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27340: Descriptionkit industrial contrl parts only; CategoryModule/solution; File Size6MB，266 Pages; ManufacturerParallax Inc.; Websitehttps://www.parallax.com/

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27340 Overview

kit industrial contrl parts only

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Industrial Control

Student Guide

Version 1.1

Note regarding the accuracy of this text:

Many efforts were taken to ensure the accuracy of this text and the

experiments, but the potential for errors still exists. If you find

errors or any subject requiring additional clarification, please report

this to stampsinclass@parallaxinc.com so we can continue to

improve the quality of our documentation.

Warranty

Parallax warrants its products against defects in materials and workmanship for a period of 90 days. If you discover a defect, Parallax

will, at its option, repair, replace, or refund the purchase price. Simply call for a Return Merchandise Authorization (RMA) number,

write the number on the outside of the box and send it back to Parallax. Please include your name, telephone number, shipping

address, and a description of the problem. We will return your product, or its replacement, using the same shipping method used to

ship the product to Parallax.

14-Day Money Back Guarantee

If, within 14 days of having received your product, you find that it does not suit your needs, you may return it for a full refund. Parallax

will refund the purchase price of the product, excluding shipping / handling costs. This does not apply if the product has been altered

or damaged.

Copyrights and Trademarks

name BASIC Stamp on your web page or in printed material, you must state: "BASIC Stamp is a registered trademark of Parallax, Inc."

Other brand and product names are trademarks or registered trademarks of their respective holders.

Disclaimer of Liability

Parallax, Inc. is not responsible for special, incidental, or consequential damages resulting from any breach of warranty, or under any

legal theory, including lost profits, downtime, goodwill, damage to or replacement of equipment or property, and any costs or

recovering, reprogramming, or reproducing any data stored in or used with Parallax products. Parallax is also not responsible for any

personal damage, including that to life and health, resulting from use of any of our products. You take full responsibility for your BASIC

Stamp application, no matter how life threatening it may be.

Internet Access

We maintain Internet systems for your use. These may be used to obtain software, communicate with members of Parallax, and

communicate with other customers. Access information is shown below:

E-mail:

Web:

stampsinclass@parallaxinc.com

http://www.parallaxinc.com and http://www.stampsinclass.com

Internet BASIC Stamp Discussion List

We maintain two e-mail discussion lists for people interested in BASIC Stamps (subscribe at

http://www.parallaxinc.com

under the

technical support button). The BASIC Stamp list server includes engineers, hobbyists, and enthusiasts. The list works like this: lots of

people subscribe to the list, and then all questions and answers to the list are distributed to all subscribers. It’s a fun, fast, and free

way to discuss BASIC Stamp issues and get answers to technical questions. This list generates about 40 messages per day.

The Stamps in Class list is for students and educators who wish to share educational ideas. To subscribe to this list, go to

http://www.stampsinclass.com and look for the E-groups list. This list generates about five messages per day.

Contents

Table of Contents

Preface ............................................................................................................................................ iii

Preface ................................................................................................................................................................................... iii

Audience and Teacher’s Guides..........................................................................................................................................iv

Copyright and Reproduction ...............................................................................................................................................v

Experiment #1: Flowcharting and Stamp Plot Lite ............................................................................... 7

Adjusting the Temperature for a Shower Example........................................................................................................ 8

Conveyor Counting Example .............................................................................................................................................10

Exercise #1: Flowchart Design ..........................................................................................................................................14

Exercise #2: LED Blinking Circuit ......................................................................................................................................14

Exercise #3: Analog Data....................................................................................................................................................17

Exercise #4: Using Stamp Plot Lite ..................................................................................................................................20

Questions and Challenge ...................................................................................................................................................25

Experiment #2: Digital Input Signal Conditioning ............................................................................... 27

Exercise #1: Switch Basics.................................................................................................................................................32

Exercise #2: Switch Boune and Debouncing Routines .................................................................................................37

Exercise #3: Edge Triggering .............................................................................................................................................40

Exercise #4: An Electronic Switch....................................................................................................................................47

Exercise #5: Tachometer Input.........................................................................................................................................52

Questions and Challenge ...................................................................................................................................................64

Experiment #3: Digital Output Signal Conditioning ............................................................................ 71

