Why push button and stop button does not work in the structure of the casing and buckle my VI? (code attached)

I am a beginner. I'm trying to create a simple VI only switches beetween two types of signals like sine and triangle when someone press on the push button and at the same time, save the data in the file to my desktop. I also have a stop button which no longer record data.  Here are my questions and dproblems:

1. when I press the button, it does not the true and false in the structure of the case so that I can see the triangle wave stops and begins the sine waveform table.

2 when I press the stop button, I want the program still running, but the process of writing data in time the loop stops. I don't mind if the graph of the wave stops too but it would be better for the user to see the wave form is running, but the data will stop recording.

3. Although the condition of the loop did not accept the local variable for the stop button inside the loop or within the structure of the case, so I put the button outside all the loops and the structure.  (I know that this is a problem, I do not know how to use a single button several times in a single code. The local variable did not work the world premiere? I have to?)

4. the data file it creates hase a lot of lines and columns. I expect a time column and a column of mixed signals based on the push button amplititude this user press every time.  I did that with the acquisition of data and a sensor, it automatically gives me the voltage and time in a column. I tried 2D and 1 d and it has not changed anything.

Thank you for your help

Like you said, you read only your entries at the beginning, then whatever value they had before you hit run is worth to be seen by the rest of the code. Programming LabVIEW is based entirely on the data flow and parallelism. It is incredibly powerful and has led to its success over the years (coupled with graphical programming), but is usually one of the first things the new developers stumble on. This is a simple resource to familiarize themselves with its functioning. The function to highlight execution is a great way to watch how your application uses data streams.

Simple code goes like this:

  • Containing the main code of while loop

    • Inside of the whole loop is all user interaction code or modify the code entry
    • Stop the terminal loop is attached to stop certain criteria or user selection of a stop button
  • Loop initialization above all if necessary
  • Closing referrals and communications, etc after all loop

It's very simple code. If you want to watch in more advanced architectures that are scalable, Google "LabVIEW State Machine" or "LabVIEW producer consumer."

If you are just starting, you should do a free training have the capabilities of LabVIEW.

"Give me six hours to chop down a tree and I will spend the first four sharpening the axe.  -Abraham Lincoln

Here are some free training focused mainly on LabVIEW and hardware tools to help get started.

Training center of NOR

NEITHER start-up

-Hardware Basics

-Guide of MyRIO project Essentials (a lot of good simple circuits with links to youtube events)

-LabVEW databases

-DAQ Application tutorials

-CRIO Developer's guide

Learning OR training videos resources

Introduction to LabVIEW for 3 hours

Introduction to LabVIEW for 6 hours
Paced self-study for students
Self Paced Training beginner to advanced, required SSP
LabVIEW training Wiki

Tags: NI Software

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