The purpose of this e-book is to guide the audience from basic usage of Scilab and its simulation engine Xcos, to prototyping on an Arduino board. Since my research interests are in control systems area, the focus is on control analysis, design, simulation, and then implementation on a target board. Some materials are already scattered around my website scilab.ninja, while others, such as most topics on Arduino, are entirely new. To be readable as a book, all contents have to be wrapped to a cohesive story that can serve as classroom supplement. I actually use this book to accompany my engineering teaching at Kasetsart university.