Chapter 1, IoT with ESP32 using Arduino IDE, begins with an introduction to IoT, outlining its characteristics and various applications. Following that, the ESP32 is introduced, and its capabilities are explored in detail. The chapter concludes by explaining and utilizing the Arduino IDE for a “Hello World” example.

Chapter 2, Connecting Sensors and Actuators with ESP32, provides an overview of the ESP32’s General Purpose Input/Output (GPIO) and peripherals. The chapter also explores communication protocols used to connect different sensors, including examples of UART, I2C, and SPI.

Chapter 3, Interfacing Cameras and Displays with ESP32, offers both theoretical insights and practical guidance on utilizing the ESP32-CAM board, along with various display modules in conjunction with the ESP32.

Chapter 4, Implementing Network-Based Protocols with ESP32, provides an overview of network-based protocols such as Wi-Fi, Bluetooth Low Energy (BLE), Cellular (5G and NB-IoT), and LoRaWAN. The chapter also explores the distinctions between these protocols, offering insights to help you select the most suitable network protocol for your upcoming projects.

Chapter 5, Choosing the Right Data-Based Protocols for Your ESP32 Project, explores various data-based protocols such as HTTP, MQTT, and webhooks. The chapter outlines the differences between these protocols, aiding you in selecting the most appropriate data-based protocol for your ESP32 projects.

Chapter 6, Project 1 – Smart Plant Monitoring System Using ESP32, Messaging Services, and the Twitter API, offers a step-by-step guide to reading environmental parameters such as temperature, humidity, and soil moisture using ESP32. Additionally, the chapter covers how to share these status updates on Twitter, Email, WhatsApp, and Telegram using ESP32.

Chapter 7, Project 2 – Rent Out Your Parking Space, provides a step-by-step guide to creating a prototype system. This system enables you to accept payments via PayPal to rent out your parking space.

Chapter 8, Project 3 – Logging, Monitoring, and Controlling Using ESP32, outlines a step-by-step approach to reading data from various sensors in different locations within a house, such as the kitchen and bedroom, using ESP32. Moreover, the chapter covers how to log this data in a database, visualize and monitor it, and control components using your smartphone.

Chapter 9, From Arduino IDE to Advanced IoT Development – Taking the Next Steps, offers a roadmap to advance your IoT development skills and suggests the next steps you can take to build on the knowledge gained from this book.