Anti-theft alarm

// constants won't change. They're used here to set pin numbers:
const int buzzer = 9;
const int sensorPin = 10;     // the number of the sensor pin
const int signalPin =  13;      // the number of the signal pin

// variables will change:
int tiltState = 0;         // variable for reading the sensorpin
void setup() {
  // initialize the singnal pin as an output:
  pinMode(signalPin, OUTPUT);
  // initialize the sensor pin as an input:
  pinMode(sensorPin, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  // read the state of the sensorpin:
  tiltState = digitalRead(sensorPin);

  // check if the there is water on the rain sensor. If it is, the signalpin is Low:
  Serial.println(tiltState);
  delay(100); 
  if(tiltState ==HIGH)
  {
    digitalWrite(signalPin,HIGH);
    tone(buzzer, 2000); // Send 2KHz sound signal...
  }

  else
  {
    digitalWrite(signalPin,LOW);
    noTone(buzzer); 
  }
}