Book Image

Data Acquisition using LabVIEW

By : Behzad Ehsani
Book Image

Data Acquisition using LabVIEW

By: Behzad Ehsani

Overview of this book

NI LabVIEW's intuitive graphical interface eliminates the steep learning curve associated with text-based languages such as C or C++. LabVIEW is a proven and powerful integrated development environment to interact with measurement and control hardware, analyze data, publish results, and distribute systems. This hands-on tutorial guide helps you harness the power of LabVIEW for data acquisition. This book begins with a quick introduction to LabVIEW, running through the fundamentals of communication and data collection. Then get to grips with the auto-code generation feature of LabVIEW using its GUI interface. You will learn how to use NI-DAQmax Data acquisition VIs, showing how LabVIEW can be used to appropriate a true physical phenomenon (such as temperature, light, and so on) and convert it to an appropriate data type that can be manipulated and analyzed with a computer. You will also learn how to create Distribution Kit for LabVIEW, acquainting yourself with various debugging techniques offered by LabVIEW to help you in situations where bugs are not letting you run your programs as intended. By the end of the book, you will have a clear idea how to build your own data acquisition system independently and much more.

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Data Acquisition using LabVIEW
Behzad Ehsani
Dec, 2016 | 150 pages
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Table of Contents (18 chapters)
Data Acquisition Using LabVIEW
Data Acquisition Using LabVIEW
Credits
Credits
About the Author
About the Author
Acknowledgments
Acknowledgments
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
LabVIEW Basics
LabVIEW Basics
Introduction to LabVIEW
Installing LabVIEW
A basic LabVIEW VI
LabVIEW menu bar icons
Example 1 - counter with a gauge
Creating a project is a must
Chapter highlights
Summary
2
Most Common Communication Buses
Most Common Communication Buses
Wired connections and drivers
Serial communication
GPIB
SCPI commands sets
Arduino for LabVIEW driver installation
Arduino photo sensor board
Summary
3
Using the DAQ Assistant to Automatically Generate LabVIEW Code
Using the DAQ Assistant to Automatically Generate LabVIEW Code
Capturing a triangular signal
Devices required
Capturing triangular wave VI
Summary
4
DAQ Programming Using LabVIEW
DAQ Programming Using LabVIEW
Definition of data acquisition
Capture signal generator waveforms
Staircase signal (USB DAQ version)
Staircase signal (Oscilloscope version)
Oscilloscope functions in LabVIEW function pallets
Stepping through voltages
Create serial Read-Write sub VI
Power supply voltage steps
Verify Data Acquired
Power Supply Voltage Steps: Revision 1
Summary
5
Debugging Techniques
Debugging Techniques
Error conditions
Debugging - broken arrow
Debugging - highlight execution
Debugging - Set Breakpoint
Debugging - Probe, Custom Probe
Summary
6
Real-World DAQ Programming Techniques
Real-World DAQ Programming Techniques
Using event manager
Installing LINX
Acquiring distance measurements using Parallax USR with an Arduino
Duty cycle and PWM
Simultaneous data acquisition - NI DAQ and the Arduino Uno
Summary
7
Real-Time Issues
Real-Time Issues
Resolving upgradation issues
NI's native instruments
8
DAQ at a Distance - Network and Distributed Systems
DAQ at a Distance - Network and Distributed Systems
Verifying the computer's connection
A distributed test application using GPIB-ENET
Summary
9
Alternate Software for DAQ
Alternate Software for DAQ
Industry direction
10
Non-National Instrument Devices DAQ
Non-National Instrument Devices DAQ
Safety
There are two major parts to any power supply
A more correct name
Why such an introduction?
The simplest test
MB-102 MB102 Solderless Breadboard, power supply, and jumper cable
Summary
11
LabVIEW and Simple Microcontrollers
LabVIEW and Simple Microcontrollers
DAQ devices versus microcontrollers
Using the Arduino as a DAQ with LabVIEW
Installing the Arduino firmware

Debugging - broken arrow

As mentioned previously, when a VI is "seriously!" broken, it does not run and a broken arrow is displayed. Since the error is immediately recognized by LabVIEW, usually in such particular cases, the fix is probably simple (unless a major design error is recognized). A more difficult situation maybe where there are no obvious errors, but the VI does not do what we intend it to do. We will now take a closer look at a version of a VI we used in Chapter 4, DAQ Programming Using LabVIEW:

When we run the preceding VI several times, we will notice a couple of issues with the VI. Note that a displayed array may be extended horizontally or vertically:

  • The array gets longer and longer and new values are appended to the end of the results from the previous run

  • There are blank array elements between the array entries (this was an error with the logic of the VI and we fixed it by adding a check for blank array elements)

To fix the issue, we know that we need to initialize the...

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