This book can be used to be one of the references for related courses such as the Internet of Things (IoT) course. In addition, it can be used to enrich the reading characteristics of students who will take a final project on IoT or researchers who study theoretically or practically IoT topics.This book discusses the implementation of multi-functional IoT technology in the form of intelligent handwashing technology tool that have many features. The advantages of this tool are able to intelligently act as an automatic hand-washer, automatic temperature detector, automatic saturation detector,...