You're reading from DIY Microcontroller Projects for Hobbyists The ultimate project-based guide to building real-world embedded applications in C and C++ programming

Product type Paperback

Published in Jul 2021

Publisher Packt

ISBN-13 9781800564138

Length 320 pages

Edition 1st Edition

Languages

Tools

ARM Cortex

Concepts

Microcontroller

Authors (2):

Miguel Angel Garcia-Ruiz

Pedro Cesar Santana Mancilla

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Table of Contents (16) Chapters

Preface

1. Chapter 1: Introduction to Microcontrollers and Microcontroller Boards

2. Chapter 2: Software Setup and C Programming for Microcontroller Boards FREE CHAPTER

3. Chapter 3: Turning an LED On or Off Using a Push Button

4. Chapter 4: Measuring the Amount of Light with a Photoresistor

5. Chapter 5: Humidity and Temperature Measurement

6. Chapter 6: Morse Code SOS Visual Alarm with a Bright LED

7. Chapter 7: Creating a Clap Switch

8. Chapter 8: Gas Sensor

9. Chapter 9: IoT Temperature-Logging System

10. Chapter 10: IoT Plant Pot Moisture Sensor

11. Chapter 11: IoT Solar Energy (Voltage) Measurement

12. Chapter 12: COVID-19 Digital Body Temperature Measurement (Thermometer)

13. Chapter 13: COVID-19 Social-Distancing Alert

14. Chapter 14: COVID-19 20-Second Hand Washing Timer

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Chapter 8: Gas Sensor

An indoor environment with good air quality is essential to guarantee a healthy environment (Marques and Pitarma, 2017). The MQ-2 gas sensor can be an excellent way to measure the quality parameters of indoor air or as an early fire detection system. In this chapter, you will learn how to build a practical system for detecting gases in the environment (which we will call a gas sensor) and connect the MQ-2 gas sensor to a Blue Pill microcontroller card.

The following main topics will be covered in this chapter:

Introducing the MQ-2 gas sensor
Connecting a gas sensor to the STM32 microcontroller board
Writing a program to read the gas concentration over the sensor board
Testing the system

At the end of this chapter, you will know about the operation of an MQ-2 gas sensor, and you will be able to connect it correctly to the STM32 microcontroller card and view the data obtained from the sensor. You will be able to apply what you have...