#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Servo.h>

Servo myservo;

#define buzzer 8
#define  PIN_TRIG 4 
#define  PIN_ECHO 2

int pos = 0;


void setup() 
{
 myservo.attach(9);
}

void loop() 
{
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  int duration = pulseIn( PIN_ECHO, HIGH);
  delay(2000);

  if (duration<=300)
    {
      tone(8,2000,100);
      myservo.write(180);
      delay(10000);
      tone(8,2000,100);
      delay(200);
      tone(8,2000,100);
      myservo.write(90);
      delay(3000);
    } 
 
}