xmlns:epub="http://www.idpf.org/2007/ops" xmlns:m="http://www.w3.org/1998/Math/MathML" xmlns:svg="http://www.w3.org/2000/svg" xmlns:ibooks="http://vocabulary.itunes.apple.com/rdf/ibooks/vocabulary- extensions-1.0" epub:prefix="ibooks: http://vocabulary.itunes.apple.com/rdf/ibooks/vocabulary-extensions-1.0 index: http://www.index.com/" xml:lang="en" lang="en"> CONTENTS Titlepage Copyright Dedication Acknowledgments Chapter 1: Getting Started Hardware Requirements About the Raspberry Pi Zero W Installing Raspbian Connecting to a Monitor, Keyboard, and Mouse Headless: Connecting Without a Monitor Finding Your Pi on the Local Network SSHing to Your Raspberry Pi Logging In and Changing the Default Password Basic Configuration The PIXEL Desktop Introducing the Linux Command Line Installing Software Getting Help Chapter 2: Blink an LED Hardware Requirements What Is GPIO? Headers: Hooking Up to the Pi Zero W Wiring an LED on a Breadboard The Raspberry Pi Pin Layout Controlling an LED from the Command Line Blinking an LED from the Command Line Blinking an LED from a Python Program Fade an LED Python Blink Using RPi-gpio Python Fade using RPi-gpio Reading Input: A Pushbutton Other Languages, Other Interfaces Chapter 3: A Temperature Notifier and Fan Control Hardware Requirements What Is I2C? Choosing a Sensor A Temperature Tweeter Controlling a Fan or Air Conditioner Chapter 4: A Wearable News Alert Light Show Hardware Requirements DotStars NeoPixels Searching for Twitter Keywords Web Scraping in Python Making It Portable: Batteries Jumpstarting the Raspberry Pi Zero W CONTROL THE WORLD AROUND YOU WITH A $10 COMPUTER Akkana Peck Copyright © 2017 Akkana Peck. All rights reserved. Published by Maker Media, Inc., 1700 Montgomery Street, Suite 240, San Francisco, CA 94111 Maker Media books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (safaribooksonline.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or [email protected]. Publisher: Roger Stewart Editor: Patrick DiJusto Copy Editor: Elizabeth Welch, Happenstance Type-O-Rama Proofreader: Scout Festa, Happenstance Type-O-Rama Interior Designer and Compositor: Maureen Forys, Happenstance Type-O-Rama Cover Designer: Maureen Forys, Happenstance Type-O-Rama Indexer: Valerie Perry, Happenstance Type-O-Rama All the circuit and component diagrams in this book are created using Fritzing (http://fritzing.org/home). August 2017: First Edition Revision History for the First Edition 2017-08-28 First Release See oreilly.com/catalog/errata.csp?isbn=9781680453911 for release details. Make:, Maker Shed, and Maker Faire are registered trademarks of Maker Media, Inc. The Maker Media logo is a trademark of Maker Media, Inc. Jumpstarting the Raspberry Pi Zero W and related trade dress are trademarks of Maker 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 Maker Media, Inc. was aware of a trademark claim, the designations have been printed in caps or initial caps. While the publisher and the author have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the author disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights. 978-1-680-45-391-1 Safari® Books Online Safari Books Online is an on-demand digital library that delivers expert content in both book and video form from the world’s leading authors in technology and business. Technology professionals, software developers, web designers, and business and creative professionals use Safari Books Online as their primary resource for research, problem solving, learning, and certification training. Safari Books Online offers a range of plans and pricing for enterprise, government, education, and individuals. Members have access to thousands of books, training videos, and prepublication manuscripts in one fully searchable database from publishers like O’Reilly Media, Prentice Hall Professional, Addison-Wesley Professional, Microsoft Press, Sams, Que, Peachpit Press, Focal Press, Cisco Press, John Wiley & Sons, Syngress, Morgan Kaufmann, IBM Redbooks, Packt, Adobe Press, FT Press, Apress, Manning, New Syngress, Morgan Kaufmann, IBM Redbooks, Packt, Adobe Press, FT Press, Apress, Manning, New Riders, McGraw-Hill, Jones & Bartlett, Course Technology, and hundreds more. For more information about Safari Books Online, please visit us online. HOW TO CONTACT US Please address comments and questions to the publisher: Maker Media 1700 Montgomery St. Suite 240 San Francisco, CA 94111 You can send comments and questions to us by email at [email protected]. Maker Media unites, inspires, informs, and entertains a growing community of resourceful people who undertake amazing projects in their backyards, basements, and garages. Maker Media celebrates your right to tweak, hack, and bend any Technology to your will. The Maker Media audience continues to be a growing culture and community that believes in bettering ourselves, our environment, our educational system—our entire world. This is much more than an audience, it’s a worldwide movement that Maker Media is leading. We call it the Maker Movement. To learn more about Make: visit us at makezine.com. You can learn more about the company at the following websites: Maker Media: makermedia.com Maker Faire: makerfaire.com Maker Shed: makershed.com DEDICATION To Dave: husband, friend, life companion…plus editor and proofreader ACKNOWLEDGMENTS Any book represents the work of a team, not just a single author. I’d like to thank my husband Dave for his endless work reviewing each draft and helping rein in my prolixity—not to mention putting up with my angst and bellyaching when things didn’t work as expected. The staff at Maker Media—Liz, Maureen, and especially my editor, Patrick— were ever helpful and patient, putting up with my constant stream of rewrites and trying to work through the various software problems we encountered. And let’s not forget all the folks who share open source code and libraries. Without them, the Pi Zero W would never light a single LED. The wiring diagrams in the book were made with Fritzing, a terrific free tool for sharing circuit information (http://fritzing.org/). The images were edited with GIMP, the premiere open source image editing tool. The Fritzing .fzz and GIMP files are on the book’s GitHub repository, .xcf https://github.com/akkana/pi-zero-w-book. Chapter 1 Getting Started W hy choose the Raspberry Pi Zero W? It’s small. It’s cheap. It’s power efficient. It has WiFi and Bluetooth Low Energy (BLE) built in. And it has the same general-purpose input/output (GPIO) header that bigger Raspberry Pis have: the gateway to controlling all sorts of hardware. It’s easy to build gizmos that use hardware and networking in fun ways. In this book, you’ll build three projects using the Pi Zero W: Blinking LEDs An environmental monitor that can keep track of the temperature in your house, and even turn on your fan or air conditioner before you get home from work A wearable light string that monitors news feeds and websites to alert you when there’s something interesting going on You don’t need much prior experience with either hardware or programming—though knowing how to solder will help. With what you learn from these projects, you can extend the Pi’s power to hundreds of other hardware and software projects. HARDWARE REQUIREMENTS Each chapter opens with a list of hardware required to finish the project. That makes it easy to know you have what you need without running to the electronics store every half hour, or if you live in a remote area, waiting