#include <Wire.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#include "RTClib.h"
RTC_DS1307 rtc;

char dataHari[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
String hari;
int tanggal, bulan, tahun, jam, menit, detik;
const int bzPIN = 13;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  if (! rtc.begin()) 
  {
    Serial.println("RTC OFF");
    Serial.flush();
    abort();
  }
  lcd.init();
  lcd.backlight();
  pinMode(bzPIN, OUTPUT);
}

void loop() {
  DateTime now = rtc.now();
  hari    = dataHari[now.dayOfTheWeek()];
  tanggal = now.day();
  bulan   = now.month();
  tahun   = now.year();
  jam     = now.hour();
  menit   = now.minute();
  detik   = now.second();
  lcd.setCursor(2,0);
  lcd.print(String() +hari+"," +tanggal+"-"+bulan+"-"+tahun);
  lcd.setCursor(4,1);
   lcd.print(String() +jam+":" +menit+":"+detik);
    noTone(bzPIN);
delay(500);

  Serial.print(dataHari[now.dayOfTheWeek()]);  
    Serial.print(',');    
    Serial.print(now.day(), DEC);
    Serial.print('-');
    Serial.print(now.month(), DEC);
    Serial.print('-');
    Serial.print(now.year(), DEC);
    Serial.print(" ");   
    Serial.print(now.hour(), DEC);
    Serial.print(':');
    Serial.print(now.minute(), DEC);
    Serial.print(':');
    Serial.print(now.second(), DEC);
    Serial.println();
delay(500);

//setting alarm
  if (now.hour() == 14 && now.minute() == 31){
      buzzer_on();
    }
}

void buzzer_on() {
    tone(bzPIN, 1000); // Send 1KHz sound signal...
    delay(500);        // ...for 1 sec
    noTone(bzPIN);     // Stop sound...
    //digitalWrite(buzzer, HIGH); //untuk buzzer active low
    delay(500);        // ...for 1sec
}