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

Thin Film Transistor Displays (TFTs)

The color alternative for other types of displays is a TFT display. Actually, TFT is a type of LCD, but the technology is enhanced to lower the power consumption to a level that is comparable to OLED. It still uses backlight, which is the main reason for power consumption, but its graphic capabilities come to play when we need a better user experience. A TFT display is shown in the following figure:

Figure 3.6 – 1.8" TFT screen with 128x160 pixels

In this example, we will use a TFT display for our temperature sensor. The components are as follows:

  • A 1.8" TFT with an ST7735 driver chip (for example, one from AZ-Delivery)
  • DHT11

The connections in the setup are shown in the following Fritzing diagram:

Figure 3.7 – Fritzing diagram for the TFT example

The TFT display uses a Serial Peripheral Interface (SPI) bus to communicate with an MCU. The purpose is the...