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首页编程打造智能家居:实用指南与创新灵感
编程打造智能家居:实用指南与创新灵感
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更新于2024-07-17
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"《编程你的家》是一本旨在激发读者对家庭自动化广阔潜力的兴趣,并培养他们在这一领域自信创作的指南。作者迈克·赖利以其丰富的技术背景为基石,将复杂的项目分解成易于理解和实践的部分,使读者能够轻松实现智能家居的梦想,同时保持成本效益。 书中亮点之一是“Web-Enabled Light Switch”项目,它不仅提供了家庭生活的便利性和安全保障,还让读者深入了解了RS-232通信技术。通过家中灯光远程控制,如从舒适的椅子上操控,这个项目展示了无线技术在家居中的实际应用,对传统家居设备的智能化改造具有深远影响。 另一个引人入胜的案例是“Tweeting Bird Feeder”,该项目展示了如何利用射频通信技术,除了Wi-Fi之外,还可以用于诸如鸟类喂食器等家庭设备,有助于保护面临食物和栖息地危机的鸟类物种。这本书对于科技爱好者来说,无论是初学者还是高级玩家,都能从中获得宝贵的灵感和知识。 《编程你的家》得到了业内专家的高度评价。咨询顾问迈克尔· Bengtson称赞它是一本难得的宝典,信息科技专家鲍勃·Cochran肯定了作者对Arduino微控制器的精彩解读,这对于不同层次的家居自动化爱好者都具有吸引力。此外,Sven Davies,作为应用副总裁,认为这本书堪称DIY领域的杰出参考,其影响力甚至可以与软件工程师常提到的《设计模式》相提并论。 《编程你的家》不仅仅是一本技术书籍,它是一部引导读者探索和实践智能家居创新的实用手册,帮助他们打破常规,发掘潜在的创新点,提升生活质量,同时也促进了科技与生态保护的结合。对于所有对家庭自动化感兴趣的人来说,这是一份不容错过的宝贵资源。"
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personally prefer iOS devices as the platform of choice for my mobile lifestyle,
the overhead associated with writing applications for iOS is a hassle. In addi-
tion to learning Objective-C and the various frameworks as well as dealing
with the burden of memory management, deploying iOS apps requires either
a jailbroken device or the legitimate purchase of an annual membership to
Apple’s iPhone developer network. Conversely, Android’s SDK and application
deployment is free and open. Android programs can also multitask better
than iOS programs. Of course, these two advantages also bring on greater
security and resource utilization risks. That said, I encourage readers who
prefer the mobile demos to run on non-Android devices to port the simple
client programs presented in this book to their favorite mobile OS and share
these conversions with the Programming Your Home community.
Another term that is gaining a foothold in the tech press is the “Internet of
Things.” This phrase refers to the idea that with the proliferation of network-
connected microcontrollers, Internet-based communication between such
small devices will eventually outnumber people surfing the Web. While that
may be the case for submitting data upstream, reaching such a device from
the Internet is still a hassle. Besides the technical knowledge required to set
up a dynamic DNS and securely configure port forwarding to easily reach the
device, ISPs may block outbound ports to prevent end consumers from setting
up dedicated servers on popular network ports like FTP, HTTP/S, and SMTP.
The projects in this book should work perfectly fine in a home local area
network. However, obtaining sensor data outside of this local network is a
challenge. How do you check on the status of something like a real-time
temperature reading without going through the hassles of opening and for-
warding ports on your router (not to mention the potential security risks that
entails)?
Fortunately, several companies have begun to aggressively offer platforms
accessible via simple web service APIs to help overcome these hassles. Three
of these gaining momentum are Pachube, Exosite, and Yaler.
1
Configuring
and consuming their services is a fairly straightforward process. I encourage
you to visit these sites to learn more about how to incorporate their messaging
capabilities into your own projects.
1. http://www.pachube.com, http://www.exosite.com, and http://www.yaler.org, respec-
tively.
xvi • Preface
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Code Examples and Conventions
The code in this book consists of C/C++ for Arduino, Java for Android, Ruby
for web middleware, and Python for desktop scripts. Most of the code examples
are listed in full, except when burdened by external library overhead (such
as in the case of Android and Ruby on Rails program listings). Syntax for
each of these languages is highlighted appropriately, and much of the code
is commented inline along with bullet markings to help bring attention to the
big ideas in the listings.
