I put a computer in a book

An embedded systems engineer builds a computer inside a book to practically demonstrate what an embedded system is. The project walks through the full development process: defining inputs (button, light sensor) and outputs (LED strip, e-ink display), writing firmware in C, designing a custom PCB after frying the prototype, and physically fitting everything into a hollowed-out book. Along the way, key concepts are explained: embedded systems are computers shaped for a specific purpose, distinct from general-purpose computers (which lack a fixed role) and simple electrical devices (which lack a computer entirely). The engineering process covers blinking LEDs, PWM, ADC readings, using third-party display libraries, schematic drawing, PCB layout, and hardware debugging.