Emily Gertz - Environmental Monitoring with Arduino: Building Simple Devices to Collect Data About the World Around Us
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After the devastating tsunami in 2011, DYIers in Japan built their own devices to detect radiation levels, then posted their finding on the Internet. Right now, thousands of people worldwide are tracking environmental conditions with monitoring devices theyve built themselves. You can do it too!
This inspiring guide shows you how to use Arduino to create gadgets for measuring noise, weather, electromagnetic interference (EMI), water purity, and more. Youll also learn how to collect and share your own data, and you can experiment by creating your own variations of the gadgets covered in the book. If youre new to DIY electronics, the first chapter offers a primer on electronic circuits and Arduino programming.
- Use a special microphone and amplifier to build a reliable noise monitor
- Create a gadget to detect energy vampires: devices that use electricity when theyre off
- Examine water purity with a water conductivity device
- Measure weather basics such as temperature, humidity, and dew point
- Build your own Geiger counter to gauge background radiation
- Extend Arduino with an Ethernet shieldand put your data on the Internet
- Share your weather and radiation data online through Pachube
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Copyright 2012 Emily Gertz and Patrick Di Justo, Patrick DiJusto and Emily Gertz
OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (.
Nutshell Handbook, the Nutshell Handbook logo, and the OReilly logo are registered trademarks of OReilly Media, Inc. Environmental Monitoring with Arduino and related trade dress are trademarks of OReilly Media, Inc.
Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks. Where those designations appear in this book, and OReilly Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps.
Important Message to Our Readers: The technologies discussed in this publication, the limitations on these technologies that technology and content owners seek to impose, and the laws actually limiting the use of these technologies are constantly changing. Thus, some of the projects described in this publication may not work, may cause unintended harm to systems on which they are used, or may not be consistent with current laws or applicable user agreements.
Your safety is your own responsibility, including proper use of equipment and safety gear, and determining whether you have adequate skill and experience. Electricity and other resources used for these projects are dangerous unless used properly and with adequate precautions, including safety gear. These projects are not intended for use by children. While every precaution has been taken in the preparation of this book, OReilly Media, Inc., and the authors assume no responsibility for errors or omissions. Use of the instructions and suggestions in Environmental Monitoring with Arduino is at your own risk. OReilly Media, Inc., and the authors disclaim all responsibility for any resulting damage, injury, or expense. It is your responsibility to make sure that your activities comply with applicable laws, including copyright.
To all our nieces and nephews, who we hope will make a more understandable world.
This book is all about making the invisible visible.
Each project introduces a particular environmental condition, and then teaches you step by step how to build a small, inexpensive electronic device that can monitor that condition, and communicate back what it finds.
When you start monitoring the environment, something happens: You start to understand the world around you in a new way.
Build a water quality tester, and a beautiful, clear-running stream may become a beautiful clear stream with a high particulate count (see ).
Build a gadget to measure temperature and humidity, and youll see for yourself that high noon is not the hottest part of the day; that actually comes around 3 p.m. (see ).
Build an electromagnetic field detector, and youll discover even a quiet room is buzzing with unseen, unheard electrical vibrations (see ).
We usually turn environmental monitoring over to the scientific experts at government agencies, universities, and corporations. They come armed with complicated and expensive equipment as well as specialized educations, and occasionally their own institutional agendas.
Since the natural environment is complex, even more so for all the stuff we human beings and our activities have added to the mix, this sort of expertise has an important role in our lives and in our communities. Scientific analysis and expertise are key to creating effective regulations that control the impacts human activities have on the environment and our health.
Monitoring the environment for ourselves, however, pulls the curtain back on what all those experts are doing. Understanding brings knowledge, and with knowledge comes the power to make decisions that can change our lives for the betterfrom lowering the electric bill, to holding polluters accountable, to helping scientists study the changing climate.
We suggest that you build the projects that follow in the given order, since they progress from easier to more complex.
If you already have some experience with Arduino, and want more challenges in making and using these gadgets, look for the Things to Try section at the end of each project chapter. We make suggestions for changing the build or the programming that will exercise your skills. We hope youll come up with your own ideas, too, and tell us about them.
One straightforward way to increase each projects difficulty, once you have built and tested a gadget, is to rebuild it in a more permanent way by soldering the components together. We also offer a few general suggestions for creating enclosureshandy and rugged cases for your gadgetsat the end of this book. You can make enclosures as simply or elaborately as you choose.
Finally: We do our best to describe how to build each gadget as clearly as possible. But as its almost inevitable that even a simple project will frustrate you now and then, here are some tips to keep things fun and interesting:
When it comes to coding, this is our mantra:
- Save: Save your code frequently as you work on it.
- Back up: Always back up your code to at least one location other than your hard drive, such as a peripheral drive, memory card, or flash drive.
- Document: As you write programming code, include comments (more on this in ) that explain what the code does; when you look at your code several days later, you might not remember. As you build a gadget, take notes about what you discover, so that you can refer to them later.
Do these three simple things consistently, and when your computer crashes, your laptop falls out of your bag and onto the concrete, or your cat walks across the keyboard, you will be calm in the knowledge that you always have a copy of your work safely stored somewhere else.
Change only one thing at a timeIf you decide to make any changes to the code or the design of these gadgets (and we heartily encourage you to do so), we suggest that you change only one thing at a time, and test it before making another change.
This is important because your change may cause the gadget to stop working. If youve made only one change, it will be easy to undo it and return to a working version of the gadget. This allows you to move ahead with confidence, because you know that any glitch is easy to fix.
Mash it upWeve done our best to design these gadgets in a modular fashion, so that with only a little tweaking, you can swap the the input and output components between them. Want to modify the temperature gadget to output to Pachube rather than a display? Go for it! The hardware should be easy to modify, and changing the code will usually be a simple matter of cutting and pasting from one gadgets code to the next.
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