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Microphone Sound Detection Module LM393

The LM393 Sound Detection Sensor Module for Arduino is an efficient and easy-to-use module for detecting ambient sound levels that exceed a set threshold. Equipped with a sensitive microphone and an onboard LM393 comparator IC, the module outputs a digital LOW signal and lights up an onboard LED when sound surpasses the threshold. Its adjustable potentiometer allows you to fine-tune the sensitivity for responsive and accurate audio-triggered automation.

Package Includes:

  • 1 x LM393 Microphone Sound Detection Sensor Module

12.00 AED 12.00 AED Tax Included
12.00 AED Tax Included

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Features:

  • Operating Voltage: DC 3.3V - 6V
  • IC Chip: LM393 Dual Comparator
  • Output Type: Digital signal (LOW when sound detected)
  • Adjustable Sensitivity: Onboard potentiometer for fine-tuning threshold
  • Signal Indicator: Onboard LED lights up when sound exceeds setpoint
  • Mounting: Bolt hole for easy attachment to cases or panels
  • Single Channel Output: Processes input from a single microphone

 

Principle of Operation:

  1. Microphone: Detects ambient sound waves and converts them to a weak analog voltage signal.
  2. Amplification: LM393 amplifies the weak signal for comparison.
  3. Threshold Setting: Adjustable potentiometer sets the voltage threshold level.
  4. Comparison: The LM393 compares the signal from the microphone to the threshold value.
  5. Digital Output: If the sound exceeds the threshold, output goes LOW (0V), triggering the LED.

Pinout:

Pinout

Pin Description
GND Connect to microcontroller GND
+5V Power supply input (3.3V to 6V)
OUT Digital output (LOW when sound exceeds threshold)

Applications:

  • Clap-activated switches
  • Voice-controlled systems
  • Animal sound detection
  • Noise monitoring or alarms
  • Interactive sound-reactive installations

Circuit Diagram:

Example wiring to an Arduino UNO:

  • OUT → Pin 2 (Digital Input)
  • VCC → 5V
  • GND → GND
  • LED → Pin 4 (via 220Ω resistor)

Circuit Example

Arduino Code Example:

const int ledPin = 4;
const int microphonePin = 2;
int state = LOW;

void setup() {
  pinMode(ledPin, OUTPUT);
  pinMode(microphonePin, INPUT);
  Serial.begin(9600); // Start serial communication
}

void loop() {
  state = digitalRead(microphonePin);
  Serial.print("Microphone state: ");
  Serial.println(state);

  if (state == HIGH) {
    digitalWrite(ledPin, HIGH);
    Serial.println("LED ON");
    delay(1000);
  } else {
    digitalWrite(ledPin, LOW);
    Serial.println("LED OFF");
  }

  delay(100); // Avoid flooding the serial monitor
}

Technical Specifications:

Parameter Value
Comparator IC LM393
Operating Voltage +3.3V to +6V
Mounting Hole Size 3mm
Dimensions 3.1cm x 1.6cm x 0.8cm
Output Type Digital LOW when triggered
Color Black

Resources:

Comparison with KY-037 Module:

Feature LM393 Module KY-037 Module
Working Voltage 3.3V - 6V 4V - 6V
Comparator Chip LM393 LM393
Output Digital only Digital + Analog
Signal Indicator Yes (LED) Yes (LED)
Size 32mm x 17mm x 15mm 32mm x 14mm x 18mm