#include <LCD_I2C.h>

LCD_I2C lcd(0x27, 16, 2);  // Default address of most PCF8574 modules, change according

#define PB1 12
#define PB2 11
#define LED1 10
#define LED2 9
#define BUZZER 13

int a;
int b;


void setup() {
  lcd.begin();      //Mulai LCD
  lcd.backlight();  //Nyalakan Backlight

  pinMode(PB1, INPUT);
  pinMode(PB2, INPUT);
  pinMode(LED1, OUTPUT);
  pinMode(LED2, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  //Tampilan Awal
  lcd.setCursor(2, 0);
  lcd.print("KELAS TEKNISI");
  lcd.setCursor(5, 1);
  lcd.print("OTOMASI");
  delay(1000);
  lcd.clear();
}

void loop() {
  int button1 = digitalRead(PB1);
  int button2 = digitalRead(PB2);

  if (button1 == HIGH) {
    tone(BUZZER, 1800);
    while (digitalRead(PB1) == HIGH) {}
    a++;
    tone(BUZZER, 1800);
    delay(100);
    noTone(BUZZER);
  }
  if (button2 == HIGH) {
    tone(BUZZER, 1000);
    while (digitalRead(PB2) == HIGH) {}
    b++;
    tone(BUZZER, 1000);
    delay(100);
    noTone(BUZZER);
  }

  if (a > 1) {
    a = 0;
  }
  if (b > 1) {
    b = 0;
  }

  if (a == 0) {
    lcd.setCursor(0, 0);
    lcd.print("Lampu 1 = OFF");
    digitalWrite(LED1, LOW); 
  }
  if (a == 1) {
    lcd.setCursor(0, 0);
    lcd.print("Lampu 1 = ON ");
    digitalWrite(LED1, HIGH);
    delay(100);
    buzz1();
  }

  if (b == 0) {
    lcd.setCursor(0, 1);
    lcd.print("Lampu 2 = OFF");
    digitalWrite(LED2, LOW);
  }
  if (b == 1) {
    lcd.setCursor(0, 1);
    lcd.print("Lampu 2 = ON ");
    digitalWrite(LED2, HIGH);
    delay(100);
    buzz2();
  }
}

void buzz1(){
  tone(BUZZER, 800);
  delay(200);
}

void buzz2(){
  tone(BUZZER, 1000);
  delay(200);
}