Book Image

Internet of Things with Raspberry Pi 3

By : Maneesh Rao
Book Image

Internet of Things with Raspberry Pi 3

By: Maneesh Rao

Overview of this book

This book is designed to introduce you to IoT and Raspberry Pi 3. It will help you create interesting projects, such as setting up a weather station and measuring temperature and humidity using sensors; it will also show you how to send sensor data to cloud for visualization in real-time. Then we shift our focus to leveraging IoT for accomplishing complex tasks, such as facial recognition using the Raspberry Pi camera module, AWS Rekognition, and the AWS S3 service. Furthermore, you will master security aspects by building a security surveillance system to protect your premises from intruders using Raspberry Pi, a camera, motion sensors, and AWS Cloud. We'll also create a real-world project by building a Wi-Fi – controlled robot car with Raspberry Pi using a motor driver circuit, DC motor, and a web application. This book is a must-have as it provides a practical overview of IoT’s existing architectures, communication protocols, and security threats at the software and hardware levels—security being the most important aspect of IoT.
Table of Contents (11 chapters)

Buzzer

We use a buzzer that is an important component of our surveillance system. In the event a trespasser bypasses the manual security, our surveillance system will not miss the trespasser. When detected near the restricted area, an alarm is raised with the help of the buzzer, which will alert the security people and force the trespasser to run away.

We make use of a piezo buzzer, which is readily available and cost-effective. A piezo buzzer is built of a piezo-electric material. The working of the piezo buzzer is based on the inverse of the principle of piezo electricity. The principle of piezo electricity states that whenever mechanical pressure is applied on piezo electric material, it generates electricity. And piezo buzzers follow the opposite principle, which states that when a voltage is applied on a piezo electric element, it deforms back and forth (a change in dimension...