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

Implementation

Let's discuss the hardware first. The following Fritzing diagram shows the connections between ESP32 and other hardware components:

Figure 5.2 – Fritzing diagram of the project

The interesting point here is the Inter-Integrated Circuit (I2C) connections. I2C is a bus, so we can connect multiple devices on the same bus, as long as they have different bus addresses. Therefore, we connect BME280 and TSL2561 to the same pins of ESP32, GPIO21 and GPIO22. The OLED screen is also an I2C device, but its driver uses the second I2C channel of ESP32, so it is a good idea to connect the OLED screen to other GPIO pins to avoid any configuration conflicts.

Before delving into the code, we need to update the configuration files. Let's start with platformio.ini, as follows:

[env:az-delivery-devkit-v4]
platform = espressif32
board = az-delivery-devkit-v4
framework = espidf
monitor_speed = 115200
lib_extra_dirs =
   ...