Raspberry Pi Essentials电子书

Raspberry Pi Essentials

Table of Contents

Raspberry Pi Essentials

Credits

About the Author

About the Reviewers

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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

Let's get started

Unboxing the Raspberry Pi

Configure power for Pi

Local display, keyboard, mouse, or remote headless access

Selecting a screen

Connecting VGA displays

Getting your SD Card ready

Booting the Raspberry Pi for the first time

It's time to power up the Pi

No video on initial boot

Final installation configuration

A quick tour of the desktop

Instructions for downloading all project files

Summary

2. Configuring the Raspberry Pi Desktop and Software

Hardware and software networking configuration

Client reservations for Ethernet and wireless

Configuring the Raspberry Pi desktop and software

Keeping the development environment up to date

Setting up a screensaver

Manually locking your session

Desktop and file manager accelerators

Adding root privileges to the PCManFM file manager

Programming on the Raspberry Pi

Developing with Bash shell scripts

Project 1 – Building a talking clock with a Bash script

Creating project files and directories

Building a talking clock with Python 3

Summary

3. Raspberry Pi and Cameras

Connecting cameras to the Raspberry Pi

PiCam and PiNoIR

Webcams

Project architecture for the Raspberry Pi security camera

Features and limitations of the cameras

Testing camera capability

Viewing CPU resource for the luvcview application

Verifying the PiCam operation

Controlling data storage for video

Testing the data storage limit

Project 1 – Running raspivid as a background service

Project 1a – Creating a Bash script to drive raspivid

Testing the picam.sh script

Project 1b – Creating a movement detector with a USB camera

Test the webcam installation

A final word on resolution and frame rate for movement detection

Project 2 – Combining the webcam movement detector and the PiCam camera

Project 3 – Creating a simple Python GUI for the security application

Summary

4. Raspberry Pi Audio Input and Output

Audio quality and bandwidth

Audio capability on the Raspberry Pi

Limited headphone output

Understanding the ALSA configuration

Configuring the default device for ALSA

Configuring the Raspberry Pi to support high-quality sound

Project 1 – Installing an advanced audio playback application

Building an Internet radio based on VLC and Raspberry Pi

Project 2a – Running VLC in the background for the Internet radio

Starting VLC automatically at reboot

Project 2b – Designing a playlist file for the Internet radio

Chapter 4 supplemental materials

Project 2c – Parsing the playlist file for the Internet radio

Project 2d – Implementing a Python text interface to VLC

Project 3 – Implementing a TKinter GUI for the Internet radio

Running tktest.py

Creating a clock in the radio UI

Running tkradio.py

Recording sound files on the Pi

Summary

5. Port Input and Output on the Raspberry Pi

Understanding Raspberry Pi digital input and output ports

Using breakout boards with the Raspberry Pi

Driving LEDs as output indicators

Python LED demo

TKinter LED demo

Block 1 – initialization

Block 2 – on/off buttons

Block 3 – monostable function

Block 4 – loop flash

Block 5 – PWM flash

Block 6 – TKPWM flash and toggle tkrun

Block 7 – start the application

TKinter switch demo

Block 1 – the activity indicator

Block 2 – the Edge switch detector

Block 3 – the Event switch detector

Adding a physical switch interface to the Internet radio

Project 1 – Add a switch interface to the Internet radio

Summary

6. Driving I2C Peripherals on the Raspberry Pi

Getting started with I2C

Understanding address fields

Driving RC servos

Raspberry Pi software requirements for SMBus

Programming the PCA 9685 to drive a servo

PCA 9685 addressing and registers

Project 1 – Python control of a PWM board driving RC servo motors

Code block 1 – imports, constants, and variables

Code block 2 – I2C access functions

Code block 3 – the PCA9685 specific code

Code block 4: the test code

Other demo code

Summary

7. Going Mobile with Raspberry Pi

Remote access to the Raspberry Pi

Using PuTTY remote access

Installing PuTTY on Microsoft Windows

Remote access from Linux and OSX

Testing your remote session from a PC or Mac

Battery power systems

Selecting regulators

Measuring Raspberry Pi project current

Potential battery power solutions

Adafruit PowerBoost 1000 Basic

Adafruit PowerBoost 500C

Power banks as an alternative mobile power system

Project 1 – Selecting a project battery capacity

Summary

8. Creating a Raspberry Pi Line-following Robot

Implementing a line-following robot

Line-following robot architecture

Software architecture

Software module functions

Implementing rbuttons.py

Downloading rbuttons.py and test-buttons.py

Implementing rcam.py

Installing the pip manager

Installing the pip package manager

Installing Pillow

Downloading rcam.py

Implementing rwheel.py

Downloading rwheel.py and test-rwheel.py

Implementing navigate.py

Downloading navigate.py

The steering methodology

Open loop servo control

Analyzing camera data

Steering algorithm

Time to build the mobile system

Checking wireless connectivity

Line-following robot

Assembling the robot

How to bring up your robot

Navigating the robot

Summary

Index