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

RTC_DS1307 rtc;

LiquidCrystal_I2C lcd(0x3F, 16, 2);

char weekDay[7][12] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" };

#define led 19
#define button 18
int buttonState=0;
String buttonValue = "ON";

void setup() {
  pinMode(led, OUTPUT);
  pinMode(button, INPUT_PULLUP);
  Wire.begin();
  rtc.begin();
   
  Wire.beginTransmission(0x3F);
  if (Wire.endTransmission())
  {
    lcd = LiquidCrystal_I2C(0x27, 16, 2);
  }
  lcd.init();
  lcd.backlight();
  lcd.setCursor(2,0);
  lcd.print("Clock  Alarm");
  delay(1000);
  lcd.clear();


}

void loop() {
  checkAlarmOn();
  DateTime now = rtc.now();

  
    lcd.setCursor(10, 0);
    lcd.println(weekDay[now.dayOfTheWeek()]); 
    lcd.setCursor(0, 1);
    if(now.day()<10){
      lcd.print("0");
    }
    lcd.print(now.day(), DEC); 
    lcd.print("/");
    if(now.month()<10){
      lcd.print("0");
    }
    lcd.print(now.month(), DEC);
    lcd.print("/");
    lcd.print(now.year(), DEC); 

  lcd.setCursor(0, 0);
    if(now.hour()<10){
      lcd.print("0");
    }
    lcd.print(String(now.hour()));
    lcd.print(":");
    if(now.minute()<10){
      lcd.print("0");
    }
    lcd.print(String(now.minute()));
    lcd.print(":");
    if(now.second()<10){
      lcd.print("0");
    }
    lcd.print(String(now.second()));
}

 void checkAlarmOn() {

  buttonState = digitalRead(button);

  if(buttonState==LOW){
    if(buttonValue=="ON"){
      buttonValue="OFF";
      digitalWrite(led, HIGH);
      delay(100);
    } else if(buttonValue=="OFF"){
      buttonValue="ON";
      digitalWrite(led, LOW);
      delay(100);

    }
    lcd.clear();
    lcd.setCursor(3,0);
    lcd.print("Clock Alarm");
    lcd.setCursor(6,1);
    lcd.print(buttonValue);
    delay(1000);
    lcd.clear();


}}