Microphone Voice Sound Sensor Module KY-038

Microphone Voice Sound Sensor Module KY-038

Sensors
DET588
Part.No: KY-038
€2.25
In Stock
Immediate Dispatch
KY-038 Microphone Voice Sound Sensor Module with ECM sensor, analog (AO) and digital (DO) outputs, and adjustable sensitivity via onboard potentiometer. Ideal for Arduino sound-detection projects.

 

The KY-038 Microphone Voice Sound Sensor Module (MPN: KY-038) is a compact, easy-to-use sound detection module built around a high-sensitivity electret condenser microphone (ECM). It provides both an analog output (AO) for real-time sound level readings and a digital output (DO) for simple threshold-based detection, making it one of the most popular modules for Arduino-based sound-sensing applications.

Key Features

  • High-Sensitivity ECM Sensor: Detects a wide range of sound levels with precision → reliable sound triggering even in quiet environments
  • Power Indicator LED: Onboard LED lights up when the module is powered → instant visual confirmation of correct wiring
  • Comparator Output LED: Second onboard LED indicates when the digital output is triggered → easy threshold debugging without a microcontroller
  • Analog Output (AO): Real-time microphone voltage signal → read raw sound levels via ADC for audio envelope detection
  • Digital Output (DO): High/Low signal based on comparator threshold → direct GPIO-compatible output for simple clap or noise detection
  • Adjustable Sensitivity: Onboard potentiometer for threshold tuning → adapt the module to any acoustic environment without code changes

Pinout & Wiring

PinSymbolDescription
1AOAnalog Output – real-time microphone voltage signal
2GNDGround
3VCCPower Supply (5V)
4DODigital Output – High/Low comparator signal

Wiring note: Connect VCC to 5V, GND to GND, DO to any digital pin for clap detection, and AO to an analog pin (A0–A5) if you need continuous sound level monitoring.

Compatibility

  • Arduino UNO / Nano / Mega: Fully compatible — the module operates at 5V and the DO output connects directly to any digital GPIO pin; AO connects to any ADC-capable analog pin.
  • Raspberry Pi / ESP32 (3.3V logic): Use a logic-level shifter or voltage divider on the AO line, as these boards use 3.3V ADC inputs.

Typical Applications

  • Clap-activated switches: Turn lights or devices on/off with a clap — the DO output handles this with zero extra components.
  • Sound-level monitoring: Log ambient noise over time using the AO output and an Arduino ADC for classroom or workshop projects.
  • Voice-activated triggers: Wake up a microcontroller from sleep mode when a sound threshold is exceeded.
  • Security & alarm systems: Detect glass-break or loud impact sounds as part of a DIY alarm.
  • Interactive robotics: Let a robot respond to hand claps or voice commands in maker and STEM education projects.

Technical Specifications

InterfaceAnalog (AO) + Digital (DO)
Operating Voltage5V DC
Output TypeAnalog voltage signal (AO) / Digital High-Low (DO)
Sensitivity AdjustmentOnboard potentiometer
Microphone TypeElectret Condenser Microphone (ECM)
IndicatorsPower LED + Comparator output LED
MPNKY-038

FAQ

Q: What is the difference between AO and DO on the KY-038?
A: AO (Analog Output) provides a continuous voltage that rises and falls with sound level — ideal for measuring sound intensity. DO (Digital Output) switches between HIGH and LOW based on a fixed threshold set by the potentiometer — ideal for simple event detection like clapping.

Q: Can I use the KY-038 with an ESP32?
A: The module runs on 5V, but the AO signal may exceed the 3.3V ADC limit of an ESP32. Use a voltage divider on the AO line. The DO output is typically safe to connect directly to an ESP32 GPIO when powered at 5V, but verify signal levels with a multimeter first.

Package Contents: 1 × KY-038 Sound Sensor Module

⚠ Note: The analog output voltage is referenced to the module's VCC. When using with 3.3V microcontrollers (ESP32, Raspberry Pi), protect ADC inputs from overvoltage using a voltage divider.
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