Exercise #1: Sequential Control .......................................................................................................................................74

Exercise #2: Current Boosting the BASIC Stamp..........................................................................................................85

Questions and Challenge ...................................................................................................................................................91

Experiment #4: Continuous Process Control ..................................................................................... 97

Exercise #1: Closed Loop On-Off Control......................................................................................................................98

Exercise #2: Open-Loop vs. Closed-Loop Control .....................................................................................................113

Questions and Challenge .................................................................................................................................................125

Experiment #5: Closed-Loop Control ...............................................................................................127

Exercise #1: Establishing Closed-Loop Control ..........................................................................................................130

Exercise #2: Differential-Gap Control ..........................................................................................................................136

Questions and Challenge .................................................................................................................................................142

Experiment #6: Proportional Integral Derivative Control ..................................................................145

Exercise #1: Bias Drive .....................................................................................................................................................155

Exercise #2: Proportional Integral Control..................................................................................................................172

Exercise #3: Derivative Control......................................................................................................................................179

Questions and Challenge .................................................................................................................................................187

Page i

Contents

Experiment #7: Real-time Control and Data Logging ........................................................................ 189

Exercise #1: Real Time Control.......................................................................................................................................192

Questions and Challenge..................................................................................................................................................199

Exercise #2: Interval Timing.............................................................................................................................................199

Questions and Challenges................................................................................................................................................203

Exercise #3: Data Logging ................................................................................................................................................204

Questions and Challenges................................................................................................................................................219

Appendix A: Stamp Plot Lite ........................................................................................................... 221

Appendix B: Encoder Printouts ....................................................................................................... 233

Appendix C: Potter Brumfield SSR Datasheet.................................................................................. 235

Appendix D: National Semiconductor LM34 Datasheet..................................................................... 239

Appendix E: National Semiconductor LM358 Datasheet.................................................................... 245

Appendix F: Dallas Semiconductor 1302 Datasheet.......................................................................... 251

Appendix G: Parts Listing and Sources ............................................................................................ 257

Appendix H: Commercial Incubator Challenge ................................................................................. 261

Page ii

Preface

Industrial process control is a fascinating and challenging area of electronics technology and nothing

has revolutionized this area like the microcontroller. The microcontroller has added a level of intelligence to

the evaluation of data and a level of sophistication in the response to process disturbances. Microcontrollers

are embedded as the “brains” in both manufacturing equipment and consumer electronic devices.

Process control involves applying technology to an operation that alters raw materials into a desired

product. Virtually everything that you use or consume has undergone some type of automatic process control

in its production. In a manufacturing environment, automatic process control also provides higher

productivity and better product consistency while reducing production costs.

This text is intended to introduce you to the concepts and characteristics of microcontroller-based

process control with the following experiment-based themes:

a) Writing a procedural program from a flowchart for sequential process-control.

b) Using pushbuttons, counting cycles and understanding simple I/O processes that form a

system “under control”.

c) Continuous process-control beginning with on-off control to more complex differential gap

with multiple levels of control action.

d) Proportional-integral-derivative control of a small desktop heating system.

e) Time-based control of the above and introduction to data logging.

The hardware needed in the experiments to simulate the process has been kept to a bare minimum.

While the microcontroller is the “brains” of the process, it is not the “muscle.” Actual applications require the

microcontroller to read and control a wide variety of input and output (I/O) devices. Simple breadboard

mounted pushbutton switches are used to simulate the action of mechanical and electro-mechanical switches

found in industry. Visible light emitting diodes, small fans, and low-wattage resistors simulate motor starters

and HVAC equipment. Information included in the experiments will help you understand the electrical

interfacing of “real world” I/O devices to the BASIC Stamp.

The physical nature of the elements in a system determines the most appropriate mode of control

action. The dynamics of a process include a study of the relationship of input disturbances and output action

on the measured variables. It is difficult to understand the dynamics of a process without being able to “see”

this relationship. For the authors, this defined a need to develop a graphical interface for the BASIC Stamp;

hence the creation and release of StampPlot Lite. This software allows digital and analog values to be plotted

on graphs, and time-stamped data and messages to be stored. StampPlot Lite is used throughout the

experiments, and is especially helpful as you investigate the various modes of process control. Typical screen

shots from program runs are included.

Page iii

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