#include <Servo.h>
int trig = 3;
int echo = 6;
int distance;
int time;
 Servo angle;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  angle.attach(5);
  angle.write(0);
}

void loop() {
  // put your main code here, to run repeatedly:
  int a = distance;
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  time = pulseIn(echo, HIGH);
  distance=time*0.034/2;
if(a<100)
{
  angle.write(90);
  delay(1000);
}
else
{
  angle.write(0);
  delay(1000);
}


}