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Internet of Things Projects with ESP32
Internet of Things Projects with ESP32

Internet of Things Projects with ESP32: Build exciting and powerful IoT projects using the all-new Espressif ESP32

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Internet of Things Projects with ESP32

Making Visual Data and Animation on an LCD

The ESP32 chip and module consists of general-purpose input/output (GPIO) pins to enable sensing and actuating. In this chapter, we will learn how to read sensor data from the ESP32 GPIO. We will also talk about using an LCD to display data with the ESP32 chip. In addition to this, we will show sensory information such as temperature and humidity in the LCD. Ultimately, we will build a simple IoT weather monitoring system with the ESP32 board.

We will see how to work with an LCD by following step-by-step instructions. You will also learn how to use the ESP32 board to detect the weather and display it on LCD by the end of this chapter.

The following topics will be covered in this chapter:

  • Introduction to ESP32 GPIO
  • Introduction to IoT for weather monitoring systems
  • Reading temperature and humidity from a sensor device
  • Displaying information...

Technical requirements

Before we begin, make sure that you have the following things ready:

  • A computer with an OS, such as Windows, Linux, or Mac, installed.
  • An ESP32 development board. The ESP-WROVER-KIT board from Espressif is recommended.
  • An ESP32 development environment configured on your computer.

  • An DHT22 sensor module.
  • The CoolTerm tool, which can read and write data over serial communication (UART). This is available for Windows, Linux, and Mac. We set our serial tool to the ESP32 board with Baudrate 115200.

Introduction to ESP32 GPIO

The ESP32 chip features forty physical GPIO pads. Some GPIO pads cannot be used or do not have the corresponding pin on the chip package. For development boards based on the ESP32 chip or module, some board makers probably expose all ESP32 GPIO pins. However, some board makers also expose ESP32 GPIO pins but add additional pins such as battery, voltage, exclusive sensor, and ground.

Since there are many ESP32 development board models, we cannot explore all board models. Instead, we will focus on the ESP-WROVER-KIT board from Espressif.

We can access GPIO pins on the ESP-WROVER-KIT board with three locations. You can see these locations from the ESP-WROVER-KIT board in the following image. Some GPIO labels are shown in the board body so that we can see all of the GPIO pins:

Figure 2-1: GPIO pins from an ESP-WROVER-KIT board

Some GPIO pins are used for...

Introduction to IoT for weather monitoring systems

A weather monitoring system senses the state of the atmosphere, such as its temperature, humidity, and weather conditions (clear, stormy, and so on). To get the state of the atmosphere, we need sensors.

We can design a simple model for an IoT weather monitoring system as shown next in Figure 2-2. An IoT board with sensor devices can sense physical conditions such as temperature and humidity. Some IoT weather monitoring systems can display their sensor values on a monitor or LCD display:

Figure 2-2: A simple model for an IoT weather Monitoring System

Now that we've discussed the weather monitoring system and its basic architecture, let's start building our weather monitoring system. In the next section, we'll learn how to read temperature and humidity using a sensor device and an ESP32 board.

...

Reading temperature and humidity from a sensor device

In this section, we'll build a simple program to read temperature and humidity from sensor devices. We'll use the DHT22 sensor module for this. This sensor device is easy to find on online stores such as Adafruit, SparkFun, and AliExpress.

Our project scenario is to read temperature and humidity values from a sensor device. Then, we will print sensor values on a serial Terminal. After doing this, we will implement our hardware wiring and develop a program.

Wiring

Let's begin by exploring the DHT22 sensor module. This module can sense temperature and humidity. In general, the DHT22 has four pins. You can see the sensor pinout in Figure 2-3:

Figure 2-3: A...

Displaying information using an LCD

Hardware wiring

If you have the ESP-WROVER-KIT board, you don't need an additional LCD to perform hardware wiring. Otherwise, if you use another LCD module, you can connect the LCD module to the ESP32 board via ESP32 SPI pins...

Making a weather monitoring system

In this section, we'll build a simple weather monitoring system. We'll use the skills that we've learned about, such as reading temperature and humidity from a DHT22 sensor device. Ultimately we'll be able to display the temperature and humidity on the LCD after reading from the sensor device.

Let's begin by creating a project.

Creating a project

To simplify our weather monitoring system project, we will copy the previous project named lcddemo and create a project called weather. Our main program is weather.c on the main folder. You can see a project structure shown in figure 2-16:

Figure 2-16: Project structure for the weather system

Now, let's move on to hardware...

Summary

In this chapter, we looked at a brief introduction that weather systems. Here, we made a simple ESP32 program to sense temperature and humidity using the DHT22 sensor module. Furthermore, we worked with the LCD on the ESP32 board, and were able to access the LCD modules through the ESP32 board. Lastly, we also displayed temperature and humidity data from a sensor to the LCD display. You can now compile and flash any program to your ESP32 board.

In the next chapter, we will learn how to build a simple game on an ESP32 board. We will also cover gaming-embedded systems.

