Smart Sensors and
Applications
Student Guide
VERSION 1.0
WARRANTY
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purchase price. Before returning the product to Parallax, call for a Return Merchandise Authorization (RMA)
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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
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guarantee is void if the product has been altered or damaged. See the Warranty section above for instructions on
returning a product to Parallax.
COPYRIGHTS AND TRADEMARKS
This documentation is copyright 2006 by Parallax Inc. By downloading or obtaining a printed copy of this
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permitted and may represent a violation of Parallax copyrights, legally punishable according to Federal copyright or
intellectual property laws. Any duplication of this documentation for commercial uses is expressly prohibited by
Parallax Inc. Duplication for educational use is permitted, subject to the following conditions: the text, or any portion
thereof, may not be duplicated for commercial use; it may be duplicated only for educational purposes when used
solely in conjunction with Parallax products, and the user may recover from the student only the cost of duplication.
This text is available in printed format from Parallax Inc. Because we print the text in volume, the consumer price is
often less than typical retail duplication charges.
BASIC Stamp, Stamps in Class, Board of Education, Boe-Bot SumoBot, SX-Key and Toddler are registered
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respective holders.
ISBN 1-928982-39-5
DISCLAIMER OF LIABILITY
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how life-threatening it may be.
3
RD
PRINTING
We maintain active web-based discussion forums for people interested in Parallax products. These lists are accessible
from www.parallax.com:
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Propeller chip – This list is specifically for our customers using Propeller chips and products.
BASIC Stamp – This list is widely utilized by engineers, hobbyists and students who share their
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Stamps in Class
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SX Microcontrollers and SX-Key – Discussion of programming the SX microcontroller with
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Javelin Stamp – Discussion of application and design using the Javelin Stamp, a Parallax module
that is programmed using a subset of Sun Microsystems’ Java
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ERRATA
While great effort is made to assure the accuracy of our texts, errors may still exist. If you find an error, please let us
know by sending an email to editor@parallax.com. We continually strive to improve all of our educational materials
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Table of Contents ·
Page i
Table of Contents
Preface........................................................................................................................iii
Introduction and Author's Note ...................................................................................... iii
Overview......................................................................................................................... v
Before you Start.............................................................................................................. v
The Stamps In Class Educational Series ...................................................................... vi
Foreign Translations ..................................................................................................... vii
Special Contributors ..................................................................................................... vii
Chapter 1: The Parallax Serial LCD Display ............................................................1
LCDs in Products............................................................................................................2
The Parallax Serial LCD - Your Mobile Debug Terminal ................................................2
Activity #1: Connecting and Testing the LCD .................................................................4
Activity #2: Displaying Simple Messages .......................................................................8
Activity #3: Timer Application........................................................................................17
Activity #4: Custom Characters and LCD Animation ....................................................19
Activity #5: Scrolling Text Across the Display...............................................................25
Summary ......................................................................................................................34
Chapter 2: The Ping))) Ultrasonic Distance Sensor ..............................................41
How Does the Ping))) Sensor Work?............................................................................41
Activity #1: Measuring Echo Time ................................................................................42
Activity #2: Centimeter Measurements .........................................................................46
Activity #3: Inch Measurements....................................................................................49
Activity #4: Mobile Measurements ................................................................................51
Activity #5: Temperature's Effect on the Speed of Sound ............................................58
Summary ......................................................................................................................61
Chapter 3: The Memsic Dual-Axis Accelerometer ................................................65
The MX2125 Accelerometer – How it Works................................................................67
Activity #1: Connecting and Tilt-Testing the MX2125 ...................................................68
Activity #2: Mobile Measurements ................................................................................71
Activity #3: Scaling Down and Offsetting Input Values .................................................76
Activity #4: Scaling to 1/100 g.......................................................................................83
Activity #5: Measuring 360° Vertical Rotation...............................................................85
Activity #6: Measure Tilt From the Horizontal ...............................................................98
Summary ....................................................................................................................112
Chapter 4: The Hitachi HM55B Compass Module ...............................................119
Interpreting the Compass Measurements...................................................................119
Activity #1: Connecting and Testing the Compass Module ........................................120
Activity #2: Compass Module Calibration ...................................................................128
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