#include <NewPing.h>
#include <Servo.h>
#define trigPin 13
#define echoPin 12
#define MAX_DISTANCE 500
int pinSpeaker = 10;
const int ledPin = 6;

NewPing sonar(trigPin, echoPin, MAX_DISTANCE);

int angle = 0;

Servo servo;

void setup() {
  Serial.begin(115200);
  pinMode(ledPin, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(pinSpeaker, OUTPUT);
  servo.attach(9);
  // put your setup code here, to run once:

}

void loop() {
  int duration, distance, pos = 0, i;
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;
  Serial.print(distance);
  Serial.println("cm");
  if (distance <= 15){
    digitalWrite(ledPin, HIGH);
    for (angle = 0; angle < 180; angle++) {
      servo.write(angle);
      delay(15);
    }
    delay(5000);
  if (distance >= 15);
    digitalWrite(ledPin, LOW);
    for (angle = 180; angle > 0; angle--) {
      servo.write(angle);
      delay(15);
    }
    delay(5000);
  
  }
  
  // put your main code here, to run repeatedly:

}