#define pinPir 7
#define pinRelay 5
#define trigPin 3
#define echoPin 2
int PirState = LOW;
int val = 0;

float X=400/397.63;

void setup() {
  Serial.begin (9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pinPir, INPUT);
  pinMode(pinRelay, OUTPUT);

}

void loop() {
  long duration, distance;
  val = digitalRead(pinPir);
  
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2); 
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); 
  digitalWrite(trigPin, LOW);
  
  duration = pulseIn(echoPin, HIGH);
  distance = (duration/2) / 29.1;
  Serial.print(distance);
  Serial.println(" cm");

  if(val == HIGH){
     if (PirState == LOW && distance <= 100){
      Serial.println("Awas Ada Maling!");
      PirState = HIGH;
        for(int i=0; i<5; i++){
        digitalWrite(pinRelay, HIGH);
        delay(1000);
        digitalWrite(pinRelay, LOW);
        delay(1000);
        }

     }
  } else{
    digitalWrite(pinRelay, LOW);
    if(PirState == HIGH){
      Serial.println("Tidak ada Gerakan!");
      PirState = LOW;
    }
  }
  delay(500);
}