Sound Sensor Module KY-038 KY-037 for Arduino – Analog & Digital

$6.98 $7.99

Sound Sensor Detection Module for Arduino, AVR & PIC – KY-038 / KY-037

Add reliable sound detection to your next electronics project with this high-sensitivity microphone voice sound sensor module. Compatible with Arduino, AVR, and PIC microcontrollers, this compact SMD module delivers both analog (AO) and digital (DO) outputs — making it incredibly versatile for alarms, sound-activated lighting, noise monitoring, and more.

Built around the trusted LM393 comparator chip and featuring an electret condenser microphone, it detects ambient sound levels with precision and responds with single-channel signal output. Whether you're a beginner building your first Arduino alarm system or an experienced maker, this module is a plug-and-play solution ready for your breadboard or PCB.

Made in Mainland China.

Key Features

Dual Output: Analog output (AO) provides real-time voltage signal; Digital output (DO) switches HIGH/LOW when sound exceeds a set threshold
LM393 Comparator Chip: Stable, accurate threshold detection with adjustable sensitivity via onboard potentiometer
High-Sensitivity Electret Condenser Microphone: Reliably picks up sound events for trigger-based applications
Wide Voltage Range: Works with DC 4–6V operating input; VCC supply range 3V–24V
LED Indicators: Two red LEDs — one for power status, one that lights when sound is detected
3mm Mounting Hole: Easy and secure installation in enclosures or project panels
Single-Channel Signal Output: Clean, straightforward interface for any microcontroller project
SMD Package: Compact, lightweight form factor ideal for embedded builds

Interface Definition

AO – Analog output (real-time microphone voltage signal)
DO – Digital output (comparator threshold output, HIGH/LOW)
VCC – Power supply input (3V–24V)
GND – Ground

Sample Arduino Code

Digital Output Example

int Led = 13;         // LED interface
int buttonpin = 3;    // D0 sensor interface
int val;

void setup() {
  pinMode(Led, OUTPUT);
  pinMode(buttonpin, INPUT);
}

void loop() {
  val = digitalRead(buttonpin);
  if (val == HIGH) {
    digitalWrite(Led, HIGH);
  } else {
    digitalWrite(Led, LOW);
  }
}

Analog Output Example

int sensorPin = A5;
int ledPin = 13;
int sensorValue = 0;

void setup() {
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  sensorValue = analogRead(sensorPin);
  digitalWrite(ledPin, HIGH);
  delay(sensorValue);
  digitalWrite(ledPin, LOW);
  delay(sensorValue);
  Serial.println(sensorValue, DEC);
}

Specifications

Model: KY-038 / KY-037
Main Chip: LM393
Microphone Type: Electret condenser
Supply Voltage: DC 4–6V (operating); VCC 3V–24V
Package: SMD
Mounting Hole: 3mm
Output Types: Analog + Digital
Origin: Made in Mainland China

What's in the Box

1 × Voice Sound Sensor Module (KY-038 / KY-037)

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Frequently Asked Questions

Q: What is the difference between the KY-038 and KY-037 sound sensor modules?

A: Both the KY-038 and KY-037 are microphone sound sensor modules based on the LM393 comparator chip and deliver analog and digital outputs. The primary difference lies in microphone sensitivity — the KY-037 typically features a larger, higher-sensitivity microphone capsule for picking up quieter sounds, while the KY-038 is designed for general-purpose sound detection. Both are fully compatible with Arduino, AVR, and PIC microcontrollers.

Q: Can I use this sound sensor module with a 3.3V microcontroller like a Raspberry Pi or ESP32?

A: Yes. The VCC power input supports a range of 3V–24V, making it compatible with both 3.3V and 5V systems including ESP32, ESP8266, Raspberry Pi (via GPIO), and standard Arduino boards. Always check your specific board's current limits when wiring the module.

Q: How do I adjust the detection sensitivity of the sound sensor?

A: The module features an onboard potentiometer (trim pot) that you can turn with a small screwdriver to raise or lower the sound threshold. Rotating it changes the voltage reference point of the LM393 comparator, so the digital output (DO) triggers at a higher or lower sound level. The analog output (AO) always reflects the raw microphone signal regardless of the threshold setting.