Textbook in PDF format This book is about the Arduino microcontroller and the Arduino concept. The visionary Arduino represented a new innovation in microcontroller hardware in 2005, the concept of open source hardware, making a broad range of computing accessible for all. This book, “Arduino VIII: Portenta Machine Control,” is an accessible primer on industrial control and programmable logic controller concepts for those without a deep instrumentation background. The Portenta Machine Control (PMC) is designed as an industrial control for equipment and machines. It couples a powerful dual processor microcontroller with industrial grade inputs and outputs. It also is equipped with a rich complement of onboard systems. An understanding of basic circuit theory is an appropriate prerequisite for the book. The three main goals for the book are: explore accessible Arduino Portenta Machine Control industrial control products; learn the fundamentals of programming using ladder logic; and explore related sensors and interface concepts. We use multiple examples throughout the book and conclude with an instrumented greenhouse project. The book follows these chapters: Operational Technology and the Arduino Portenta Machine Control Arduino Portenta Machine Control features Connectivity and Communications Input Sensors, Output Actuators, and Interfacing Programming with the Arduino PLC IDE Application: Instrumented Greenhouse Safety Embedded Systems Design Getting Started–Arduino UNO R3 Throughout the book we provide numerous hardware and software examples. A tutorial on safety concepts is readily available in Appendix A and referenced throughout the book. We recommend reading this appendix first (now) and regularly as you progress through the book. Appendix B provides a tutorial on system design concepts and tools. In Appendix C we provide information on how to use the Arduino UNO R3 processor. It is used in several examples