#include "pitches.h"

int SPEAKER_PIN = 13;               
int PIR = 2;               
int pirState = LOW;
int val = 0;


void setup() {
  pinMode (SPEAKER_PIN, OUTPUT);
  pinMode(PIR, INPUT);
  Serial.begin(9600);
}

void loop() {
  val = digitalRead(PIR);
  if (val == HIGH) {
   Alarm();
    if (pirState == LOW) {
      // we have just turned on
      Serial.println("Motion detected!");
      // We only want to print on the output change, not state
      pirState = HIGH;      
    }
  } else {   
    if (pirState == HIGH) {
      // we have just turned of
      Serial.println("Motion ended!");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}

void Alarm() {
  tone(SPEAKER_PIN, NOTE_D8);
  delay(120);
  tone(SPEAKER_PIN, NOTE_B6);
  delay(120);
  noTone(SPEAKER_PIN);
}