#include <Servo.h>

Servo servoMotor;

const int trigPin = 12;
const int echoPin = 6;

long duration;
int distance;

void setup(){
  pinMode(trigPin,OUTPUT);
  pinMode(echoPin,INPUT);
  servoMotor.attach(4);
  servoMotor.write(0);
  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;
  Serial.print("Distance:");
  Serial.print(distance);
  Serial.println("cm");
  if(distance<=75){
    servoMotor.write(180);
  }
  else{
    servoMotor.write(0);
  
  }
  delay (500);
  }