const int trigPin = 14; 
const int echoPin = 13; 
const int ledPin = 4; 

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

void loop() {
  
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);

  float distance_cm = duration / 58.0;

  Serial.print("Distance: ");
  Serial.print(distance_cm);
  Serial.println(" cm");

  if (distance_cm > 150
  ) {
    // Turn on the LED
    digitalWrite(ledPin, HIGH);
  } else {
    // Turn off the LED
    digitalWrite(ledPin, LOW);
  }
  delay(500);
}