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

LiquidCrystal_I2C lcd(0x27, 16, 2);

// PIN SETUP
int led1 = 8;
int led2 = 9;
int led3 = 10;
int led4 = 2;
int buzzer = 7;    
int button = 6;    
                   

int melody[] = {
  262, 262, 294, 262, 349, 330,   // “Happy Teachers Day”
  262, 262, 294, 262, 392, 349    // “Thank you for guiding me”
};

int noteDurations[] = {
  4, 4, 4, 4, 4, 2,
  4, 4, 4, 4, 4, 2
};

void setup() {
  lcd.init();
  lcd.backlight();

  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(button, INPUT_PULLUP);
  pinMode(led4, OUTPUT);

  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Press the button");
  lcd.setCursor(0,1);
  lcd.print("to play message");
}

void loop() {
  int baca = digitalRead(button);
  if (baca == LOW){ // LOW tombol di tekan

    digitalWrite(led4, HIGH);
  } else {
    digitalWrite(led4, LOW);
    }
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("Happy Teachers");
    lcd.setCursor(0,1);
    lcd.print("Day! kak andi!");

    
    for (int i = 0; i < 12; i++) {
      digitalWrite(led1, HIGH);
      delay(20);
      digitalWrite(led1, LOW);

      digitalWrite(led2, HIGH);
      delay(20);
      digitalWrite(led2, LOW);

      digitalWrite(led3, HIGH);
      delay(20);
      digitalWrite(led3, LOW);
       digitalWrite(led4, HIGH);

      int duration = 1000 / noteDurations[i];
      tone(buzzer, melody[i], duration);
      delay(duration * 1.30);
      noTone(buzzer);
    }

    digitalWrite(led1, LOW);
    digitalWrite(led2, LOW);
    digitalWrite(led3, LOW);

    delay(100);
  }