#include<Servo.h>
#define trigPin 9
#define echoPin 8
Servo servo;
int sound =250;
void setup() {
  // put your setup code here, to run once:
Serial.begin(9600);
pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
servo.attach(6);

}

void loop() {
  // put your main code here, to run repeatedly:
long duration, distance;
digitalWrite(trigPin,LOW);
delayMicroseconds(2);
digitalWrite(trigPin,HIGH);
delayMicroseconds(10);
digitalWrite(trigPin,LOW);
duration=pulseIn(echoPin,HIGH);
distance=(duration/2)/29.1; 
if (distance<80){
  Serial.print(distance);
  Serial.println("cm");
  servo.write(90);
}
else if(distance<180){
  Serial.print(distance);
  Serial.println("cm");
  servo.write(90);
}
else{
  Serial.println("The distance is more than 180cm ");
}
delay(500);
}