#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define I2C_ADDR 0x27
#define LCD_COLS 20
#define LCD_ROWS 4

#define BUZZER_PIN 9

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLS, LCD_ROWS);


const int songLength = 31;


char notes[] = "eee eee egcde fff ffee eeggfdc " ; 

int beats[] = {2,2,3,1, 2,2,3,1, 2,2,3,1,4,4, 2,2,3,0, 1,2,2,2,0, 1,1,2,2,2,2,4,4};


int tempo = 100;

String lyrics[] = {
 "Jingle bells", 
 "jingle bells",
 "Jingle all the way",
 "Oh, what fun it is to ride",
 "In a one-horse open sleigh",

};


void setup() 
{
  lcd.begin(LCD_COLS, LCD_ROWS);
  lcd.backlight();
  lcd.clear();

  pinMode(BUZZER_PIN, OUTPUT);
  

}


void loop() 
{
  int i, b, duration;

  
  for (i = 0; i < songLength; i++) 
  {
    duration = beats[i] * tempo;  
    
    if (notes[i] == ' ')          
    {
      delay(duration);            
    }
    else                          
    {
      tone(BUZZER_PIN, frequency(notes[i]), duration);
      digitalWrite(13, HIGH);
      delay(duration);            
    }
    digitalWrite(13, LOW);
    delay(tempo/10);              

  }
   lcd.setCursor(0, 0);
  lcd.print("Jingle bell");

  for (int i = 0; i < sizeof(lyrics) / sizeof(lyrics[0]); i++) {
    lcd.setCursor(0, i % LCD_ROWS);
    lcd.print(lyrics[i]);

    playNote(notes[i], beats[i]);

    delay(1000); 
  lcd.clear();
  for(int i=0;i<10;i++){
   lcd.scrollDisplayRight();
   delay(2000);
  }
  
}

int frequency(char note) 
{
  
  int i;
  const int numNotes = 8;  

  char names[] = { 'c', 'd', 'e', 'f', 'g', 'a', 'b', 'C' };
  int frequencies[] = {262, 294, 330, 349, 392, 440, 494, 523};
  
 
  for (i = 0; i < numNotes; i++)  
  {
    if (names[i] == note)         
    {
      return(frequencies[i]);     
    }
  }
  return(0); 


  
}

}
void playNote(int note, int duration) {
  tone(BUZZER_PIN, note, duration);
  delay(duration);
  noTone(BUZZER_PIN);
}