const int trigPin = 9;
const int echoPin= 10:
const int buzzer= 11;
const int ledPin = 13:
// defines variables
long duration;
int distance;
int safetyDistance;

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(ledPin, OUTPUT);
  Serial.begin(9600);
}

 void loop() {
   digitalWrite(trigPin, LOW);
   delayMicroseconds(2);

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

   duration = pulseIn(echoPin,HIGH)
   distance = duration*0.034/2;

   safteyDistance = distance;
   if (safteyDistance <= 5){
     digitalWrite(buzzer, HIGH);
     digitalWrite(ledPin, HIGH);
   }
   else{
     digitalWrite(buzzer, LOW);
     digitalWrite(ledPin, LOW);
   }
   Serial.print("Distance:");
   Serial.print(distance);
    }