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  • Book Overview & Buying Raspberry Pi By Example
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Raspberry Pi By Example

Raspberry Pi By Example

By : Kakkar
5 (1)
Buy this Book
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Raspberry Pi By Example

Raspberry Pi By Example

5 (1)
By: Kakkar
Buy this Book

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!
Table of Contents (17 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
Lock Free Chapter
1
1. Introduction to Raspberry Pi and Python
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1. Introduction to Raspberry Pi and Python
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Single-board computers
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Raspberry Pi
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Operating systems
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Setting up the Raspberry Pi
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Getting started with Python
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Summary
2
2. Minecraft Pi
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2. Minecraft Pi
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Introduction to Minecraft Pi
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Playing Minecraft Pi
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Python programming for Minecraft Pi
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Summary
3
3. Building Games with PyGame
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3. Building Games with PyGame
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Introducing PyGame
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Installing PyGame
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Drawing a binary fractal tree
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Building a snake game
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Summary
4
4. Working with a Webcam and Pi Camera
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4. Working with a Webcam and Pi Camera
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Working with webcams
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Working with the Pi Camera and NoIR Camera modules
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Summary
5
5. Introduction to GPIO Programming
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5. Introduction to GPIO Programming
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Introducing GPIO pins
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Building an LED Blinker
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Installing PiGlow
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Using PiGlow
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Building a binary clock
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Summary
6
6. Creating Animated Movies with Raspberry Pi
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6. Creating Animated Movies with Raspberry Pi
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Introducing stop-motion animation
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Setting up the prerequisites
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Rendering the video
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Summary
7
7. Introduction to Computer Vision
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7. Introduction to Computer Vision
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Introducing Computer Vision
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Introducing OpenCV
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Setting up Pi for Computer Vision
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Introducing NumPy
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Working with images
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Working with Webcam using OpenCV
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Retrieving image properties
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Arithmetic operations on images
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Splitting and merging image color channels
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Logical operations on images
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Colorspaces and conversions
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Tracking in real time based on color
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Summary
8
8. Creating Your Own Motion Detection and Tracking System
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8. Creating Your Own Motion Detection and Tracking System
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Thresholding images
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Noise
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Morphological transformations on images
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Motion detection and tracking
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Summary
9
9. Grove Sensors and the Raspberry Pi
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9. Grove Sensors and the Raspberry Pi
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Introducing the GrovePi
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Setting up the GrovePi
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Displaying the weather
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Intruder detection system
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Summary
10
10. Internet of Things with the Raspberry Pi
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10. Internet of Things with the Raspberry Pi
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Introducing the Internet of Things
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Installing the Twitter API for Python
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Setting up a SQLite database in Python
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Building a tweeting weather station
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Summary
11
11. Build Your Own Supercomputer with Raspberry Pi
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11. Build Your Own Supercomputer with Raspberry Pi
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Introducing a Pi-based supercomputer
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Installing and configuring MPICH2 and MPI4PY
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Setting up the Raspberry Pi cluster
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Setting up SSH access from the host to the client
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Running code in parallel
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Performance benchmarking of the cluster
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Introducing N-Body simulations
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Installing and running GalaxSee
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Summary
12
12. Advanced Networking with Raspberry Pi
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12. Advanced Networking with Raspberry Pi
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Introducing DHCP
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A few networking concepts
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Configuring a Raspberry Pi to act as a DHCP server
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Introducing Domain Naming System (DNS)
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Setting up a DNS server on the Pi
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Configuring the setup for a web server
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Automating node discovery in a network
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Summary
13
13. Setting Up a Web Server on the Raspberry Pi
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13. Setting Up a Web Server on the Raspberry Pi
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Introducing and installing Apache on Raspbian
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Installing PHP and MySQL
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Installing WordPress
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Summary
14
14. Network Programming in Python with the Pi
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14. Network Programming in Python with the Pi
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The basics of sockets
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The difference between TCP and UDP
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Looking back
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A Telnet client in Python
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A chat program
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References
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Exercise
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Summary
15
A. Newer Raspberry Pi Models
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A. Newer Raspberry Pi Models
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The Raspberry Pi Zero
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The Raspberry Pi 3
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Index
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Index

Working with Webcam using OpenCV

OpenCV has a functionality to work with standard USB webcams. Let's take a look at an example to capture an image from a webcam:

import cv2

# initialize the camera
cam = cv2.VideoCapture(0)
ret, image = cam.read()

if ret:
    cv2.imshow('SnapshotTest',image)
    cv2.waitKey(0)
    cv2.destroyWindow('SnapshotTest')
    cv2.imwrite('/home/pi/book/output/SnapshotTest.jpg',image)
cam.release()

In the preceding code, cv2.VideoCapture() creates a video capture object. The argument for it can either be a video device or a file. In this case, we are passing a device index, which is 0. If we have more cameras, then we can pass the appropriate device index based on what camera to choose. If you have one camera, just pass 0.

You can find out the number of cameras and associated device indexes using the following command:

ls -l /dev/video*

Once cam.read() returns a Boolean value ret and the frame which is the image it captured. If the image capture is successful, then...

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