#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include "RTClib.h"
#define buzzer 7 //pin buzzer

LiquidCrystal_I2C lcd(0x27, 16, 2);
RTC_DS1307 rtc;

char daysOfTheWeek[7][12] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};

void setup () {
  pinMode(buzzer, OUTPUT);
  Serial.begin(57600);
  lcd.begin(16,2);
  lcd.backlight();
  lcd.setCursor(0,0);
  delay(1000);
  lcd.clear();
  
  if (! rtc.begin()) {
    lcd.print("Couldn't find RTC");
    while (1);
  }
  if (! rtc.isrunning()) {
    lcd.print("RTC not running");
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }
}
void loop () {
    DateTime now = rtc.now();
    lcd.setCursor(0, 0);
    lcd.print(daysOfTheWeek[now.dayOfTheWeek()]); lcd.print(", ");
    lcd.print(now.day(), DEC);  
    lcd.print('/');
    lcd.print(now.month(), DEC);
    lcd.print('/');
    lcd.print(now.year(), DEC); 
    lcd.print(' ');
    lcd.setCursor(0, 1);
    if (now.hour()<10)  lcd.print('0');
    lcd.print(now.hour(), DEC);lcd.print(':');
    if (now.minute()<10) lcd.print('0'); 
    lcd.print(now.minute(), DEC); lcd.print(':');
    if (now.second()<10) lcd.print('0');  
    lcd.print(now.second(), DEC);
    lcd.setCursor(12, 0);
    
    //setting Alarmnya (12:00) >> dapat disesuaikan jamnya
    if (now.hour() == 12 && now.minute() == 00){
      buzzer_on();
    }
}
void buzzer_on() {
    tone(buzzer, 1000); // Send 1KHz sound signal...
    delay(500);        // ...for 1 sec
    noTone(buzzer);     // Stop sound...
    //digitalWrite(buzzer, HIGH); //untuk buzzer active low
    delay(500);        // ...for 1sec
}