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- Herausgeber: Packt Publishing
- Kategorie: Wissenschaft und neue Technologien
- Sprache: Englisch
The Internet of Things (IoT) is the network of objects such as physical things embedded with electronics, software, sensors, and connectivity, enabling data exchange. ESP8266 is a low cost WiFi microcontroller chip that has the ability to empower IoT and helps the exchange of information among various connected objects. ESP8266 consists of networkable microcontroller modules, and with this low cost chip, IoT is booming.
Kick-starting with an introduction to the ESP8266 chip, we will demonstrate how to build a simple LED using the ESP8266. You will then learn how to read, send, and monitor data from the cloud. Next, you’ll see how to control your devices remotely from anywhere in the world. Furthermore, you’ll get to know how to use the ESP8266 to interact with web services such as Twitter and Facebook. In order to make several ESP8266s interact and exchange data without the need for human intervention, you will be introduced to the concept of machine-to-machine communication.
The latter part of the book focuses more on projects, including a door lock controlled from the cloud, building a physical Bitcoin ticker, and doing wireless gardening.
With this book, you will be able to create and program Internet of Things projects using the ESP8266 WiFi chip.
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Veröffentlichungsjahr: 2016
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Table of Contents
Internet of Things with ESP8266
Internet of Things with ESP8266
Copyright © 2016 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, without the prior written permission of the publisher, except in the case of brief quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the accuracy of the information presented. However, the information contained in this book is sold without warranty, either express or implied. Neither the author(s), nor Packt Publishing, and its dealers and distributors will be held liable for any damages caused or alleged to be caused directly or indirectly by this book.
Packt Publishing has endeavored to provide trademark information about all of the companies and products mentioned in this book by the appropriate use of capitals. However, Packt Publishing cannot guarantee the accuracy of this information.
First published: July 2016
Production reference: 1260716
Published by Packt Publishing Ltd.
Livery Place
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Birmingham B3 2PB, UK.
ISBN 978-1-78646-802-4
www.packtpub.com
Credits
Author
Marco Schwartz
Reviewer
Catalin Batrinu
Commissioning Editor
Pratik Shah
Acquisition Editor
Prachi Bisht
Content Development Editor
Mamta Walkar
Technical Editor
Naveenkumar Jain
Copy Editor
Sneha Singh
Project Coordinator
Kinjal Bari
Proofreader
Safis Editing
Indexer
Pratik Shirodkar
Graphics
Kirk D'Penha
Production Coordinator
Shantanu N. Zagade
Cover Work
Shantanu N. Zagade
About the Author
Marco Schwartz is an electrical engineer, an entrepreneur, and a blogger. He has a master's degree in electrical engineering and computer science from Supélec, France, and a master's degree in micro engineering from the Ecole Polytechnique Fédérale de Lausanne (EPFL) in Switzerland.
He has more than five years of experience working in the domain of electrical engineering. Marco's interests gravitate around electronics, home automation, the Arduino and Raspberry Pi platforms, open source hardware projects, and 3D printing.
He has several websites about Arduino, including the Open Home Automation website, which is dedicated to building home automation systems using open source hardware.
Marco has written another book on home automation and Arduino, called Home Automation With Arduino: Automate Your Home Using Open-source Hardware. He has also written a book on how to build Internet of Things projects with Arduino, called Internet of Things with the Arduino Yun, Packt Publishing.
About the Reviewer
Catalin Batrinu graduated from the Politehnica University of Bucharest in Electronics, Telecommunications and Information Technology. He has been working as a software developer in telecommunications for the past 16 years.
He has worked with old protocols and the latest network protocols and technologies, so he has seen all the transformations in the telecommunication industry.
He has implemented many telecommunications protocols, from access adaptations and backbone switches to high capacity, carrier-grade switches on various hardware platforms from Wintegra and Broadcom.
Internet of Things came as a natural evolution for him and now he collaborates with different companies to construct the world of tomorrow that will make our life more comfortable and secure.
Using ESP8266, he has prototyped devices such as irrigation controllers, smart sockets, window shutters, Digital Addressable Lighting Controls, and environment controls, all of them being controlled directly from a mobile application over the cloud. Even an MQTT broker with bridging and a websockets server was developed for the ESP8266. Soon, all those devices will be part of our daily life, so we will all enjoy their functionality.
You can read his blog at http://myesp8266.blogspot.com.
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Preface
The Internet of Things (IoT) is an exciting field that proposes to have all the devices that surround us connected to the Internet and interacting with us, but also between each other. It's estimated that there will be 50 billion IoT devices in the world by the year 2020.
On the other hand, the ESP8266 chip is a small, cheap (less than $5), and powerful Wi-Fi chip that is also really easy to program. Therefore, it is just the perfect tool to build inexpensive and nice IoT projects. In this book, you are going to learn everything you need to know on how to build IoT projects using the ESP8266 Wi-Fi chip.
What this book covers
Chapter 1, Getting Started with the ESP8266, will teach all you need to know about how to choose your ESP8266 board and upload your first sketch to the chip.
Chapter 2, First Projects with the ESP8266, will explain the basics of the ESP8266 by making some real simple projects.
Chapter 3, Cloud Data Logging with the ESP8266, will dive right into the core of the topic of the book, and build a project that can log measurement data on the cloud.
