This book is intended for all of the people who are passionate about innovation. It contains 500 exciting projects that have a detailed functional description and electronic circuits. The target audience for this book is engineering students and electronics hobbyists. It is a massive library of ideas for unique projects and fresh creations. This handbook is for people who want to do creative projects using open-source tools and methods. It has a lot of ideas for how to do creative projects and make something new for society. This book is divided into six chapters, beginning with basic electronic components and progressing to an introduction to Arduino sensors and boards, esp8266 NodeMCU, esp32, and Raspberry Pi. 300 electronic project ideas with tested circuits are included in the second chapter. The third chapter has 100+ Arduino projects. In the fourth chapter, there are 100 fascinating projects for esp8266 NodeMCU, esp32, and finally troubleshooting electronic components. Additionally, it contains operational fundamentals for open-source electronics, allowing college students, schoolchildren, and hobbyists to study electronics through useful schematic diagrams at all levels from beginner to expert. I hope that students and researchers will find this project book valuable for their mini-projects and an outstanding project guide for science fair projects and new inventive endeavors.