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

LiquidCrystal_I2C lcd(0x27, 16, 2);

unsigned long currentMillis;
unsigned long prevMillis = 0;
const unsigned long interval = 1000; 

int i; // Deklarasikan i disini

const int buzzerPin = 7 // pin 7

// PIN SETUP 
int led1 = 10;
int led2 = 8;
int led3 = 9;
int led4 = 2;
int led5 = 3;
int led6 = 12;
int led7 = 13;
int buzzer = 7;    // deklarasikan
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() {
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  pinMode(buzzerPin, OUTPUT); // I

  int songLength = sizeof (melody)

for (int thisNote = 0; thisNote < songLength; thisNote++) {
  // hitung jumblah nada dalam lagu
  int deration = 1000 / noteDurations[thisNote];
  // mainkan nada dengan fungsi tone(pin, frekuensi, durasi)
  tone(buzzerpin, melody[thisNote], duration);

  // beri jedaa singkay antar nada agar terdengar jelas
  int pauseBetweenNotes = duration * 1.30;
  delay(pauseBetweenNotes);

  // hentikan nada sebelum memulai yang baru
  noTone(buzzerPin);

}


  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
  for (int i = 0; i < 12; i++) 



    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);

    if (currentMillis - prevMillis = interval) 
      prevMillis = currentMillis;
      Serial.println ();
    

    digitalWrite(led4, HIGH);
    delay(100);
    digitalWrite(led4, LOW);
    delay(100);
    digitalWrite(led5, HIGH);
    delay(100);
    digitalWrite(led5, LOW);
    delay(100);
    digitalWrite(led6, HIGH);
    delay(100);
    digitalWrite(led6, LOW);
    delay(100);
  }
  }