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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

const int led1Pin = 13;   
const int led2Pin = 12;  
const int button1Pin = 9; 
const int button2Pin = 7; 
const int buzzerPin = 8;   

bool led1State = false; 
bool led2State = false; 

int lastButton1State = HIGH; 
int lastButton2State = HIGH; 



void setup() {
  lcd.init();
  lcd.backlight();
  pinMode(led1Pin, OUTPUT);    
  pinMode(led2Pin, OUTPUT);    
  pinMode(button1Pin, INPUT_PULLUP); 
  pinMode(button2Pin, INPUT_PULLUP); 
  pinMode(buzzerPin, OUTPUT); 

  lcd.begin(16, 2);  
  lcd.setCursor(0, 0); 
  lcd.print("LED1: OFF");  
  lcd.setCursor(0, 1);   
  lcd.print("LED2: OFF");
}

void loop() {
 
  int button1State = digitalRead(button1Pin);
  if (button1State == LOW && lastButton1State == HIGH) { 
    led1State = !led1State; 
    digitalWrite(led1Pin, led1State ? HIGH : LOW);
    
   
    tone(buzzerPin, 2000);
    delay(100); 
    noTone(buzzerPin);      // Stop the tone
    delay(100); 
  }
  lastButton1State = button1State; 

 
  int button2State = digitalRead(button2Pin);
  if (button2State == LOW && lastButton2State == HIGH) { 
    led2State = !led2State; 
    digitalWrite(led2Pin, led2State ? HIGH : LOW);
    
    
    tone(buzzerPin, 2000);
    delay(100); 
    noTone(buzzerPin);      // Stop the tone
    delay(100); 
  }
  lastButton2State = button2State; 

 
  lcd.clear();  
  lcd.print("LED1: ");
  lcd.print(led1State ? "ON" : "OFF");  
  lcd.setCursor(0, 1);    
  lcd.print("LED2: ");
  lcd.print(led2State ? "ON" : "OFF");  

  delay(50); 
}