Product Description

The KY‑037 High Sensitivity Microphone Sensor Module is designed to detect sound levels and sound events in the environment using an electret condenser microphone and adjustable gain amplifier. It outputs both a raw analog signal and a digital trigger signal, making it easy to build projects that respond to claps, knocks, alarms, or other loud noises without designing your own front‑end circuitry.

The onboard potentiometer lets you set a sensitivity threshold for the digital output, while the analog output gives a continuous voltage proportional to the detected sound level (relative rather than calibrated). This makes the KY‑037 a versatile choice for sound‑activated electronics, basic audio‑reactive effects, and interactive installations where relative sound intensity is more important than precise decibel measurements.

Compatibility

• Works with Arduino, ESP32, ESP8266, and similar microcontrollers via:

  • AO (Analog Output) to an analog input pin.

  • DO (Digital Output) to a digital input for threshold‑based detection.

• Accepts 3.3 V to 5 V supply, making it suitable for both 5 V Arduino boards and 3.3 V platforms like ESP32.

• Compatible with Raspberry Pi and other SBCs when reading the digital output or using an ADC for the analog output.

• Fits into common “37‑in‑1” or KY‑series sensor kits, with many existing code examples and tutorials.

• Key Features

  • Electret condenser microphone for capturing environmental sound.

  • High‑sensitivity amplifier with adjustable gain via onboard potentiometer.

  • Analog output (AO) providing a voltage related to sound intensity (relative measurement).

  • Digital output (DO) driven by a comparator; goes high or low when sound crosses a set threshold.

  • Power indicator LED and status LED (for digital trigger) on many variants.

  • Designed for sound detection, not for high‑fidelity audio recording.

  • Compact PCB with 4‑pin header: VCC, GND, AO, DO.

  • Technical Specs (Typical, KY‑037)

    Exact values vary slightly by manufacturer; check your specific module:

    • Model: KY‑037 high‑sensitivity sound sensor.

    • Input Voltage: 3.3 V ~ 5 V.

    • Outputs:

      • AO – analog output (continuous signal from microphone/amplifier).

      • DO – digital output (threshold‑based, from comparator).

    • Components: electret microphone, op‑amp amplifier, comparator, potentiometer for sensitivity, indicator LEDs.

    • Typical Size: ~35 × 15 × 14 mm with mounting hole (3 mm).

    • Sensitivity: adjustable via potentiometer for different noise environments.

    • What’s Included

      • 1 × KY‑037 High Sensitivity Microphone Sound Sensor Module

      • Safety Note

        • This module is intended for sound detection, not precise audio measurement or recording; do not rely on it for calibrated sound‑pressure level (SPL) readings.

        • Avoid exposing the microphone to extreme moisture, dust, or very high sound pressure levels, which can degrade performance over time.

        • When used near high‑voltage or noisy equipment, keep wiring short and consider shielding or filtering to reduce false triggers due to electrical noise.