Chapter 4, Control Devices from Anywhere, will reveal how to control devices from anywhere in the world using the ESP8266.
Chapter 5, Interacting With Web Services, will show how to use the ESP8266 to interact with existing web platforms such as Twitter.
Chapter 6, Machine-to-Machine Communications, will explain how to make ESP8266 chips talk to each other via the cloud, to build applications that don't require human intervention.
Chapter 7, Sending Notifications from the ESP8266, will show how to send automated notifications from the ESP8266, for example, via text message or email.
Chapter 8, Controlling a Door Lock from the Cloud, will use what we learned so far in the book to build our first application: a door lock that can be controlled remotely.
Chapter 9, Building a Physical Bitcoin Ticker, will use the ESP8266 for a fun project: making a physical display of the current price of Bitcoin.
Chapter 10, Wireless Gardening with the ESP8266, will dive into a more complex, by learning how to automate your garden with the ESP8266.
Chapter 11, Cloud-Based Home Automation System, will show how to build the essential blocks of an home automation system using the ESP8266.
Chapter 12, Cloud-Controlled ESP8266 Robot, will explain how to use the ESP8266 to control a mobile robot from anywhere in the world.
Chapter 13, Building Your Own Cloud Platform to Control ESP8266 Devices, will reveal how to build our own cloud platform for your ESP8266 projects.
What you need for this book
For this book, you will need to have the Arduino IDE, which we will use for all the projects of the book. You will learn how to install it and configure it in the first chapter of the book.
The chapters of the book were also written with a progressive complexity, so even if you don't know a lot about Arduino and/or the ESP8266 you will be able to learn as you progress through the chapters. However, previous experience in programing (especially in C++ and/or JavaScript) is recommend for this book.
Who this book is for
This book is for those who want to build powerful and inexpensive IoT projects using the ESP8266 Wi-Fi chip, including those who are new to IoT, or those who already have experience with other platforms such as Arduino.
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Chapter 1. Getting Started with the ESP8266
In this chapter, we are going to start by setting up the ESP8266 chip. We will learn how to choose the right module for your project and get all the additional hardware you need to use the chip. We will also see how to connect the ESP8266 to your computer, so you can program it using a USB cable.
Then, we are going to see how to configure and upload code to the ESP8266 chip. For that, we will be using the Arduino IDE. This makes using the ESP8266 much easier, as we will be using a well-known interface and language to configure the chip. We will also be able to use most of the already existing Arduino libraries for our projects. Let's start!
How to choose your ESP8266 module
We are first going to see how to choose the right ESP8266 module for your project. There are many modules available in the market and it is quite easy to get lost with all the choices available.
The first one that you have probably heard of is the small ESP8266 Serial Wireless Transceiver module:
This module is the most famous one, as it is really small and only costs $5. However, the number of accessible GPIO pins (input/output pins) is quite limited. It is also difficult to plug it into a standard breadboard.
If you choose this module, there are some projects in this book that you might not be able to do. For example, you won't be able to do the projects using analog sensors, as the analog input pin is not accessible.
You can find more information about this module at:
https://nurdspace.nl/images/e/e0/ESP8266_Specifications_English.pdf
But there are many other modules on the market that give you access to all the pins of the ESP8266. For example, I really like the ESP8266 Olimex module, which is also cheap (around $10):
This module can easily be mounted on a breadboard and you can easily access all the pins of the ESP8266. This is the one I will use for most of this book and therefore I also recommend that you use a similar module.
You can find additional details about this module at:
https://www.olimex.com/Products/IoT/MOD-WIFI-ESP8266-DEV/open-source-hardware
One other choice is to use a board based on the ESP-12, which is a version of the ESP8266 made to be integrated on PCBs. This version also gives you access to all the pins of the ESP8266. It is relatively easy to find breakout boards for this chip. For example, this is a board that I bought on Tindie:
You can find more information about this module on:
http://www.seeedstudio.com/wiki/images/7/7d/ESP-12E_brief_spec.pdf
You can also get your hands on the Adafruit ESP8266 breakout board, which also integrates the ESP-12:
http://www.adafruit.com/product/2471
Another solution is to use the NodeMCU development kit, which is similar to the Olimex board but also has an integrated USB-to-Serial converter, as well as an onboard power supply. It is easier to use, but was hard to find at the time this book was written. You can get more information on the NodeMCU website:
http://nodemcu.com/index_en.html
Note that with the NodeMCU module, you will have to translate the pins from the module to the pins defined in the ESP8266 Arduino IDE, which we are going to use. You will find the correspondence between pins here:
https://github.com/nodemcu/nodemcu-firmware/wiki/nodemcu_api_en#new_gpio_map
Hardware requirements
Let's now take a look at the things we need to make the ESP8266 chip work. It is usually, but incorrectly, assumed that you just need this little chip and nothing else to make it work, but we are going to see that it is not true.
First, you will need some way to program the ESP8266. You can use an Arduino board for that, but for me the really great thing about the ESP8266 is that it can function completely autonomously, using the onboard processor.
So to program the chip, I will use a USB FTDI programmer.
Note
Note that it has to be compatible with the logic level of the ESP8266 chip, so 3.3V.
I have used a module that can be switched between 3.3V and 5V:
