KY-031 Knocking Sensor

KY-031 Knocking Sensor Module – Product Description The KY-031 Knocking Sensor Module is a compact digital sensor designed to detect knocks, taps, vibrations, and physical impacts. It uses a spring-based switch mechanism that momentarily changes its output state whenever a vibration or knock is detected, making it ideal for projects that require simple impact detection. Operating on 3.3V to 5V, the module is fully compatible with popular microcontroller platforms such as Arduino, ESP32, ESP8266, Raspberry Pi, and other embedded systems. Its digital output allows for easy integration into electronic projects without requiring complex signal processing. Features Detects knocks, taps, and vibrations with high reliability Digital output for simple microcontroller interfacing Operating voltage: 3.3V–5V DC Compact, lightweight, and easy to install Compatible with Arduino, ESP32, ESP8266, Raspberry Pi, and similar development boards Applications Security and intrusion alarm systems Door knock or tap detection Vibration monitoring Interactive electronic projects Smart home automation Educational and robotics projects The KY-031 is an excellent choice for beginners and professionals looking for a simple, low-cost solution for detecting physical impacts and vibration events in embedded systems and DIY electronics projects.