int buzzer = 5;
int LED = 2;
int pir = 15;
int pirState = LOW;
int val = 0;
int Total = 0;
int Space;
int Number = 0;


void setup() {
  pinMode(LED, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(pir, INPUT);

  Serial.begin(9600);
  Space = Total;
}

void loop() {
  val = digitalRead(pir) == LOW && Number==0;  // read input value
  if (Space>0)  {Number=1;
       // check if the input is HIGH
    tone(buzzer, 100);
    digitalWrite(LED, HIGH);
    delay(100);
    noTone(buzzer);
    digitalWrite(LED, LOW);
    delay(100);

    if (pirState == LOW) {
      // we have just turned on
      Serial.println("ตรวจพบการเคลื่อนไหว");
      // We only want to print on the output change, not state
      pirState = HIGH;
    }
  } else {
    if (pirState == HIGH) {
       digitalWrite(LED, LOW);
      noTone(buzzer); 
      // we have just turned of
      Serial.println("ไม่พบการเคลื่อนไหว");
      // We only want to print on the output change, not state
      pirState = LOW;
    }
  }
}