KY-038 Microphone sound sensor

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// Declaration and initialization of the input pins
int analog_input = A0; // Analog output of the sensor
int digital_input = 3; // Digital output of the sensor
  
void setup () {
  pinMode(analog_input, INPUT);
  pinMode(digital_input, INPUT);
  Serial.begin(9600); // Serial output with 9600 bps
  Serial.println("KY-038 Noise detection");
}
  
// The program reads the current values of the input pins
// and prints them to the serial output
void loop () {
  float analog_value;
  int digital_value;
    
  // Current values are read out, converted to the voltage value...
  analog_value = analogRead(analog_input) * (5.0 / 1023.0); 
  digital_value = digitalRead(digital_input);
    
  //... and printed at this point
  Serial.print("Analog voltage value: "); 
  Serial.print(analog_value, 4);
  Serial.print(" V, \t Threshold value: ");
  
  if (digital_value == 1) {
      Serial.println("reached");
  }
  else {
      Serial.println("not yet reached");
  }
  Serial.println("----------------------------------------------------------------");
  delay(1000);
}

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