The KY-038 is a compact and cost-effective microphone sound sensor module designed for sound detection applications with microcontrollers such as Arduino. It features an electric condenser microphone and an LM393 comparator chip, making it suitable for a variety of basic audio-detection projects.

The module can detect sound intensity and provide both analog and digital outputs. The analog output reflects the real-time sound level, while the digital output can be used to trigger actions when the sound exceeds a certain threshold, making it ideal for use in sound-activated systems such as alarms, lights, or monitoring devices.

Features:

• Equipped with LM393 comparator chip for digital signal processing

• Electric condenser microphone for sound detection

• Provides both analog (AO) and digital (DO) outputs

• Adjustable sensitivity via onboard potentiometer

• Dual LED indicators:

  • Power LED: Indicates module is powered

  • Sensor LED: Activates when detected sound exceeds set threshold

• Suitable for sound-activated applications and DIY electronics

Specifications:

• Model: KY-038

• Working Voltage: 4–6V DC

• Input Voltage Range (VCC): 3V–24V

• Analog Output (AO): Variable voltage based on sound level

• Digital Output (DO): High/Low based on sound threshold (set via potentiometer)

• LED Indicators:

  • Power LED (Red)

  • Sensor LED (Red - lights up when sound threshold is met)

Wiring:

• AO: Analog output

• DO: Digital output (comparator result)

• GND: Ground

• VCC: Power input