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Alasdair Allan - Basic Sensors in IOS: Programming the Accelerometer, Gyroscope, and Magnetometer

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Basic Sensors in IOS: Programming the Accelerometer, Gyroscope, and Magnetometer: summary, description and annotation

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What really sets the iPhone apart from laptops and PCs is its use of onboard sensors, including those that are location-enabled. This concise book takes experienced iPhone and Mac developers on a detailed tour of iPhone and iPad hardware by explaining how these sensors work, and what theyre capable of doing.With this book, youll build sample applications for each sensor, and learn hands-on how to take advantage of the data each sensor produces. Youll gain valuable experience that you can immediately put to work inside your own iOS applications for the iPhone, iPod touch, and iPad. This book helps you focus on:Camera: learn how to take pictures and video, create video thumbnails, customize video, and save media to the photo album Audio: use the media picker controller and access the iPod music library in your own application, and enable your app to record and play sampled audio Accelerometer: write an application that uses this sensor to determine device orientation Magnetometer: learn how this sensor verifies compass headings Core Motion: use this framework to receive motion data from both the accelerometer and the vibrational gyroscopeThis short book is part of a collection that will, along with new material, be compiled into a larger book, iOS Sensor Programming. The other books in this collection are Augmented Reality in iOS, Geolocation in iOS, and iOS Sensor Apps with Arduino.

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Basic Sensors in iOS
Alasdair Allan
Editor
Brian Jepson

Copyright 2011 Alasdair Allan

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. Basic Sensors in iOS , the image of a Malay fox-bat, 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.

While every precaution has been taken in the preparation of this book, the publisher and author assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein.

OReilly Media Preface Over the last few years the new generation of smart - photo 1

O'Reilly Media

Preface

Over the last few years the new generation of smart phones, such as Apples iPhone, has finally started to live up to their name and have become the primary interface device for geographically tagged data. However not only do these devices know where they are, they can tell you how theyre being held, they are sufficiently powerful to overlay data layers on the camera view, and record and interpret audio data, and they can do all this in real time. These are not just smart phones, these are computers that just happen to be able to make phone calls.

This book should provide a solid introduction to using the hardware features in the iPhone, iPod touch, and iPad.

Who Should Read This Book?

This book provides an introduction to the hot topic of location-enabled sensors on the iPhone. If you are a programmer who has had some experience with the iPhone before, this book will help you push your knowledge further. If you are an experienced Mac programmer, already familiar with Objective-C as a language, this book will give you an introduction to the hardware specific parts of iPhone programming.

What You Should Already Know?

The book assumes some previous experience with the Objective-C language. Additionally some familiarity with the iPhone platform would be helpful. If youre new to the iPhone platform you may be interested in Learning iPhone Programming , also by Alasdair Allan (OReilly).

What Will You Learn?

This book will guide you through guide you through developing applications for the iPhone platform that make use of the onboard sensors: the three-axis accelerometer, the magnetometer (digital compass), the gyroscope, the camera and the global positioning system

Whats In This Book?

This chapter summarizes the available sensors on the iPhone and iPad platforms and how they have, or could be, used in applications. It talks about the differences between the hardware platforms.

Walkthrough of how to use the iPhones camera for still and video. How to create video thumbnails and customise video.

Walkthrough of how to playback iPod media, as well as how to play and record audio on your device.

Walkthrough of how to use the accelerometer, discussion of what is implied with respect to the orientation of the device by the raw readings.

Walkthrough of how to use the magnetometer, discussion of combining the magnetometer and accelerometer to get the yaw, pitch and roll of the device.

This paragraph discusses the new Core Motion framework; this new framework allows your application to receive motion data from both the accelerometer and (on the latest generation of devices) the gyroscope.

Provides a collection of pointers to more advanced material on the topics we covered in the book, and material covering some of those topics that we didnt manage to talk about in this book.

Conventions Used in This Book

The following typographical conventions are used in this book:

Italic

Indicates new terms, URLs, email addresses, filenames, and file extensions.

Constant width

Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.

Constant width bold

Shows commands or other text that should be typed literally by the user.

Constant width italic

Shows text that should be replaced with user-supplied values or by values determined by context.

Note

This icon signifies a tip, suggestion, or general note.

Warning

This icon signifies a warning or caution.

Using Code Examples

This book is here to help you get your job done. In general, you may use the code in this book in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example: Basic Sensors in iOS , by Alasdair Allan. Copyright 2011 OReilly Media, Inc., 978-1-4493-0846-9.

If you feel your use of code examples falls outside fair use or the permission given here, feel free to contact us at .

Warning

A lot of the examples wont work completely in the simulator, so youll need to deploy them to your device to test the code.

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