HC-SR04 reverse engineer code1 Har.Sh

#define trigPin 3
#define echoPin 2

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

void loop(){
 int duration, distance;
 digitalWrite(trigPin, HIGH);
 delayMicroseconds(1000);
 digitalWrite(trigPin, LOW);
 duration = pulseIn(echoPin, HIGH);
 distance = (duration / 2) / 29.1;
 Serial.print(distance);
 Serial.println(" cm");

//

 int thisPitch = map(distance, 0, 200, 2093, 22);
 int standardPitch = 1500;

 // noteList

int noteC0 = 262;
int noteC0sharp = 278;
int noteD0 = 294;
int noteD0sharp = 312;
int noteE0 = 330;
int noteF0 = 349;
int noteF0sharp = 370.5;
int noteG0 = 392;
int noteG0sharp = 416;
int noteA1 = 440;
int noteA1sharp = 467;
int noteB1 = 494;
int noteC1 = 523;
int noteC1sharp = 555;
int noteD1 = 587;
int noteD1sharp = 623;
int noteE1 = 659;
int noteF1 = 698;
int noteF1sharp = 741;
int noteG1 = 784;
int noteG1sharp = 832;
int noteA2 = 880;
int noteA2sharp = 934;
int noteB2 = 988;
int noteC2 = 1047;

//----------------
//settings here
 int firstPitch = 1500;
 int secondPitch = 1000;

 int resetPitch = 500;
 int beepCount = 0;

 if (distance > 8 && beepCount <= 3)
{
  //tune here:-
  tone(4, noteE0); //1
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //2
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //3
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //4
  delay(100);
  noTone(4);
  delay(100);
   tone(4, noteF0); //5
  delay(300);
  noTone(4);
  delay(100);

  tone(4, noteF0); //6
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //7
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //8
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //9
  delay(150);
  noTone(4);
  delay(50);
  tone(4, noteF0); //10 half note #1
  delay(50);
  noTone(4);
  delay(50);
  tone(4, noteF0); //11 half note #2
  delay(50);
  noTone(4);
  delay(50);
  tone(4, noteF0); //12
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //13
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteD0sharp); //14
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteE0); //15
  delay(100);
  noTone(4);
  delay(100);
  tone(4, noteF0); //16
  delay(100);
  noTone(4);
  delay(300);

  //beepCount = beepCount + 1;
}
/* if (distance < 2 && beepCount <= 3)
{
  tone(4, resetPitch);
  beepCount = 0;
}
*/


 noTone(4);
 delay(1);
}