High Sensitivity Sound Microphone Sensor Detection Module KY-037

High Sensitivity Sound Microphone Sensor Detection Module KY-037

Sensors
DET587
Part.No: KY-037
€2.25
Last items in stock
Immediate Dispatch
KY-037 High Sensitivity Sound Microphone Sensor Detection Module with dual analog/digital output, 5V DC supply, and onboard comparator — ideal for Arduino sound detection projects.

 

The KY-037 (OEM) is a high-sensitivity sound microphone sensor detection module designed for Arduino-based sound detection and noise-triggered automation projects. Operating on a 5V DC supply, it provides two output modes — analog (AO) and digital (DO) — giving makers full flexibility whether they need precise audio level readings or simple threshold-based triggering. Its onboard comparator and potentiometer make it one of the most beginner-friendly audio sensor modules for microcontroller platforms.

Key Features

  • Dual Output (AO + DO): Analog output delivers a real-time voltage signal proportional to sound intensity → enables precise audio monitoring; Digital output fires high/low when sound crosses a set threshold → perfect for event-triggered logic
  • High-Sensitivity Microphone: Picks up faint sounds clearly → reliable detection even in quiet environments
  • Onboard Comparator with Threshold Adjust: Built-in potentiometer lets you fine-tune the trigger sensitivity → no extra components needed
  • Power Indicator LED: Lights up when the module is powered → instant visual confirmation of correct wiring
  • Comparator Output LED: Illuminates when the digital threshold is reached → great for debugging without a multimeter
  • 3mm Mounting Screw Hole: Integrated mounting hole → easy, secure enclosure installation
  • 5V DC Power Supply: Standard Arduino-compatible voltage → plug directly into Arduino 5V pin with no level shifting

Pinout & Wiring

PINSymbolDescription
1VCCPower supply — connect to 5V
2GNDGround
3DODigital output — HIGH/LOW based on sound threshold
4AOAnalog output — real-time voltage proportional to sound level

Wiring note: Connect VCC → 5V, GND → GND, DO → any Arduino digital pin (e.g. D3), AO → any Arduino analog pin (e.g. A0). Adjust the onboard potentiometer to set the desired digital trigger threshold.

Compatibility

  • Arduino UNO / Nano / Mega: Fully compatible — 5V supply and 5V logic match directly; use digital pin for DO and analog pin for AO.
  • Raspberry Pi (via ADC): 5V supply supported; AO requires an external ADC (e.g. MCP3008) since Raspberry Pi has no native analog inputs. DO can connect to a GPIO pin with a 3.3V logic-level shifter.

Typical Applications

  • Clap-activated switches: Trigger a relay or LED strip with a clap — classic beginner Arduino project using the DO pin.
  • Sound level monitoring: Read the AO pin to log noise levels in a room or workshop over time.
  • Voice-activated alarms: Detect loud sounds and trigger a buzzer or notification in security setups.
  • Smart home automation: Integrate with ESP8266/ESP32 (via 5V rail) to send MQTT events on sound detection.
  • Robotics: Give your Arduino robot the ability to respond to audio cues or environmental noise.

Technical Specifications

ParameterValue
InterfaceAnalog (AO) + Digital (DO)
Operating Voltage5V DC
Digital OutputHigh / Low (threshold-based)
Analog OutputReal-time voltage signal
Threshold AdjustmentOnboard potentiometer
Mounting Hole3mm screw hole
Indicator LEDsPower LED + Comparator output LED
MPNKY-037

FAQ

Q: What is the difference between the AO and DO outputs on the KY-037?
A: The AO (analog output) provides a continuous voltage signal that varies with sound intensity — useful for measuring sound levels. The DO (digital output) switches between HIGH and LOW only when the sound exceeds the threshold set by the onboard potentiometer — useful for simple on/off triggering.

Q: Can I use the KY-037 with an ESP32 or ESP8266?
A: The module requires 5V power, which both boards can supply via their VIN/5V pin. However, since ESP32/ESP8266 GPIO pins are 3.3V logic, connect DO through a logic-level shifter to protect the GPIO. The AO pin can connect to the ESP32's ADC input directly only if your board provides a 3.3V-compatible analog signal range — verify the actual output voltage range before connecting.

Package Contents: 1× KY-037 Sound Sensor Module

⚠ Note: ESP32 and Raspberry Pi GPIO pins operate at 3.3V logic. When connecting the DO output to a 3.3V platform, use a logic-level shifter to avoid damaging the GPIO pins.
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