#include "pitches.h"
const int ledPin = 27;
const int trigPin = 17;
const int echoPin = 5;
const int buzzerPin = 22;
long duration, distance;

int melody[] = {
  NOTE_C4, NOTE_G3, NOTE_G3, NOTE_A3, NOTE_G3, 0, NOTE_B3, NOTE_C4
};

// note durations: 4 = quarter note, 8 = eighth note, etc.:
int noteDurations[] = {
  4, 8, 8, 4, 4, 4, 4, 4
};

void setup() {
  Serial.begin(115200);
  //pinMode(ledPin, OUTPUT); // Initialize serial communication at 9600 baud rate
  pinMode(ledPin, OUTPUT); // Set the ledPin as an OUTPUT

  pinMode(trigPin, OUTPUT); // Set the trigPin as an Output
  pinMode(echoPin, INPUT); // Set the echoPin as an Input
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Clear the trigPin by setting it LOW
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);

  // Set the trigPin HIGH for 10 microseconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);

  // Calculate the distance
  distance = (duration/2) /29.1; // Speed of sound wave go and back

  // Print the distance on the Serial Monitor
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  delay(1000);

  if (distance < 150) {
    digitalWrite(ledPin, HIGH); // turn on ledPin
    Serial.println("Owww! D:");
    delay(1000);
    noTone(buzzerPin);
}else {
  digitalWrite(ledPin, LOW); 
  Serial.println("Hoorayy! :D");
  for (int thisNote = 0; thisNote < 8; thisNote++) {
      // to calculate the note duration, take one second divided by the note type.
      //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.
      int noteDuration = 1000 / noteDurations[thisNote];
      tone(buzzerPin, melody[thisNote], noteDuration);
      // to distinguish the notes, set a minimum time between them.
      // the note's duration + 30% seems to work well:
      int pauseBetweenNotes = noteDuration * 1.30;
      delay(pauseBetweenNotes);
      // stop the tone playing:
      noTone(buzzerPin);
    }
}
}