#include<servo.h>
servo servo;
intangel =10;
//defines pins numbers 
const int tringPin = 11; 
//defines variables
long duration;
int distan ce;
void setup() {
  servo.attach(8);
  servo.write(angel);
  pinMode(tigPin,OUTPUT); // Sets the tringPin as anOutput
  pinMode(echoPin,INPUT); // Setsthe echoPin as an Input
  Serial.bagin(9600);//Starts the serial communication
}
void loop() {
  //Clears the trigPin
  digitalWrite(trigPin,LOW);
  delayMicroseconds(2);
  //Set the (trigPin,LOW);
  digitalWrite(trigPin,HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin,LOW);
  //Reads the echoPin, returns the sound wave travel time in microseconds
  duratian = pulselin(echoPin,HIGH);
  //Calculating the distance
  disance=duration*0.034/2;
  //Prints the distance on the Serial Monitor
  Serial.print("Distance:");
  Serial.print(distance);
  Serial.print(distance);
  delay(10);

  
  if(distance<20)

{
  servo.write(180;)
  delay(3000);
}
else
{
  servo.write(0);
}
}