Further reading

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Key benefits

  • Getting to know the all new powerful EPS32 boards and build interesting Internet of Things projects
  • Configure your ESP32 to the cloud technologies and explore the networkable modules that will be utilised in your IoT projects
  • A step-by-step guide that teaches you the basic to advanced IoT concepts with ESP32

Description

ESP32 is a low-cost MCU with integrated Wi-Fi and BLE. Various modules and development boards-based on ESP32 are available for building IoT applications easily. Wi-Fi and BLE are a common network stack in the Internet of Things application. These network modules can leverage your business and projects needs for cost-effective benefits. This book will serve as a fundamental guide for developing an ESP32 program. We will start with GPIO programming involving some sensor devices. Then we will study ESP32 development by building a number of IoT projects, such as weather stations, sensor loggers, smart homes, Wi-Fi cams and Wi-Fi wardriving. Lastly, we will enable ESP32 boards to execute interactions with mobile applications and cloud servers such as AWS. By the end of this book, you will be up and running with various IoT project-based ESP32 chip.

Who is this book for?

This book is for those who want to build a powerful and inexpensive IoT projects using the ESP32.Also for those who are new to IoT, or those who already have experience with other platforms such as Arduino, ESP8266, and Raspberry Pi.

What you will learn

  • Understand how to build a sensor monitoring logger
  • Create a weather station to sense temperature and humidity using ESP32
  • Build your own W-iFi wardriving with ESP32. Use BLE to make interactions between ESP32 and Android
  • Understand how to create connections to interact between ESP32 and mobile applications
  • Learn how to interact between ESP32 boards and cloud servers
  • Build an IoT Application-based ESP32 board
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Mar 30, 2019
Length: 252 pages
Edition : 1st
Language : English
ISBN-13 : 9781789956870
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Publication date : Mar 30, 2019
Length: 252 pages
Edition : 1st
Language : English
ISBN-13 : 9781789956870
Category :
Tools :

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Table of Contents

11 Chapters
Getting Started with ESP32 Chevron down icon Chevron up icon
Making Visual Data and Animation on an LCD Chevron down icon Chevron up icon
Building a Simple Game with an Embedded ESP32 Board Chevron down icon Chevron up icon
Building a Sensor Monitoring Logger Chevron down icon Chevron up icon
Controlling IoT Devices over the Internet Chevron down icon Chevron up icon
Building an IoT Weather Station Chevron down icon Chevron up icon
Making Your Own Wi-Fi Wardriving Chevron down icon Chevron up icon
Building Your Own Wi-Fi Cam Chevron down icon Chevron up icon
Making IoT Devices Interact with Mobile Applications Chevron down icon Chevron up icon
Building IoT Monitoring with Cloud Technology Chevron down icon Chevron up icon
Other Books You May Enjoy Chevron down icon Chevron up icon

Customer reviews

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2 star 25%
1 star 50%
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Theresa Albright Jan 12, 2021
Full star icon Full star icon Full star icon Full star icon Full star icon 5
I scanned through the book and was impressed how it walked through going from simple sensor reading to HTTP, CLOUD, and Android control of Smart Home automation.
Amazon Verified review Amazon
morandotti ferruccio Jun 11, 2019
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Il libro di per sé è interessante, ma purtroppo i programmi di esempio riportati non fanno uso dell'IDE di Arduino ma usano un puro linguaggio C per cui richiedono un ambiente di sviluppo per il C.Come ambiente di sviluppo viene utilizzato un SDK che, a detta del libro, è della Espressif ma che non sono riuscito a trovare.
Amazon Verified review Amazon
GRR! Jul 27, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
Does not cover the basics in a logical fashion before moving on to bigger things. A handful of pages in and the author is attacking the topic of setting up an SD card. Whoa, billy!!
Amazon Verified review Amazon
Gunadi Kurniawan Oct 21, 2019
Full star icon Full star icon Empty star icon Empty star icon Empty star icon 2
This book broke many cardinal rules of writing a training book:1. The writer assumes after giving the link to the Espressif website, then his work is done and the reader will understand all the contents. This is a tall order because the link is very large and has many sublinks.2. The writer assumes that all the online links are static, online links changes constantly.3. Need to contain more safety net, for example if . . . then do this. The book need more checklist/snapshots to make sure the reader are still following his guidance.I bought this book because it uses the official espressif hardware (ESP Wroover kit), but on every page I am left with so many unanswered questions that I ended up abandoning this book.
Amazon Verified review Amazon
Dave Waller Feb 23, 2020
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
I had great hopes for this book, at last a book that would show you how to use the ESP32 without relying on the Arduino software.Unfortunately the book has a huge number of issues, some of which are as follows:1. The book is out of date and recommends you download an older version of the software - the ESP32-IDF and tool chain. (I accept there is not much that can be done about this, but I did get the book when it was released and it was out of date straight away2. The graphics / pictures are out of step with the titles and cross references3. Some cross references are missing (eg the page says "See the following for further details" but does not actually have anything following4. The example code is very poorly written. The samples provided in the ESP32-IDF are far better and well commented.5. There is missing code from some of the examples so that they will never compile6. There is very little explanation of the code samples or what the functions called actually do.Overall this book seems to have been a hasty rewrite of the many other books on Arduino devices, ie light one LED, then light several LEDs but does not give you any real feel of what can be done, or what are the advantages of programming using FreeRTOS and ESP32-IDF.
Amazon Verified review Amazon
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