Highlights and sidebars are used sparingly in the book in an effort to keep
information moving at a quick yet manageable clip.
Online Resources
Visit the book’s website at http://pragprog.com/titles/mrhome, where you
can download the code for all the projects, participate in the book’s discussion
forum, ask questions, and post your own home automation ideas. Bugs, typos,
omissions, and other errors in the book can be found on the book’s errata
web page.
Other popular website resources include the popular DIY websites Makezine,
and Instructables,
2
where participants share a wide variety of home-brewed
creations with their peers.
There are also several IRC channels on freenode.net and SIG forums on Google
Groups dedicated to the subject, with many focused on singular aspects of
DIY gadget design, home automation, and hardware hacking.
3
OK, enough with the preamble. Let’s get ready to build something!
2. http://www.makezine.com and http://www.instructables.com, respectively.
3. http://groups.google.com/group/comp.home.automation/topics
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Code Examples and Conventions • xvii
Part I
Preparations
CHAPTER 1
Getting Started
Before we start wiring up hardware and tapping out code, let’s lay down the
foundation, starting with what exactly we mean by home automation, what’s
been available in the consumer space in the past, and why building our own
solutions makes sense today and in the future.
We will also review a couple of design and construction best practices that
will be put to good use when assembling the projects in this book.
We’ll start by defining what we mean by home automation. Next we’ll consider
some of the prepackaged commercial solutions on the market, and then we’ll
take a quick snapshot of some of the more popular custom automation
hardware and software projects. The chapter will conclude with some of the
tools and practices that have helped me quite a bit when building the projects
in this book as well as with other projects beyond the home automation
category.
1.1 What Is Home Automation?
So what exactly does the term home automation mean? At its most basic
level, it’s a product or service that brings some level of action or message to
the home environment, an event that was generated without the homeowner’s
direct intervention. An alarm clock is a home automation device. So is a smoke
alarm. The problem is, these stand-alone devices don’t use a standard network
communication protocol, so they can’t talk to one another the way that net-
worked computers can.
One of my earliest memories of home automation was when the Mr. Coffee
automatic drip coffee machine came out in the early 1970s. The joy this
simple kitchen appliance brought my coffee-drinking parents was genuine.
They were so pleased to know that when they woke up in the morning a
report erratum • discuss
freshly brewed pot of coffee would be waiting for them. Who would have
thought that such a simple concept as a coffee maker combined with an alarm
clock would change their world?
Now that we’re in the twenty-first century, rudimentary coffee makers are
getting a makeover by tinkerers bolting network adapters, temperature sen-
sors, and microcontrollers to make the brew at the right time and temperature
and to send a text message alert that the beverage is ready for consumption.
It’s only a matter of time before manufacturers incorporate inexpensive elec-
tronics into their appliances that do what tinkerers have been doing with
their home electronics for years. But a standard communication protocol
among such devices remains elusive. Nevertheless, efforts are afoot by a
number of home automation vendors to address that problem.
1.2 Commercial Solutions
The number of attempts to standardize home automation communication
protocols has been ongoing nearly as long as Mr. Coffee has been in existence.
One of the earliest major players was X10, a company that still offers basic
and relatively inexpensive home automation solutions today. X10 takes
advantage of existing electrical wiring in the home. It uses a simple pulse
code protocol to transmit messages from the X10 base station or from a
computer connected to an X10 communication interface. But problems with
signal degradation, checksums, and return acknowledgments of messages,
as well as X10’s bulky hardware and its focus on controlling electrical current
via on/off relay switches, have constrained X10’s broader appeal.
Other residentially oriented attempts at standards, such as CEBus and
Insteon, have been made, but none have attained broad adoption in the home.
This is partly due to the chicken-and-egg problem of having appliance and
home electronics manufacturers create devices with these interfaces and
protocols designed into their products.
Most recently, Google has placed its bet on the Android operating system
being embedded into smart devices throughout the home. Time will tell if
Google will succeed where others have failed, but history is betting against
it.
Rather than wait another twenty years for a winning standard to emerge,
embedded computing devices exist today that employ standard TCP/IP to
communicate with other computers. This hardware continues to drop to
fractions of the prices they cost only a few years ago. So while the market
continues to further commoditize these components, the time is now for
4 • Chapter 1. Getting Started
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