#define PIN_TRIG 5
#define PIN_ECHO 4
#define buzz 1
#define led1 2
#define led2 3
#define NOTE_C3  131
#define NOTE_D3  147
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_G3  196
#define NOTE_A3  220
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_D4  294
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_D5  587
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_G5  784
#define NOTE_A5  880
#define NOTE_B5  988
#define NOTE_C6  1047
int melodyTwinkle[] = {
  NOTE_C4, NOTE_C4, NOTE_G4, NOTE_G4, NOTE_A4, NOTE_A4, NOTE_G4,
  NOTE_F4, NOTE_F4, NOTE_E4, NOTE_E4, NOTE_D4, NOTE_D4, NOTE_C4,
  NOTE_G4, NOTE_G4, NOTE_F4, NOTE_F4, NOTE_E4, NOTE_E4, NOTE_D4,
  NOTE_G4, NOTE_G4, NOTE_F4, NOTE_F4, NOTE_E4, NOTE_E4, NOTE_D4,
  NOTE_C4, NOTE_C4, NOTE_G4, NOTE_G4, NOTE_A4, NOTE_A4, NOTE_G4,
  NOTE_F4, NOTE_F4, NOTE_E4, NOTE_E4, NOTE_D4, NOTE_D4, NOTE_C4
};
int noteDurationsTwinkle[] = {
  4, 4, 4, 4, 4, 4, 2,
  4, 4, 4, 4, 4, 4, 2,
  4, 4, 4, 4, 4, 4, 2,
  4, 4, 4, 4, 4, 4, 2,
  4, 4, 4, 4, 4, 4, 2,
  4, 4, 4, 4, 4, 4, 2
};
void setup() {
  Serial.begin(9600);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(buzz, OUTPUT);
}

void loop() {
  // Start a new measurement:
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  // Read the result:

  int duration = pulseIn(PIN_ECHO, HIGH);
  int cm = duration / 58;
  if (cm < 10 && cm > 0){

    for (int thisNote = 0; thisNote < sizeof(melodyTwinkle) / sizeof(melodyTwinkle[0]); thisNote++) {
    Serial.print("Distance in CM: ");
    Serial.println(duration / 58);
    int noteDuration = 1000 / noteDurationsTwinkle[thisNote];
    tone(buzz, melodyTwinkle[thisNote], noteDuration);
    int pauseBetweenNotes = noteDuration * 1.30;
    delay(pauseBetweenNotes);
    noTone(buzz);
  }
  }
  else{
      Serial.print("Distance in CM: ");
      Serial.println(duration / 58);
      tone (buzz, 400);
      digitalWrite(led1, HIGH);
      digitalWrite(led2, HIGH);
      delay(500);  
      tone(buzz, 500);
      digitalWrite(led1, LOW);
      digitalWrite(led2, LOW);
      delay(500);
  }
  delay(100);
}