simulates a sine-swept DAQmx. The output it provides is the (amplitude and phase) frequency response function that is plotted on a graph (see VI) attached. I like to use these data for further analysis by transmitting the data to a text file or a spreadsheet. I've tried a few things, but the thread is broken. I guess I use the sink badly - so I was wondering, can you please advise me on what sink should I use?

  Your help would be very appreciated,

  Thank you very much

  REDA

  The wire is broken, because you cannot connect this type of data to one of these two functions. The data source type is a table 1 d of the clusters, where each cluster contains two tables. The text file write accepts strings, not clusters. Writing on a file action accepts dynamic data, and while you can convert dynamic data tables, there is no built-in mechanism to convert a table 1 d of the clusters of two matrices.

  What you need to do is to convert the data in a format which can be accepted by these functions. Since you want to have a "spreadsheet" file then you should use writing to the spreadsheet file that creates a delimited text file. Since the frequency data would be the same for the plot of the magnitude and phase diagrams, you can have 3 columns: frequency, amplitude, and phase. You can take off the items using Unbundle by name, and then create a table 2D of each element of the cluster. The real question is to know if you want to save the data at each iteration and if you simply add on the file. The attached figure shows write an initial header and then adding just streaming the data.

• writing data to the file of measure

  Hi all

  I'm trying record rpm with an encoder in quadrature (200 ppm) in a LVM file with a timestamp of each saved value. It seems to work, except that it registers more values in the file LVM I want. I put the DAQ Assistant to save read 1 sample at a frequency of 1 Hz. However, when I open the file LVM generated by writing custom file Express VI, sometimes I get 42 values per second, sometimes I get 13 and so on. If I don't get a constant number of measurements per second. How can I specify just measure of folder 1 per second, or 5 measures and so on?

  I'm using LabVIEW 2011. The encoder values be read as a frequency and then converted in rpm. Thank you! Files and images attached.

  Your Express VI is not configured to play at 1 Hz. The synchronization method is the default value, which is used for the reading of the frequency as you do. This basically means you're sampling on the rising edge of the input signal, then you're really sampling rate at the same rate as your frequency.

  To do what you want, you can change to mode 1 sample (on request) and add a 1000ms waiting your loop.

• Problem writing data to the file that is inside the SD card.

  Hello

  I am trying to write the data to a text file that was inside the SD card in my application.

  Everything worked well. If once I connect my camera to the PC via a USB port, then unplug the unit that also data are not added to the file system. Please can someone help me solve this problem.

  Thank you

  Schott Perfecto

  1 single source can access both microSD card.  So if the BlackBerry Smartphone is connected to a PC and mass storage mode, your application will not be able to access the microSD card.  Mass storage mode allows your PC watch the microSD as a drive on your PC.  It is configurable in the Options of the device.  You can set it to on, off or invites.

• writing data to the worksheet

  Hi all

  I am trying to extract frequencies to help extract information from your multiple. However, I am facing problem record the frequency, amplitude, and phase in the file. Give me an error (it can't be wired together as their data types (digital, string, array, cluster, etc.) do not match.) View the contextual help window to find out what type of data is required. The type of the source's queue Refnum. The type of the sink is Dynamic Data).

  I have attached the file. Could you please help at this stage.

  Khalid

  In the 2D case of amplitude, frequency and phase table, you should unbudle the cluster by its name and integrate these elements build table functions. For your reference, I did sort of thing in your code. You can see the attachment.

• To access the data of the trigger list item

  Hello

  I started developing on the Blackberry this fall. I like a lot more on Android and Java development, but am really interested in getting on learning stunts and QNX architecture.

  I wanted to take the child node in the following XML file (from the Documentation):

  Here is my list:

  ListView {
                  dataModel: XmlDataModel {
                      source: "data.xml"
                  }
                  onTriggered: {
  
                      if (indexPath.length > 1) {
                          var chosenItem = dataModel.data(indexPath);
                          var contentpage = itemPageDefinition.createObject();
  
                          contentpage.itemPageTitle = chosenItem.name
                          contentpage.phoneNumber = chosenItem.phone.number
                          nav.push(contentpage);
                      }
                  }
                  accessibility.name: "Listing"
              }
  

  I put phoneNumber as an Alias in the QML file that the application is intended to be sent.

  the chosenItem variable is a variable of XmlDataModel made from a contact form we have clicked on that, but I have no idea how the child of this body of the access code. I should do data() once again, or is there a much more direct way from words to action?

