Book Image

Developing IoT Projects with ESP32

By : Vedat Ozan Oner
Book Image

Developing IoT Projects with ESP32

By: Vedat Ozan Oner

Overview of this book

Developing IoT Projects with ESP32 provides end-to-end coverage of secure data communication techniques from sensors to cloud platforms that will help you to develop production-grade IoT solutions by using the ESP32 SoC. You'll learn how to employ ESP32 in your IoT projects by interfacing with different sensors and actuators using different types of serial protocols. This book will show you how some projects require immediate output for end-users, and cover different display technologies as well as examples of driving different types of displays. The book features a dedicated chapter on cybersecurity packed with hands-on examples. As you progress, you'll get to grips with BLE technologies and BLE mesh networking and work on a complete smart home project where all nodes communicate over a BLE mesh. Later chapters will show you how IoT requires cloud connectivity most of the time and remote access to smart devices. You'll also see how cloud platforms and third-party integrations enable endless possibilities for your end-users, such as insights with big data analytics and predictive maintenance to minimize costs. By the end of this book, you'll have developed the skills you need to start using ESP32 in your next wireless IoT project and meet the project's requirements by building effective, efficient, and secure solutions.
Table of Contents (18 chapters)
1
Section 1: Using ESP32
7
Section 2: Local Network Communication
12
Section 3: Cloud Communication

Liquid Crystal Displays (LCDs)

Usually, IoT products come with a mobile or web application to let users interact with the product. However, we may sometimes need to display direct information on the device itself. For such products, we can integrate a display with ESP32.

LCDs are a common type of display that we can use in our IoT projects. They are highly available on the market with a low price tag. They come in a variety of sizes, in other words, columns and rows, that we can select; for example, 16x2, which means there are 16 columns and 2 rows on that type of LCD, with a total of 32 characters to display at a time. There is one such LCD shown in the following figure:

Figure 3.1 – 16x2 LCD

An LCD can operate in 4-bit mode or 8-bit mode, which defines the number of data lines to drive the LCD. However, it is too costly in terms of the GPIO resources on ESP32. Therefore, it is a good idea to use an I2C adapter module to reduce the number of pins...