The book Mechatronics is a comprehensive exploration of the interdisciplinary field that integrates mechanical, electronic, computer, and control engineering. Written by a team of seasoned academic professionals, the book is tailored for engineering students and professionals seeking a clear understanding of how modern systems are designed using a synergistic approach. Beginning with an introduction to mechatronic systems, the book elaborates on fundamental components like sensors, transducers, and actuators. It explains system modeling, feedback mechanisms, and measurement systems essential for effective control and automation. Core content includes in-depth discussions on microprocessors and microcontrollers, particularly the 8085 and 8051 architectures. Concepts like instruction sets, timing diagrams, and interfacing with external devices are presented with practical clarity to support embedded system development. A major strength of this book is its coverage of the Programmable Peripheral Interface (PPI), with detailed insights into the 8255 chip. Students learn how to interface with keyboards, displays, ADC/DAC converters, stepper motors, and sensors, bridging theoretical learning with real-world applications. Further enriching the content, the book introduces the architecture, operation, and programming of Programmable Logic Controllers (PLCs). Ladder logic, input/output modules, PLC programming techniques, and comparative studies with computer systems are presented for industrial automation learners. The final units are devoted to actuators and system design, exploring the classification and application of stepper motors, servo motors, and electromechanical components. The design methodology of mechatronic systems is discussed through traditional and modern design paradigms, including case studies such as escalator control. Emphasis is given to the classification and selection of sensors, covering LVDTs, RVDTs, Hall Effect sensors, strain gauges, potentiometers, and capacitive sensors. Each sensor’s working principle, application, and performance parameters are described with diagrams and characteristic curves. Throughout the book, real-life examples and industry applications are used to reinforce learning—ranging from robotics and automotive systems to smart homes, autonomous vehicles, and biomedical devices. The book showcases emerging areas like AI-integrated systems, IoT in mechatronics, and nano-mechatronics. Designed with clarity and pedagogical depth, the book is suitable for undergraduate engineering courses, diploma programs, and interdisciplinary learners. It provides detailed explanations, illustrations, and programming examples to make complex concepts accessible and application-oriented.