Book Image

Internet of Things Programming Projects

By : Colin Dow
Book Image

Internet of Things Programming Projects

By: Colin Dow

Overview of this book

The Internet of Things (IOT) has managed to attract the attention of researchers and tech enthusiasts, since it powerfully combines classical networks with instruments and devices. In Internet of Things Programming Projects, we unleash the power of Raspberry Pi and Python to create engaging projects. In the first part of the book, you’ll be introduced to the Raspberry Pi, learn how to set it up, and then jump right into Python programming. Then, you’ll dive into real-world computing by creating a“Hello World” app using flash LEDs. As you make your way through the chapters, you’ll go back to an age when analog needle meters ruled the world of data display. You’ll learn to retrieve weather data from a web service and display it on an analog needle meter, and build a home security system using the Raspberry Pi. The next project has a modern twist, where we employ the Raspberry Pi to send a signal to a web service that will send you a text when someone is at the door. In the final project, you take what you've learned from the previous two projects and create an IoT robot car that you can use to monitor what your pets are up to when you are away. By the end of this book, you will be well versed in almost every possible way to make your IoT projects stand out.
Table of Contents (21 chapters)

Wiring up our circuit

We will create a doorbell circuit using an active buzzer and an RGB LED. Since we have not discussed RGB LEDs before, we will take a quick look at this amazing little electronic component. We then write a simple test program, using our Raspberry Pi, that will light up the RGB LED and sound the active buzzer.

What is an RGB LED?

An RGB LED is really just three LEDs in one unit: a red one, a green one, and a blue one. Almost any color may be achieved by applying electric current at varying power levels across the selection of input pins. The following is a diagram of such an LED:

As you can see there are red, green, and blue pins, plus a negative pin (-) . When an RGB LED has a negative pin (-), it is...