#include <LiquidCrystal_I2C.h>
#include "pitches.h"

LiquidCrystal_I2C lcd(0x27, 20, 4);

const int button_1 = 2;
const int button_2 = 3;
const int LED_1 = 8;
const int LED_2 = 9;
const int buzzer = 7;

bool LED_1State = false; // สถานะ LED_1
bool LED_2State = false; // สถานะ LED_2

void setup() {
  pinMode(LED_1, OUTPUT);
  pinMode(LED_2, OUTPUT);
  pinMode(button_1, INPUT_PULLUP);
  pinMode(button_2, INPUT_PULLUP);
  pinMode(buzzer, OUTPUT);

  lcd.init();
  lcd.backlight();

  lcd.setCursor(3, 0);
  lcd.print("LED 1 off");
  lcd.setCursor(3, 1);
  lcd.print("LED 2 off");
}

void loop() {
  if (digitalRead(button_1) == LOW) {
    delay(50); 
    while (digitalRead(button_1) == LOW) {} 

    LED_1State = !LED_1State; 

    if (LED_1State) {
      digitalWrite(LED_1, HIGH);
      lcd.setCursor(9, 0);
      lcd.print("   ");
      lcd.setCursor(9, 0);
      lcd.print("on");
      tone(buzzer, NOTE_C5, 100);
    } else {
      digitalWrite(LED_1, LOW);
      lcd.setCursor(9, 0);
      lcd.print("   ");
      lcd.setCursor(9, 0);
      lcd.print("off");
      tone(buzzer, NOTE_C5, 100);
    }
  }

  if (digitalRead(button_2) == LOW) {
    delay(50); 
    while (digitalRead(button_2) == LOW) {}

    LED_2State = !LED_2State; 

    if (LED_2State) {
      digitalWrite(LED_2, HIGH);
      lcd.setCursor(9, 1);
      lcd.print("   ");
      lcd.setCursor(9, 1);
      lcd.print("on");
      tone(buzzer, NOTE_C5, 100); 
    } else {
      digitalWrite(LED_2, LOW);
      lcd.setCursor(9, 1);
      lcd.print("   ");
      lcd.setCursor(9, 1);
      lcd.print("off");
      tone(buzzer, NOTE_C5, 100); 
    }
  }
}