Book Image

Raspberry Pi By Example

By : Arush Kakkar
Book Image

Raspberry Pi By Example

By: Arush Kakkar

Overview of this book

Want to put your Raspberry Pi through its paces right out of the box? This tutorial guide is designed to get you learning all the tricks of the Raspberry Pi through building complete, hands-on hardware projects. Speed through the basics and then dive right in to development! Discover that you can do almost anything with your Raspberry Pi with a taste of almost everything. Get started with Pi Gaming as you learn how to set up Minecraft, and then program your own game with the help of Pygame. Turn the Pi into your own home security system with complete guidance on setting up a webcam spy camera and OpenCV computer vision for image recognition capabilities. Get to grips with GPIO programming to make a Pi-based glowing LED system, build a complete functioning motion tracker, and more. Finally, get ready to tackle projects that push your Pi to its limits. Construct a complete Internet of Things home automation system with the Raspberry Pi to control your house via Twitter; turn your Pi into a super-computer through linking multiple boards into a cluster and then add in advanced network capabilities for super speedy processing!

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Raspberry Pi By Example
Arush Kakkar
Apr, 2016 | 294 pages
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Table of Contents (22 chapters)
Raspberry Pi By Example
Raspberry Pi By Example
Credits
Credits
About the Authors
About the Authors
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introduction to Raspberry Pi and Python
Introduction to Raspberry Pi and Python
Single-board computers
Raspberry Pi
Operating systems
Setting up the Raspberry Pi
Getting started with Python
Summary
2
Minecraft Pi
Minecraft Pi
Introduction to Minecraft Pi
Playing Minecraft Pi
Python programming for Minecraft Pi
Summary
3
Building Games with PyGame
Building Games with PyGame
Introducing PyGame
Installing PyGame
Drawing a binary fractal tree
Building a snake game
Summary
4
Working with a Webcam and Pi Camera
Working with a Webcam and Pi Camera
Working with webcams
Working with the Pi Camera and NoIR Camera modules
Summary
5
Introduction to GPIO Programming
Introduction to GPIO Programming
Introducing GPIO pins
Building an LED Blinker
Installing PiGlow
Using PiGlow
Building a binary clock
Summary
6
Creating Animated Movies with Raspberry Pi
Creating Animated Movies with Raspberry Pi
Introducing stop-motion animation
Setting up the prerequisites
Rendering the video
Summary
7
Introduction to Computer Vision
Introduction to Computer Vision
Introducing Computer Vision
Introducing OpenCV
Setting up Pi for Computer Vision
Introducing NumPy
Working with images
Working with Webcam using OpenCV
Retrieving image properties
Arithmetic operations on images
Splitting and merging image color channels
Logical operations on images
Colorspaces and conversions
Tracking in real time based on color
Summary
8
Creating Your Own Motion Detection and Tracking System
Creating Your Own Motion Detection and Tracking System
Thresholding images
Noise
Morphological transformations on images
Motion detection and tracking
Summary
9
Grove Sensors and the Raspberry Pi
Grove Sensors and the Raspberry Pi
Introducing the GrovePi
Setting up the GrovePi
Displaying the weather
Intruder detection system
Summary
10
Internet of Things with the Raspberry Pi
Internet of Things with the Raspberry Pi
Introducing the Internet of Things
Installing the Twitter API for Python
Setting up a SQLite database in Python
Building a tweeting weather station
Summary
11
Build Your Own Supercomputer with Raspberry Pi
Build Your Own Supercomputer with Raspberry Pi
Introducing a Pi-based supercomputer
Installing and configuring MPICH2 and MPI4PY
Setting up the Raspberry Pi cluster
Setting up SSH access from the host to the client
Running code in parallel
Performance benchmarking of the cluster
Introducing N-Body simulations
Installing and running GalaxSee
Summary
12
Advanced Networking with Raspberry Pi
Advanced Networking with Raspberry Pi
Introducing DHCP
A few networking concepts
Configuring a Raspberry Pi to act as a DHCP server
Introducing Domain Naming System (DNS)
Setting up a DNS server on the Pi
Configuring the setup for a web server
Automating node discovery in a network
Summary
13
Setting Up a Web Server on the Raspberry Pi
Setting Up a Web Server on the Raspberry Pi
Introducing and installing Apache on Raspbian
Installing PHP and MySQL
Installing WordPress
Summary
14
Network Programming in Python with the Pi
Network Programming in Python with the Pi
The basics of sockets
The difference between TCP and UDP
Looking back
A Telnet client in Python
A chat program
References
Exercise
Summary
Newer Raspberry Pi Models
Newer Raspberry Pi Models
The Raspberry Pi Zero
The Raspberry Pi 3
Index
Index

A Telnet client in Python

The Telnet client is a simple command-line program that is used to connect to socket servers and exchange messages. The following is an example of how to use Telnet to connect to https://www.google.com and fetch the homepage:

$ telnet www.google.com 80

This command will connect to www.google.com on port 80.

$ telnet www.google.com 80
Trying 74.125.236.69...
Connected to www.google.com.
Escape character is '^]'

Now that it is connected, the Telnet command can take user input and send it to the respective server, and whatever the server replies will be displayed in the terminal. For example, send the HTTP GET command in the following format and hit Enter twice:

GET / HTTP/1.1

Sending this will generate a response from the server. Now we will make a similar Telnet program. The program is simple: we will implement a program that takes user input and fetches results from the remote server in parallel using the threads. One thread will keep receiving messages from the server...

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