basic labview programming

7/21/2019 Basic LabVIEW Programming

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Telemark University College

Department of Electrical Engineering, Information Technology and Cybernetics

Faculty of Technology, Postboks 203, Kjølnes ring 56, N-3901 Porsgrunn, Norway. Tel: +47 35 57 50 00 Fax: +47 35 57 54 01

Basic LabVIEW Programming

HANS-PETTER HALVORSEN, 2011.09.29



PrefaceIn this document you will learn basic LabVIEW programming by creating some

simple LabVIEW applications.

LabVIEW is a graphical programming language created by National Instruments

(www.ni.com).

For more information about LabVIEW, please refer to the Tutorial

“Introduction to LabVIEW”: http://home.hit.no/~hansha/?tutorial=labview .

For a flying start, watch this video (LabVIEW Quickie!):

http://home.hit.no/~finnh/videos/topics/labview/labview/labview.html

http://www.ni.com/

http://www.ni.com/

http://www.ni.com/

http://home.hit.no/~hansha/?tutorial=labview







http://www.ni.com/



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http://home.hit.no/~hansha

Task 1: Simple Calculator

Create the following simple program that adds 2 numbers:

Simple Calculator.vi

This simple calculator will add 2 numbers together.

Front Panel:

Add 2 Numeric

Controls and name them

“Number1” and “Number2”

Add a Numeric Indicator

and name it “Answer”

Block Diagram:

→ Add a “Add” function from the Functions palette:



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→ Connect (wire) the different objects together like this:

→ Push the Run button in the Toolbar to do the calculations.

→ Extend your calculator (make sure to rename your file) so it can handle the 4

basic calculations (Add, Subtract, Multiply, Divide).

Front Panel:

Calculator.vi

For selecting the different Operators (“Add”, “Subtract”, “Multiply”, “Divide”),

you should use an “Enum”:



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→ Enter “Add”, “Subtract”, “Multiply”, “Divide” inside the “Enum” (right-click

and select “Add Item After”).

Block Diagram:

The Block Diagram should look like this when you are finished:

→ Use the “Case Structure” for this.



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→ Wire the Enum (“Operator”) to the sign on the “Case structure”.

→ Push the Run button in the Toolbar to do the calculations.

[End of Task]



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Task 2: While Loop

Create the following program:

While Loop.vi

The program will update the date and time each second using a While loop

until you stop the program using the Stop button.

Front Panel:

→ Add 2 String Indicators and name them “Date” and “Time”.

Block Diagram:




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While Loop:

→ Add a While Loop to your program.

Get Date/Time String:

→ Use the “Get Date/Time String” function in order to get the current Date and

Time from the computer:

Wait (ms):

→ The Date and Time strings should be updated every second. You can use the

“Wait (ms)” for that:

[End of Task]



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Task 3: Advanced Calculator


Advanced Calculator.vi

Front Panel:

→ Add the User Interface objects as shown in the Figure above.

The calculations will be performed when you click the “Calculate” button.

Block Diagram:

You need to use the following in your program:

While Loop:

Event Structure:

Add an “Event Structure” inside the While Loop.



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[End of Task]



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Task 4: Arrays


Arrays.vi

Front Panel:

Creating an Array:

→ Start by dragging an empty array into your Front Panel and drag aNumeric Control inside it:

→

→ Enter some data inside the array.

Block Diagram:

Index Array:

→ Next we will use the “Index Array” function in order to find a spesific

element in the array:



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→ Test your program by using the Run button in the Toolbar.

[End of Task]



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Task 5: SubVIs

Create a SubVI from the Calculator created in a previous task.

Calculator.vi

Icon Editor:

This includes creating a nice icon using the “Icon Editor”:

→ Right-click in the upper right window and select “Edit Icon” in order to openthe Icon Editor.



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You also need to create input/output Connectors

Using and testing the SubVI:

We will now create a new program that uses the SubVI.

Block Diagram:

→ Create a new blank VI and open the Block Diagram.

→ Insert the SubVI by right-click and select “Select a VI” in the Functions

palette.

→ Right-click on the SubVI inputs and select “Create→Control”



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Front Panel:

The Front Panel could look like this:



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Test of SubVI Calculator.vi

→ Test your program by using the Run button in the Toolbar.

[End of Task]



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Task 6: Plotting


Plotting.vi

Front Panel:

Use the “Waveform Chart” Control:



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Block Diagram:

Random Number (0-1):

→ Use the “Random Number (0-1)” function in order to create some random

data in your plot:

Waveform Chart:

→ Insert the “Waveform Chart” inside the “While Loop”.

Wait (ms):

→ Update the chart every second by using the “Wait (ms)”:


[End of Task]




Faculty of Technology

Kjølnes Ring 56

N-3914 Porsgrunn, Norway

www.hit.no

Hans-Petter Halvorsen, M.Sc.


Department of Electrical Engineering, Information Technology and

Cybernetics

Phone: +47 3557 5158

E-mail: [email protected]

Blog: http://home.hit.no/~hansha/

Room: B-237a

http://www.hit.no/

http://www.hit.no/

mailto:[email protected]



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