#include <Servo.h>
int trigpin = 6;
int echopin = 7;
unsigned int duration;
unsigned int distance;
Servo servo1;

void setup() {
  pinMode(trigpin, OUTPUT);
  pinMode(echopin, INPUT);
  servo1.attach (8);

}

void loop() {
  digitalWrite(trigpin, LOW);
  delay(2);
  digitalWrite(trigpin, HIGH);
  delay(10);
  digitalWrite(trigpin, LOW);
  duration = pulseIn(echopin, HIGH);
distance = (duration /2)/ 28.5;

if (distance <10) {
 servo1.write(0);
 delay(3);
 servo1.write(90);
 delay(3000);
 servo1.write(0);
 delay(1000);
 } 
}