This book is a comprehensive guide to mastering hardware protocols with ESP32 and Arduinos. It covers everything from the basics of UART, SPI, and I2C to more advanced topics such as non-standard protocols and troubleshooting. This part of the book covers non-standard protocols, such as the DHT11 and DHT22 sensors. It includes chapters on: DHT11 and DHT22 sensor basics, Using the DHT11 and DHT22 sensors with ESP32 and Arduino. Example projects using the DHT11 and DHT22 sensors, Non-standard protocols are protocols that are not widely used. They are often developed by specific manufacturers for their own devices. This part of the book will teach you how to use non-standard protocols with ESP32 and Arduino devices. The book includes code examples, schematics, and diagrams to help you learn the concepts and build your own projects. It is ideal for readers who have some experience with programming and electronics, but no prior experience with hardware protocols. By the end of this book, you will be able to: Master the basics of UART, SPI, and I2C, Use UART, SPI, and I2C with ESP32 and Arduinos, Work with non-standard protocols such as the DHT11 and DHT22 sensors.