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

15. Other Books You May Enjoy

Connecting a gas sensor to the STM32 microcontroller board

In this section, we will build a gas sensor device utilizing the STM32 Blue Pill microcontroller board and a gas sensor module using the hardware components listed in the Technical requirements section. The gas sensor breakout board connects to the STM32 Blue Pill with four pins:

Analog output (AO): This pin generates an analog signal and must be connected to an analog input of the microcontroller.
DO: This pin generates a digital signal and must be connected to a digital input of the microcontroller.
VCC: Pin to supply power to the sensor (5 V).
GND: Ground connection.

For this project, you will learn how to interface the MQ-2 module with the STM32 board to acquire data in a digital and analog way. Let's start with the digital option.