This undergraduate textbook first introduces basic electronic circuitry before explaining more advanced elements such as the Arithmetic Logic Unit, sequential circuits, and finally microprocessors. In keeping with this integrated and graduated approach, the authors then explain the relationship to first assembly programming, then higher-level languages, and finally computer organisation. Authors use the Raspberry Pi and ARM microprocessors for their explanations The material has been extensively class tested at TU Eindhoven by an experienced team of lecturers and researchers. This is a modern, holistic treatment of well-established topics, valuable for undergraduate students of computer science and electronics engineering and for self-study. The authors use the Raspberry Pi and ARM microprocessors for their explanations.