336540
Design of Bio-Medical Virtual
Instrumentation
Tutorial 1
Course information
Dr. Eugene Konyukhov: eugene@bm.technion.ac.il , BM room 342 ,
Tel: 054-7891895
Tal Gilboa: talh@tx.technion.ac.il , Emerson building 6th floor, Tel: 5103
Shir Paluch: shirp@tx.technion.ac.il , BM room 330, Tel: 4127
Reception hours: By appointment
Grading:
• 20% Homework (~5 HW assignments)
• 80% Project
Outline
Navigating LabVIEW
– Front panel window
– Controls, Indicators and constants
– Block diagram window
– Data flow
LabVIEW
Laboratory Virtual Instrumentation Engineering Workbench
LabVIEW – graphical programming environment which
can be used to create applications with professional
user interfaces
• LabVIEW programs are called VIs (virtual instruments)
• LabVIEW VIs contain two main components:
1. The front panel window
2. The block diagram window
Front Panel
• The front panel window is the user interface for the VI
Run the VI
If the arrow is broken it mean that we have an error in our program
Run continuously
Stop
Pause
Design buttons
Controls Indicators and Constants
Controls:
• Controls are the interactive input terminals of the VI. They stimulate
input devices and supply data to the block diagram.
• Controls are: knobs, push buttons etc.
Indicators:
• Indicators are the interactive output terminals of the VI. They display
data the block diagram acquires or generates.
• Indicators are graphs, LEDs etc.
Constants - values that the user doesn’t need to change or access.
Controls palette
Use the Controls palette to place controls
and indicators on the front panel
View » Controls Palette or right-click the
front panel workspace to display the
Controls palette
Controls and Indicators
Every control or indicator has a data type associated with is:
• Numeric Controls and Indicators – represent numbers of various types
• Boolean Controls and Indicators- represent data that has only two
possible states
• String Controls and Indicators – sequence of ASCII characters
Block Diagram
• The Block Diagram window contains the graphical source code
Terminal
Constant
Functions palette
Use the Functions palette to build the block
diagram
View » Functions Palette or right-click the
block diagram workspace to display the
Functions palette
To display the Context Help window
select Help » Show Context Help
or press the <Ctrl-H> keys
Exercise 1
• Create a VI which gets the height and base of a
triangle from the user, computes the area of the
triangle and presents it
Exercise 2
Create a VI which:
• Gets two numbers from the user
• Sums, divides and multiplies them
• subtracts 1 from one of the numbers
• Presents all the results
Data flow
• LabVIEW follows a dataflow model for running VIs
• A block diagram node executes when it receives all required inputs
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•
•
•
Which function executes first: Add or subtract?
Which function executes first: Random number, subtract or add?
Which function executes first: Random number, divide or add?
Which function executes last: Random number, subtract or add?