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)

Displaying sensory data on our dashboard

To provide our dashboard data, we will create a new Python file called SecurityData.py where we will store the SecurityData class. Before we do that, let's build our circuit.

Home security dashboard with a temperature sensor

We will build our first version of the home security dashboard with a DHT11 temperature and humidity sensor, a PIR sensor, and a latching button (or key switch). The following is the Fritzing diagram for our home security dashboard:

The circuit connects as follows:

  • GND from DHT11 to GND
  • VCC on DHT11 to 5V DC
  • Signal on the DHT11 to GPIO pin 19
  • GND from PIR sensor to GND
  • VCC on PIR sensor to 5V DC
  • Signal on PIR sensor to GPIO pin4
  • One end of the latching button...