Just as the Internet has changed our daily life in the last century, the revolution of the integration of physical objects in the network of networks is underway. And there is no media today that does not mention the Internet of Things (IoT), which is the interconnection between the Internet and objects, places and physical environments. The term refers to a growing number of objects connected to the Internet, allowing communication between our so-called physical assets and their digital existence.Indeed, this booklet cannot be an exhaustive catalog of the solutions available for IoT (there are already several publications of this type). We just give a clear philosophy for the understanding of the Internet of Things through the Arduino board integrating a microcontroller and an embedded system programmable via a simple USB cable connected to a computer.