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  • Book Overview & Buying Raspberry Pi Essentials
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Raspberry Pi Essentials

Raspberry Pi Essentials

By : Jack Creasey
3.8 (5)
Buy this Book
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Raspberry Pi Essentials

Raspberry Pi Essentials

3.8 (5)
By: Jack Creasey
Buy this Book

Overview of this book

Programmers new to the Raspberry Pi and novice programmers with little to no experience with micro board computing will find the book useful. A basic knowledge of programming languages in general will prove useful for a better understanding of the topics.
Table of Contents (10 chapters)
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Preface
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Preface
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What this book covers
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What you need for this book
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Who this book is for
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Conventions
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Reader feedback
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Customer support
Free Chapter
1
1. Getting Started with Raspberry Pi
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1. Getting Started with Raspberry Pi
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Let's get started
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Unboxing the Raspberry Pi
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Local display, keyboard, mouse, or remote headless access
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Selecting a screen
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Getting your SD Card ready
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Booting the Raspberry Pi for the first time
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A quick tour of the desktop
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Instructions for downloading all project files
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Summary
2
2. Configuring the Raspberry Pi Desktop and Software
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2. Configuring the Raspberry Pi Desktop and Software
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Hardware and software networking configuration
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Configuring the Raspberry Pi desktop and software
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Desktop and file manager accelerators
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Project 1 – Building a talking clock with a Bash script
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Building a talking clock with Python 3
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Summary
3
3. Raspberry Pi and Cameras
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3. Raspberry Pi and Cameras
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Connecting cameras to the Raspberry Pi
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PiCam and PiNoIR
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Webcams
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Project architecture for the Raspberry Pi security camera
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Features and limitations of the cameras
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Project 1 – Running raspivid as a background service
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Project 1a – Creating a Bash script to drive raspivid
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Project 1b – Creating a movement detector with a USB camera
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Project 2 – Combining the webcam movement detector and the PiCam camera
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Project 3 – Creating a simple Python GUI for the security application
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Summary
4
4. Raspberry Pi Audio Input and Output
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4. Raspberry Pi Audio Input and Output
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Audio quality and bandwidth
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Audio capability on the Raspberry Pi
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Understanding the ALSA configuration
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Configuring the Raspberry Pi to support high-quality sound
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Project 1 – Installing an advanced audio playback application
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Building an Internet radio based on VLC and Raspberry Pi
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Project 2a – Running VLC in the background for the Internet radio
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Project 2b – Designing a playlist file for the Internet radio
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Project 2c – Parsing the playlist file for the Internet radio
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Project 2d – Implementing a Python text interface to VLC
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Project 3 – Implementing a TKinter GUI for the Internet radio
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Recording sound files on the Pi
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Summary
5
5. Port Input and Output on the Raspberry Pi
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5. Port Input and Output on the Raspberry Pi
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Understanding Raspberry Pi digital input and output ports
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Driving LEDs as output indicators
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TKinter LED demo
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TKinter switch demo
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Adding a physical switch interface to the Internet radio
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Project 1 – Add a switch interface to the Internet radio
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Summary
6
6. Driving I2C Peripherals on the Raspberry Pi
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6. Driving I2C Peripherals on the Raspberry Pi
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Getting started with I2C
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Project 1 – Python control of a PWM board driving RC servo motors
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Summary
7
7. Going Mobile with Raspberry Pi
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7. Going Mobile with Raspberry Pi
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Remote access to the Raspberry Pi
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Remote access from Linux and OSX
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Testing your remote session from a PC or Mac
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Battery power systems
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Project 1 – Selecting a project battery capacity
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Summary
8
8. Creating a Raspberry Pi Line-following Robot
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8. Creating a Raspberry Pi Line-following Robot
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Implementing a line-following robot
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Line-following robot architecture
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Implementing rbuttons.py
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Implementing rwheel.py
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Implementing navigate.py
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Steering algorithm
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Time to build the mobile system
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Line-following robot
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Summary
9
Index
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Index

Implementing rwheel.py

The third module we will explore is rwheel.py; it uses the smbus library to access I2C peripherals. If you remember, back in Chapter 6, Driving I2C Peripherals on the Raspberry Pi, the use of the smbus library functions requires root privileges and is limited to Python 2. At that time, we suggested starting the Python 2 IDLE IDE using the sudo idle command line. This strategy resolved a potential development problem, so again, you should start IDLE from the command line. We will programmatically set the required privileges when we use all the programs together.

Downloading rwheel.py and test-rwheel.py

To download rwheel.py and test-rwheel.py files, perform the following steps:

  1. Use the command line to open a new instance using sudo idle.

  2. Download the rwheel.py and test-rwheel.py from the Chapter 8 folder at http://1drv.ms/1ysAxkl.

  3. Open rwheel.py in the Python IDE.

  4. Review the key functions in the following table:

    Function

    Description

    main()

    This function calls the PCA9685_reset...

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