7. Creating an Image Sensor Using a Camera and OpenCV | Raspberry Pi Sensors

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Raspberry Pi Sensors

By : Rushi Gajjar

4.4 (9)

Raspberry Pi Sensors

4.4 (9)

By: Rushi Gajjar

Overview of this book

This book is perfect for hardware enthusiasts who want to develop amazing projects using Raspberry Pi. Some knowledge and experience working with Linux, C, and Python is a plus, but once you're set up to go, you'll be ready to push the creative capabilities of your Raspberry Pi even further.

Preface

Preface

What this book covers

What you need for this book

Who this book is for

Conventions

Reader feedback

Customer support

Free Chapter

1. Meeting Your Buddy – the Raspberry Pi

1. Meeting Your Buddy – the Raspberry Pi

A glance at the Raspberry Pi board

Setting up for the first time

Connecting the Raspberry Pi to the Internet

A crash course on Linux

Installing useful libraries

python-gpio

Be ready with Python and C

Practice makes you perfect

Summary

2. Meeting the World of Electronics

2. Meeting the World of Electronics

Basic terminologies of electronics

Communication protocols

Useful tips and precautions

Understanding the GPIO port

It's time to glow LEDs!

Summary

3. Measuring Distance Using Ultrasonic Sensors

3. Measuring Distance Using Ultrasonic Sensors

The mysterious ultrasonic sensor

Building the project!

Fixing common problems

A wearable device for the visually impaired

Summary

4. Monitoring the Atmosphere Using Sensors

4. Monitoring the Atmosphere Using Sensors

Sensor selection process

InsideDHT – temperature and humidity sensors

Introducing the photoresistor (photocell)

Building the project

Putting all the parts together

Troubleshooting common problems

Summary

5. Using an ADC to Interface any Analog Sensor with the Raspberry Pi

5. Using an ADC to Interface any Analog Sensor with the Raspberry Pi

Analog-to-digital convertors

MCP3008 for analog-to-digital conversion

Making your own sensor station

Generic software preparation

Using your sensor station – make a temperature logger

Summary

6. Uploading Data Online – Spreadsheets, Mobile, and E-mails

6. Uploading Data Online – Spreadsheets, Mobile, and E-mails

Internet of Things

Hardware setup

Synchronizing the clock with the Internet

Uploading data on Google spreadsheets

Getting notified by e-mails

Integrating everything

Common problems faced

Summary

7. Creating an Image Sensor Using a Camera and OpenCV

7. Creating an Image Sensor Using a Camera and OpenCV

Image processing

OpenCV

Camera interfacing with the RasPi

Live streaming using a network camera

Porting OpenCV

Create a motion detector

Amazing projects for you

Summary

A. Shopping List

Basic requirements

Sensors

Integrated chips

Components

Others

Index

Index

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Live streaming using a network camera

Have you ever wondered whether the RasPi can be used for live streaming purposes? We are going to stream videos on the RasPi on the localhost network using RasPi as a network camera. There are multiple ways to make use of the RasPi for live streaming:

By fixing a camera interfaced with the RasPi being in the same network, you can SSH through the connection and open the camera port through the command-line interface
Use open source software motion to enable live streaming at the local web browser

We will be using motion to get access to the RasPi camera. Motion has a built-in HTTP server that enables the camera view from the web browser. Motion can record videos in MPEG format and capture images in JPEG format. These images and videos can be stored wherever you want, and it does support databases such as MySQL. Enter these commands to install motion on the RasPi:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get -y install bison
sudo apt-get -y install...

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