int sensorPin = A0;
int buzzerPin = 7;
int sensorValue = 0;

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

void loop() {

  sensorValue = analogRead(sensorPin);
  Serial.println(sensorValue);

  if (sensorValue > 500) {
    digitalWrite(buzzerPin, HIGH);
  }
  else {
    digitalWrite(buzzerPin, LOW);
  }

  delay(100);
}