Learning Raspberry Pi电子书

Learning Raspberry Pi

Table of Contents

Learning Raspberry Pi

Credits

About the Author

About the Reviewers

www.PacktPub.com

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Why subscribe?

Free access for Packt account holders

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Downloading the example code

Downloading the color images of this book

Errata

Piracy

Questions

1. Getting Started with Raspberry Pi

Getting to know your Raspberry Pi

Different types of operating systems

The Raspbian OS

The Arch Linux ARM OS

The RISC OS

OpenELEC and Raspbmc

Other operating systems

Command summary

Installation methods

NOOBS and BerryBoot

Installing Raspbian using RAW images

Writing an image using Windows

Writing an image using Linux

Raspbian OS interface

Expanding the filesystem

Installing Raspbian using raspbian-ua-netinst

Preparing the NetInstall on Linux

Preparing the NetInstall on Windows

Post-install configuration for Raspbian distribution

User management

Remotely accessing Raspberry Pi

The SSH remote server

Securing SSH

Transferring files

X11 Forwarding

Maintaining remote session using screen

The reverse SSH

Virtual display using VNC

Share the keyboard and mouse using Synergy

Installing a web server

Adding PHP support

Installing WordPress

Summary

2. Developing Web Applications

Getting started with HTML, JavaScript, and jQuery

Adding page content with HTML

Customizing the visual appearance

Adding interactivity with JavaScript

Simplifying scripts with jQuery

An introduction to Python

Syntax

Data types

Decorators

Modules

Flask

Creating an Internet radio station

Creating the user interface

Writing the backend

Connecting the user interface to the backend

Setting up MPD

Deploying Flask applications

Summary

3. Introduction to Electronics

Understanding the physics behind electronics

Charge, voltage, current, and resistance

Basic laws of electronics

Ohm's law

Kirchhoff's law

Kirchhoff's Current Law (KCL)

Kirchhoff's Voltage Law (KVL)

Electronics components

Resistors

Diodes

Switches

Integrated circuits

Sensors

LCD

Wire

Breadboard

Raspberry Pi electronics

WiringPi

Developing a digital clock

Setting up Raspberry Pi

Understanding HD44780-based LCD

Connecting LCD pins and Raspberry Pi GPIO pins

Scripting

The __init__ function

The clear function

The cmd function

The message function

Developing an e-mail notifier

Connecting LCD pins and Raspberry Pi GPIO pins

Scripting

Developing an alarm clock

Connecting LCD pins, Raspberry Pi GPIO pins, and a speaker

Scripting

Summary

4. Getting into Robotics

Introduction to robotics

More electronic components

Introduction to motors

Introduction to multimeter

Robotic base

Level converter

Motor driver IC

H-Bridge

The Raspberry Pi camera

Setting up the camera

Usage of modules

Taking a picture

Recording a video

An Ultrasonic sensor

The Raspberry Pi battery

The Raspberry Pi Wi-Fi module

Developing a remote-controlled robot with live feed and live distance to the nearest wall

Calculating distance using an ultrasonic sensor

Setting up Raspberry Pi

Connecting ultrasonic sensors pins and Raspberry Pi pins

Scripting

Displaying live feed from the Raspberry Pi camera module

Setting up Raspberry Pi

Connecting the Raspberry Pi and Raspberry Pi camera module

Scripting

Developing a remote-controlled robot using Raspberry Pi

Setting up Raspberry Pi

Connecting Raspberry Pi pins and robot

Scripting

Creating a user interface for controlling the robot

Controlling the movement of the robot

Initialization

Robot movement

Forward

Others

Server files that can control the Raspberry Pi GPIO

Merging everything

Connection

Scripting

Updating the user interface

Updating server-related files

Summary

5. Introduction to Image Processing

What is image processing?

Images and types of images

The grayscale image

Color/RGB

Image formats

Applications of image processing

The Raspberry Pi camera module

The image processing library

Introduction to OpenCV

Installation

The first approach

The second approach

A quick start to image processing

Reading and opening an image

Saving the image in other formats

Saving the image as a grayscale image

Pixel-related operation on the image

Accessing and modifying pixel values

Accessing image properties

Arithmetic operations on the image

Image addition

Image blending

Reading and opening a video

Creating time-lapse videos with the Raspberry Pi camera

Taking time-lapse pictures

Merging images into a video

Developing a Twitter-controlled Raspberry Pi camera

Setting up

Setting up Raspberry Pi

Getting Twitter Access keys

Scripting

Summary

6. Image Processing Algorithms

Important image processing operations

The image smoothing filter

Averaging

Gaussian filtering

Median filtering

Bilateral filtering

Morphological operations

Erosion

Dilation

Opening

Closing

Core algorithms

Edge detection

Background subtraction

BackgroundSubtractorMOG

BackgroundSubtractorMOG2

Machine learning

Object detection algorithm

Face detection

Eye detection

Projects

The track object position

OpenRelief

Capabilities

Technical specifications

Twitter-enabled surveillance systems

Summary

7. Troubleshooting, Tips/Tricks, and Resources for Advanced Users

Troubleshooting

Power/booting/installation

The LED status and their interpretation

The red Power LED does not turn ON, nothing gets displayed on screen

The red power LED is blinking

The red power LED is ON, the green LED does not flash, and nothing gets displayed on screen

The green LED blinks in a specific pattern

A colored splash screen stays forever

Kernel panic on boot

Raspberry Pi shuts down after booting up

Inputs

USB webcam

Networking

Sound

The Raspberry Pi camera

RaspiStill does not work, no image is taken

Display

Firmware updates

Manual disk resize

Tips and tricks

Play MP3 files

Remove boot messages

Remove the Raspberry Pi logo from boot screen

Remove unnecessary files from Raspberry Pi

Show all/hidden folders/file

Show a list of Python modules installed on systems

Raspberry Pi board info / CPU info

Overclock Raspberry Pi without voiding warranty

Freeing up RAM on Raspberry Pi

Set memory split between ARM and GPU in Raspberry Pi

Capture a screenshot using Raspberry Pi

Find the IP address of the Raspberry Pi

Buy a Raspberry Pi case

Make your own Raspberry Pi case

Use Chrome browser in Raspberry Pi

Shut down your Raspberry Pi

I would like to connect x device to my Raspberry Pi. How can I be sure it is going to work?

Some useful commands

Resources for advanced users

Projects

The touchscreen car dashboard

A talking book player

The Morse code transmitter

The automated pet feeder

Home automation system using Raspberry Pi and Arduino

Face-recognizing safe with Raspberry Pi

Supercomputer

Useful resources

Summary

Index