DIY Polygraph Engineering: Build and Analyze a Lie Detector

Have you ever wondered how a lie detector actually works and whether it truly detects deception? The polygraph is not a magical mind-reader, but a scientific instrument that measures physiological responses to stress. In this course, you will discover the foundational science of biometrics and learn the step-by-step engineering principles behind building your own functional polygraph simulator using accessible electronic components.\n\nWhat you will learn:\n- Understand the core physiological markers of stress, including galvanic skin response and heart rate.\n- Explore the history, science, and limitations of traditional lie detection technologies.\n- Design a basic sensor circuit to capture real-time biometric data from the human body.\n- Program a microcontroller to read, process, and calibrate analog sensor signals.\n- Analyze physiological data patterns using basic logical thresholds to detect stress responses.\n- Learn how modern biometrics and digital signal processing are updating threat detection.\n\nWe start with key biological terminology and foundational definitions before guiding you through hardware schematics and code logic. This course is designed for curious beginners and hobbyists with no prior experience in electronics. Start reading today to unlock the secrets of biometric engineering!