void setup() {
pinMode(3, OUTPUT);
pinMode(4, OUTPUT);
pinMode(5, OUTPUT);
pinMode(A0, INPUT);
Serial.begin(9600);
}

void loop() {
int value = analogRead(A0);
Serial.print("\n ");
Serial.print(value);
if (value > 910){
  digitalWrite(3, HIGH);
  digitalWrite(4, LOW);
  noTone(A0);
  }
  else
  {
    digitalWrite(3, LOW);
    delay(500);
    digitalWrite(4, HIGH);
    tone(5,256,2);
  }
 }