Book Image

Internet of Things with Python

By : Gaston C. Hillar
Book Image

Internet of Things with Python

By: Gaston C. Hillar

Overview of this book

Internet of Things (IoT) is revolutionizing the way devices/things interact with each other. And when you have IoT with Python on your side, you'll be able to build interactive objects and design them. This book lets you stay at the forefront of cutting-edge research on IoT. We'll open up the possibilities using tools that enable you to interact with the world, such as Intel Galileo Gen 2, sensors, and other hardware. You will learn how to read, write, and convert digital values to generate analog output by programming Pulse Width Modulation (PWM) in Python. You will get familiar with the complex communication system included in the board, so you can interact with any shield, actuator, or sensor. Later on, you will not only see how to work with data received from the sensors, but also perform actions by sending them to a specific shield. You'll be able to connect your IoT device to the entire world, by integrating WiFi, Bluetooth, and Internet settings. With everything ready, you will see how to work in real time on your IoT device using the MQTT protocol in python. By the end of the book, you will be able to develop IoT prototypes with Python, libraries, and tools.
Table of Contents (19 chapters)
Internet of Things with Python
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Preface
Index

Chapter 5. Working with Digital Inputs, Polling and Interrupts

In this chapter, we will use digital inputs to make it possible for users to interact with the board while we process the HTTP requests. We will:

  • Understand the difference between pull-up and pull-down resistors to connect pushbuttons

  • Wire digital input pins with pushbuttons

  • Use polling to check the pushbutton status with the mraa and wiring-x86 libraries

  • Combine polling to read digital inputs while running a RESTful API

  • Write code that maintains consistency when we provide shared features with electronic components and APIs

  • Use interrupts and the mraa library to detect pressed pushbuttons

  • Understand the differences, advantages, and trade-offs between polling and interrupts to detect changes in digital inputs