#include <Servo.h>
#define trigPin 5
#define echoPin 6

long duration;
int distance;
Servo s;

void setup()
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  s.attach(3); 
  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.println(distance);
   
  if(distance<100)
    s.write(90);
  else
    s.write(0);
  
   delay(500);
    
}