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Raspberry Pi Home Automation with Arduino - Second Edition

You're reading from Raspberry Pi Home Automation with Arduino - Second Edition

Product type Book

Published in Feb 2015

Publisher

ISBN-13 9781784399207

Pages 148 pages

Edition 1st Edition

Languages

Concepts

Home Automation

Author (1):

Andrew K. Dennis

Table of Contents (16) Chapters

Raspberry Pi Home Automation with Arduino Second Edition

Credits

About the Author

About the Reviewers

www.PacktPub.com

Preface

1. An Introduction to the Raspberry Pi, Arduino, and Home Automation

2. Getting Started – Setting Up Your Raspberry Pi and Arduino

3. Central Air and Heating Thermostat

4. Temperature Storage – Setting Up a Database to Store Your Results

5. Parcel Delivery Detector

6. Curtain Automation – Open and Close the Curtains Based on the Ambient Light

7. Water/Damp Detection – Check for Damp/Flooding in Sheds and Basements

8. Wrapping Up

References

Index

Curtain control application

We will now write an application that leverages the photoresistor and uses it to control the motor. There are a few concepts that we will cover quickly before we write the application, in order to provide you with better understanding of how our software works.

Pulse width modulation

Pulse width modulation (PWM) is a method that leverages the digital pins to create an analog result. If a digital pin is switched on, it has a value of 5V, and if switched off, it has a value of 0V. PWM allows us to simulate a value between these two ends.

Using our software, we can create what is known as a square wave. This method involves switching a pin on and off to create a signal to the device connected to the digital pin. In our project, it's a DC motor. Therefore, varying the modulation (that is, changing the number of milliseconds that the pin is switched off versus on) will result in a change of speed of the DC motor.

In order to create PWM in our application, we will need...

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Authors (1)

Andrew K. Dennis

Andrew K. Dennis is a full stack and cybersecurity architect with over 17 years' experience who currently works for Modus Create in Reston, VA. He holds two undergraduate degrees in software engineering and creative computing and a master's degree in information security. Andy has worked in the US, Canada, and the UK in software engineering, e-learning, data science, and cybersecurity across his career, and has written four books on IoT, the Raspberry Pi, and supercomputing. His interests range from the application of pataphysics in computing to security threat modeling. Andy lives in New England and is an organizer of Security BSides CT.

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