Based on the Blynk IoT platform, this book guides readers to create IoT projects through the project practice, the hardware in this book is a customized ESP8266 learning development board. This book first introduces some concepts of the Internet of Things, and introduces the method of constructing the Internet of Things development environment based on the understanding of the Internet of Things development board. Then, through the implementation of remote console lights, timing fans and other primary projects, the reader is guided to use the mobile phone and hardware to send simple commands, remote control, remote data acquisition and other mission. By reading this book, readers can master the knowledge of Blynk IoT development technology, understand the development principles and steps of the Internet of Things, and independently develop IoT projects.