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

RTC_DS1307 rtc;

LiquidCrystal_I2C lcd(0x27, 16, 2);

int buzzer = 8;

// Alarm time
int alarmHour = 10;
int alarmMinute = 30;

void setup() {

  pinMode(buzzer, OUTPUT);

  Serial.begin(96000);

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

  rtc.begin();

  // Set RTC time only once
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

void loop() {

  DateTime now = rtc.now();

  lcd.setCursor(0,0);
  lcd.print("Time: ");

  lcd.print(now.hour());
  lcd.print(":");

  lcd.print(now.minute());
  lcd.print(":");

  lcd.print(now.second());

  // Alarm condition
  if(now.hour() == alarmHour &&
     now.minute() == alarmMinute)
  {
      digitalWrite(buzzer, HIGH);

      lcd.setCursor(0,1);
      lcd.print("ALARM ON ");
  }
  else
  {
      digitalWrite(buzzer, LOW);

      lcd.setCursor(0,1);
      lcd.print("Normal Mode");
  }

  delay(1000);
}