  Thank you in advance for the help,

  Sorry, the answer I gave was not for a XmlDataModel, between the XML and by default displays only the first two levels.  Other levels is available via the datamodel, but not returned as the selected item.

  To get to a different level to get the phone number you may enter a value of something like this:

  //First phone number
  dataModel.data([0,0,0]).number
  
  //Second phone number
  dataModel.data([1,0,0]).number
  

  The row you get will look like [0,0] or [1.0] because it is not crossed to the third level.  You will need to do a little analysis, take the first value of the row and the replacement of the first value that I've hardcoded above.

  Have a look at the diagram on the page of response to selection .  Which will help you understand what is happening behind the scenes here.

• faced with the question when writing data to a flat file with UTL_FILE.

  Hi gurus,
  
  We have a procedure that writes the data from the table to a flat file. RAC is implemented on this database.
  While writing data if the current instance, this procedure creates two copies of the data in parts.
  
  Any body can help me to solve this problem.
  
  Thanks in advance...

  I also asked this question, but it seems no final solution...

  In any case, here are two possibilities
  (1) the directory for the file among all nodes share
  (2) run you a procedure on a specific node

• two digital to write data to the power file triggers

  Hello

  I am currently building a VI to use two digital front as triggers posted the pic to start and stop writing data to the file.

  When start trigger is activated, the data is written to the file, it goes indefinitely until the stop trigger is on.

  If someone give me some advice, they will be appreciated.

  Hi Jetfire,

  you know the difference between BMP and JPG?

  Size! (And this is the reason why BMP is not allowed in this forum.)

  Just you rename a file does not change the dataformat. Please attach real JPGs (or better yet the PNGs) next time!

  Jetfire created a related thread, now with a VI instead of an image...

• Try to write data to the file, but error 200279

  I have problems when writing data to a file. 10 seconds in the recording process, I get the error 200279. I did some research on the subject, but I am unable to corect my code. I think I want to increase the size of the buffer, but he prefers, I suppose, to read the data more frequently. The way that I save my file is, before starting the VI, I attribute a location and name of the file (e.g. data.csv). The date and time is added at the end of the actual when file the I start to record the data (e.g. data_07-26 - 13_122615.csv). If the file does not exist, it creates a new file, and then adds the data of this file after each iteration of the loop. The reason why I did this way was so I don't have to worry about running out of memory, but apparently my code is wrong.

  

  

  I will include a copy of the faulty section of my code. Any help would be greatly appreciated.

  Thank you.

  Your problem is that the writing on the disk is slow.  It is pretty slow so it causes your DAQ buffer overflow and cause error and loss of data.  What you need to do is to implement a producer/consumer.  This will put the data acquisition and recording on the disc in separate loops.  This will allow data acquisition work at speed, that he needs to deal with incoming samples and writing on disk can run at all what pace, he can.  You send data from data acquisition to the loop of logging using a queue.

  You can also think about changing how you write to the file.  VI is constantly open and close the file, which is a very slow process if you do it inside a loop.

• How can I write snapshot of my data to the file measured every 5 seconds

  Hello

  I try to take a snapshot of my stream once every 5 seconds and write it to a. File LVM. I have problems with the VI "write to a measurement file. The pace at which it writes data to the file seems to be dictated by the 'Samples to Read' parameter in the DAQ assistant. I tried placing the VI 'Write in a file measure' within a business structure and the launch of the structure to deal with a "time up" VI. As a result only in a delay of 5 seconds before the insiders 'Write in a file as' VI. Once the VI 'Write in a file as' is launched, it starts writing at 20 x per second. Is there a way to change it or dictate how fast the exicutes VI 'Write in a file measure'?

  My reason for slowing down the write speed are, 1) reduce space occupied by my data file. (2) reduce the cycles of CPU use and disk access.

  The reason why I can't increase the value of 'Samples to Read' in the DAQ Assistant (to match my requirement to write data), it's that my VI will start to Miss events and triggers.

  I don't know I can't be the only person who needs high-frequency data acquisition and low-frequency writing data on the disk? However, I see a straight road to key in before that.

  The equipment I use is a NI USB DAQ 6008, data acquisition analog voltage to 100 Hz.

  Thanks in advance for your help

  See you soon

  Kim

  Dohhh!

  The re - set feature has not been put in time elapsed VI!

  Thank you very much!

  See you soon

  Kim