Sound and Noise Sensor Module (Microphone Sensor) KY-037 / FC-04 3-pin for Arduino, ESP32 and STM32

A sensitive sound detection module for automation systems, smart home and robotics projects based on Arduino. Adjustable trigger threshold: Sensitivity is set with the blue trimmer potentiometer, allowing the module to be tuned to react to a specific noise level (for example, switching on a light with a hand clap). Simple connection (3-Pin): Equipped with basic power pins and a single digital output (OUT), without overloading the microcontroller's ports. Clear indication: LEDs on the board show the presence of power and the moment the sound signal threshold is exceeded. Features Sensor type — Electret microphone with LM393 comparator Number of contacts — 3 pin (VCC, GND, OUT) Output signal — Digital (Digital Output — DO) Sensitivity adjustment — Built-in multi-turn trimmer potentiometer Supply voltage (VCC) — 3.3 V – 5.0 V DC Indication — Power LED (PWR) and threshold trigger LED (OUT-LED) Comparator chip — Precision LM393 chip Board dimensions — ~32 × 17 mm