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

LiquidCrystal_I2C lcd(0x27, 20, 4);

const int button_1 = 2;
const int button_2 = 3;
int button_1Event = 1;
int button_2Event = 1;
const int LED_1 = 8;
const int LED_2 = 9;
const int buzzer = 7;

void setup() {

  pinMode(LED_1, OUTPUT);
  pinMode(LED_2, OUTPUT);
  pinMode(button_1, INPUT);
  pinMode(button_2, INPUT);
  pinMode(buzzer, OUTPUT);

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

  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){

    if(button_1Event == 1){
    digitalWrite(LED_1, HIGH);
    lcd.setCursor(9,0);
    lcd.print("   ");
    lcd.setCursor(9,0);
    lcd.print("on");

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

    button_1Event *= -1;
    while(digitalRead(button_1) == LOW ) {}
    delay(10); 

  }

  else if(digitalRead(button_2) == LOW){

    if(button_2Event == 1){
    digitalWrite(LED_2, HIGH);
    lcd.setCursor(9,1);
    lcd.print("   ");
    lcd.setCursor(9,1);
    lcd.print("on");

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

    button_2Event *= -1;
    while(digitalRead(button_2) == LOW ) {}
    delay(10); 

  }
 
}