int sensorPin = 0;    //Microphone Sensor Pin on analog 0
int ledPin = 13;
int sensorValue = A0;

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

void loop() {
  // read the value from the sensor:
  sensorValue = analogRead(sensorPin);

  Serial.println(sensorValue);
  delay(0);

  if (sensorValue > 670) {
    // turn LED on:
digitalWrite(ledPin, HIGH);
delay(50);
        digitalWrite(ledPin, LOW);
  }
  else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
  }
}