The Knock Sensor Module detects vibrations or knocks and provides a digital output, making it ideal for security systems, interactive devices, and smart automation. It senses impact through voltage level changes, allowing easy integration with Arduino, Raspberry Pi, ESP32, and other microcontrollers. With high sensitivity and immediate response, this module is perfect for DIY electronics, touchless switches, alarms, and motion-based controls, offering a reliable solution for vibration-based applications.