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 DHT11 sensor module to the microcontroller boards

This section deals with all the hardware components in this chapter. We will begin by connecting the DHT11 to the Blue Pill board. Connecting the DHT11 to microcontroller boards is easy because it only requires three wires.

Connecting the DHT11 to the Blue Pill board

In this section, we will connect the DHT11 to the Blue Pill, as shown here:

Figure 5.3 – The DHT11 connected to a Blue Pill microcontroller board

As we can see, the DHT11 connections are simple. In some DHT11 modules, their manufacturers recommend connecting a 5K-ohm pull-up resistor to the S (signal) pin. However, since 5K resistors are not commercially available, a resistor with a value of 4.7K-ohm is close enough to the recommended one. We did not need to connect a 4.7K-ohm to the DHT11 module that we used in our project because its electronic circuit already had a resistor like that.

Note

Depending on the...