#define TRIG_PIN 18 
#define ECHO_PIN 5 
#define LED 2
#define LED2 4
float duration_us, distance_cm;
int pirdata =15 ;       
int pirstate =LOW ;     
int value =0;  
int led1 = 13;         


void setup() {
  Serial.begin (9600);
  pinMode(led1, OUTPUT);
  pinMode(pirdata, INPUT);    
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(LED, OUTPUT);
  pinMode(LED2, OUTPUT);
}

void loop() {
  value = digitalRead(pirdata);  

  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration_us = pulseIn(ECHO_PIN, HIGH);
  pir();

  distance_cm = 0.017 * duration_us;

  if (distance_cm < 30) 
  {digitalWrite(LED, HIGH);
  }
  else
  {digitalWrite(LED, LOW);
  }
 
  Serial.print("distanceA: ");
  Serial.print(distance_cm);
  Serial.println(" cm      ");
  Blink(LED2);
  delay(500);
}


void Blink(int x){
  digitalWrite(x, HIGH);
  delay(10);
  digitalWrite(x, LOW);
}

void pir() {
  value = digitalRead(pirdata);  
  if (value == HIGH) {           
    digitalWrite(led1, HIGH);  
    
    if (pirstate == LOW) {
     
      Serial.println("Motion detected!");
      
      pirstate = HIGH;
    }
  } else {
    digitalWrite(led1, LOW);
    
    if (pirstate == HIGH) {
      
      Serial.println("Motion ended!");
     
      pirstate = LOW;
    }
  }
    delay(500);

}