Book Image

Mastering IOT

By : Colin Dow, Perry Lea
Book Image

Mastering IOT

By: Colin Dow, Perry Lea

Overview of this book

The Internet of Things (IoT) is the fastest growing technology market. Industries are embracing IoT technologies to improve operational expenses, product life, and people's well-being. We’ll begin our journey with an introduction to Raspberry Pi and quickly jump right into Python programming. We’ll learn all concepts through multiple projects, and then reinforce our learnings by creating an IoT robot car. We’ll examine modern sensor systems and focus on what their power and functionality can bring to our system. We’ll also gain insight into cloud and fog architectures, including the OpenFog standards. The Learning Path will conclude by discussing three forms of prevalent attacks and ways to improve the security of our IoT infrastructure. By the end of this Learning Path, we will have traversed the entire spectrum of technologies needed to build a successful IoT system, and will have the confidence to build, secure, and monitor our IoT infrastructure. This Learning Path includes content from the following Packt products: Internet of Things Programming Projects by Colin Dow Internet of Things for Architects by Perry Lea
Table of Contents (34 chapters)
Title Page
Copyright
About Packt
Contributors
Preface
Free Chapter
1
The IoT Story
Index

Reading the state from an infrared motion sensor


Alarm systems using motion sensors are a ubiquitous part of our society. With our Raspberry Pi, they are incredibly easy to build. We will cover the following in this section:

  • What is a PIR sensor?
  • Using the GPIO buzzer class
  • Building a basic alarm system

What is a PIR sensor?

PIR sensors, a type of motion sensor, are used to detect motion. Applications for PIR sensors are pretty much based on detecting motion for security systems. PIR stands for passive infrared, and PIR sensors contain a crystal that detects low-level radiation. PIR sensors are actually constructed in two halves, as it is the difference between the halves that detects motion. The following is a photo of an inexpensive PIR sensor:

Note

In the preceding photo, we can see the positive (+), negative (-), and signal (S) pins. This particular PIR sensor sits well on a breadboard.

The following is the wiring diagram of our PIR circuit. The positive pin connects to the 5 V DC output on...