#include <Servo.h>
Servo myServo;
const int trigPin = 9;
const int echoPin = 10;
long duration;
long distance;
void setup()
{
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  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 < 30) {
    myServo.attach(6);
    myServo.write(90);
    delay(3000);
    myServo.write(0);
    delay(1000);
    myServo.detach();
  } 
  else 
  {
    myServo.write(0);
  }
  delay(500);
}