In this book, we will work together step-by-step to create five exciting and great projects using the Arduino Uno microcontroller. We will use Autodesk's free Tinkercad software and its block-based programming approach. We will also use sensors in each of the projects, such as a temperature sensor or an ultrasound sensor and many more components. I am an engineer (M.Eng.) and would like to introduce you to the topics of electronics, Arduino, and block-based programming with Tinkercad. I will try to do this in an application-oriented, playful, and simple way using DIY projects. In the first chapters of this book, you will find a short theoretical introduction or a refresher - depending on your level of knowledge - about the Arduino, Tinkercad and electronics in general. In the following chapters, you will find five exciting projects that we will build together step by step. For each project, you'll learn about the components you'll need, how to build the circuit, and how to create the code using block-based programming. No matter what age you are, whether you are still in school, whether you are already an adult, whether you are a student or a retiree, if you are interested in any of these topics, this book is for you! This book is intended for both those who have no knowledge and those who already have some basic knowledge in any of the following areas: Arduino, Tinkercad and Electronics. Take a look inside now and get your copy as an ebook or paperback!