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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Introducing the DHT11 humidity and temperature sensor module

In this section, we'll review the DHT11 sensor module. This section also describes what the sensor pins are, and how to connect them to a microcontroller board. The DHT11 is an easy-to-use, practical, and low-cost sensor module that measures temperature within a range of 0 to 50 degrees Celsius, with an error rate of +-2%. It also measures environmental relative humidity (RH) within a range of 20% to 90%, with an accuracy of +-5%. These values can change a bit, depending on the sensor module's manufacturers. The next section describes what RH is, an environmental value that is read by the DHT11 sensor.

What is relative humidity?

Relative humidity is based on a combination of water vapor and the temperature of the environment. It is a ratio of the amount of water vapor present in the air at a certain temperature, expressed as a percentage. Generally, the amount of water vapor has a higher RH in cool air than...