Arduino: How to use KY-038 Sound Sensor Module

				
					const int DIGITAL_PIN = 7; // D0 Output
const int ANALOG_PIN = A0; // A0 Output
const int LED_PIN = 13;    // Built-in LED

// Variables for filtering the analog reading
int maxVolume = 0; // Tracks the peak volume since the last reading

void setup() {
  pinMode(LED_PIN, OUTPUT);
  pinMode(DIGITAL_PIN, INPUT);
  Serial.begin(9600);
  Serial.println("KY-038 Sound Sensor Ready!");
}

void loop() {
  // 1. Analog Reading (A0) - Read 100 samples to find the peak volume
  // This helps to smooth the fluctuating waveform into a single 'loudness' value.
  maxVolume = 0;
  for(int i = 0; i < 100; i++) {
    int raw = analogRead(ANALOG_PIN);
    if (raw > maxVolume) {
      maxVolume = raw;
    }
  }

  // 2. Read Digital State (D0) - Active LOW typically means noise detected
  int digitalState = digitalRead(DIGITAL_PIN);

  // Control LED based on Digital Output
  if (digitalState == LOW) {
    digitalWrite(LED_PIN, HIGH); // Turn LED ON (Sound Detected)
  } else {
    digitalWrite(LED_PIN, LOW);  // Turn LED OFF (Quiet)
  }

  // Print both outputs to the Serial Monitor
  Serial.print("Analog (Peak Volume): ");
  Serial.print(maxVolume);
  Serial.print(" | Digital (Switch): ");
 
  if (digitalState == LOW) {
    Serial.println("DETECTED (LOW)");
  } else {
    Serial.println("CLEAR (HIGH)");
  }
 
  delay(100);
}