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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
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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
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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

Understanding the ALSA configuration

Like so many things in the Linux, Debian, and Raspbian environments, the configuration of the sound capabilities is contained in files maintained by the OS. For ALSA, the configuration files are in the /proc/asound directory and can be viewed using File Manager or from the command prompt, as shown in the following screenshot:

In ALSA, the interfaces are associated with the concept of a card and, in larger computers, the audio adapter may be a physical card plugged into a backplane. In the command prompt view shown in the preceding screenshot, there are two cards shown. One is the internal bcm2825 (the chip number for the SOC in the Pi models prior to the 2-B) and the other is the Microsoft Webcam we attached to our system that has a microphone for audio capture.

There are several ALSA utilities that can be started at the command-line prompt:

  • alsamixer: This utility provides controls for volume and can list card and device information

  • aplay: This utility...

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