806 ENE Laboratory Feasibility Studies for Environmental Remediation Introduction to LabVIEW
By Ahsan Munir Instructor: Dr. Syed Hashsham
Introduction to Labview
Product of National Instruments (NI) Software for Virtual Instrumentation Data Acquisition (DAQ) Graphical Programming Data Storage and Analysis for wide Range of Applications
Features of LabVIEW
Design Signal and Image Processing Embedded System Programming (PC, DSP, FPGA, Microcontroller) Simulation and Prototyping And more... Control Automatic Controls and Dynamic Systems Mechatronics and Robotics And more... Measurements Circuits and Electronics Measurements and Instrumentation And more...
Things to do.....
PHYSICAL SYSTEM
ACQUIRE
ANALYSE
DISPLAY
Data Acquisition (DAQ)
"Data acquisition is the process of gathering or generating information in an automated fashion from analog and digital measurement sources such as sensors and devices under test." Video Tutorial Build a PC-Based Data Acquisition System in 10 Minutes http://zone.ni.com/wv/app/doc/p/id/wv-207
( from National Instruments Corporation)
Introduction to Labview
Creating your first Virtual Instrument A simple Input/Output VI
Start Labview Create a Blank VI
You should see the Front Panel. Close any open palettes or menus to simplify the look. Use the View menu to display the Tools Palette. Notice it is set to automatically choose the correct tool. You can switch between the Front Panel and the Block Diagram by using the Ctrl-E command. You can also use the Window menu.
Right-click anywhere in the Front Panel to bring up the Controls Palette. Hover over the Numeric Controls to see what is available. Choose a simple Numeric Control with a left-click and place it on the Front Panel with another left-click.
The control icon (an input) should show up on the Front Panel
It's corresponding icon will show up on the Block Diagram.
This is what a User will see to operate the program.
Change the name of the Numeric Control to "Input 1" Use left-clicks to select and change the name. Notice that the correct tool is chosen for you as you change the name. The name will change on both the Front Panel and the Block Diagram.
Choose the wrong Control
You will now make your first mistake in a Labview program. This is so that you can learn how to fix a mistake. Go back to the Front Panel and create another Numeric Control You are smart enough to know that you may want a Numeric Indicator (an output) to pair up with the Control (the input). This is correct. But we will make the mistake and then learn a way to quickly fix the mistake which is easy to make.
Right-click on the Front Panel to bring up the Controls Palette. Hover over the Numeric Controls to see what is available. Choose a simple Numeric Control with a left-click and place it on the Front Panel with another left-click. The second Numeric Control should show up both places.
Go to the Block Diagram Try to wire the Input 1 to the new Numeric Control. You do not have to choose the wire tool. It should be done automatically. You will see a broken wire because it can not be done.
Right-click on the bad Control you just created and Change to Indicator The wiring should work now. Notice the Control is thick the and Indicator is thin. Also notice the wire comes out of the right and into the left.
Change the name of the Indicator to Output1 Add some more Indicators to the Front Panel and wire them up in the Block Diagram. Now do it without mistakes. Choose an Indicator. You should only have 1 Control. Input 1 should be putting its value into all the other Outputs. No broken wires means you are ready to run.
Type a number into the Input. Or use the arrows on the input to select a value. Hit the Run button on the Control Panel
For a more meaningful Labview experience. Hit the Run Continuously button. You should be able to figure out how to stop it. Change the value of the input and watch the output. Go to the Block Diagram and hit the Highlight Execution button. This helps in debugging programs to show the data flow through the diagram. Turn this off to speed up program execution.
Fixing a small problem on the Indicators can be done while the program is running.
Double left-click to select and change values of indicators.
If you don't like the horizontal slide.
Stop the Program. Right-click on the slide. Replace with the item you chose.
Replace the Input Control with a Knob. Right-click gives many options. Take some time to explore the format and precision options to make it look nice. Showing the digital display is a nice option. It gives two ways to input the value for the Control.
Adding Two Inputs
On the Front Panel, create two new numeric controls (inputs) and one new numeric indicator (an output) You will be adding the two inputs together and putting the result into the output. You will be creating a $2500 adding machine.
Create these three simple items and rename them.
Find the new items on the Block Diagram. They should be named correctly.
Right-click within the Block Diagram to bring up the Functions Palette. Hover above the Numeric structure to bring up the addition Function Block.
Left-click to choose the addition fun...