#include <Servo.h>
#define trigPin 6
#define echoPin 2

Servo servo;
int sound = 250;

void setup () {
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  servo.attach(5);
}

void loop () {
  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 < 10) {
    Serial.println("the distance is less then 5");
    servo.write(90);
  }
  else {
    servo.write(0);
  }
}