#include "Arduino.h"
#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"
#include <Servo.h>

SoftwareSerial mySoftwareSerial(4, 3); // RX, TX
DFRobotDFPlayerMini myDFPlayer;
void printDetail(uint8_t type, int value);

#define echoPin 11
#define trigPin 12
//#define buzzer 8

long duration;
int distance;
Servo servo;

void setup() {

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  Serial.begin(9600);
  mySoftwareSerial.begin(9600);
  servo.attach(9);
  if (!myDFPlayer.begin(mySoftwareSerial)) {
    Serial.println(F("Unable to begin:"));
    Serial.println(F("1.Please recheck the connection!"));
    Serial.println(F("2.Please insert the SD card!"));
    while (true) {
      delay(0);
    }
  }
  Serial.println(F("DFPlayer Mini online."));

  myDFPlayer.volume(30);  //Set volume value. From 0 to 30
}

void loop() {

  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  if (distance < 10) {
    Serial.println("the distance is less than 10");
    servo.write(90);
    myDFPlayer.play(1);
    delay(4000);
    myDFPlayer.stop();
  }
  else {
    servo.write(0);
  }
  if (distance > 60 || distance <= 0) {
    Serial.println("the distance is more than 60");
  }
  else {
    Serial.print(distance);
    Serial.println(" cm");
  }
  delay(500);
}