//https://docs.arduino.cc/built-in-examples/digital/Debounce/
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include <math.h>
#define alarmPin 13
const int button1   =  9;                   // button1 pin number
const int button2   = 10;                   // button1 pin number
const int button3   = 11;                   // button1 pin number
const int alarm_pin = 12;                   // Alarms pin number
const int alarm[]={2024,1,25,20,0,4};
 int alarm1[]={2024,1,25,20,0,4};
const int waitTime =9000;


#define I2C_ADDR    0x27
#define LCD_COLUMNS 16
#define LCD_LINES   2
#define SERIAL_OPTION 0 

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);
RTC_DS1307 rtc;


int led=4;
int b = 2;
int val=0,led_num=0;
int ledstate=LOW;
int buttonState;
int lastButtonState = LOW;
unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled
unsigned long debounceDelay = 30; 
void setup() {
  if (SERIAL_OPTION) Serial.begin(9600);   // 시리얼통신 초기화

    lcd.init();     // LCD 초기화
  lcd.backlight();  // LCD 백라이트 켜기

  rtc.begin();    // 실시간시계 시작

   pinMode(9,  INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  pinMode(12, OUTPUT);
  digitalWrite(alarm_pin, LOW);
/*  lcd.begin(16,2);
lcd.backlight();*/

 
 while (!Serial); // for Leonardo/Micro/Zero

  Serial.begin(9600);
  if (! rtc.begin()) {
    Serial.println("Couldn't find RTC");
    while (1);
  }

  if (! rtc.isrunning()) {
    Serial.println("RTC is NOT running!");
    // following line sets the RTC to the date & time this sketch was compiled
    // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
    // This line sets the RTC with an explicit date & time, for example to set
    // January 21, 2014 at 3am you would call:
     //rtc.adjust(DateTime(2019, 3, 3, 20, 0, 0));
  }
  rtc.adjust(DateTime(2024, 1, 24, 20, 0, 0));
 // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

void loop(){
    DateTime now = rtc.now();
    //val = val++;
  
             
           DS3231_read(now);
         DS3231_display() ;      
       //      Alarm_display() ; 
if(checkAlarm(now)){
    digitalWrite(alarmPin, HIGH);// 
    lcd.setCursor(0,0); 
    lcd.print("Alarm Triggered"); 
    Serial.print("Alarm Triggered");
    delay(waitTime);
    //while (1);// wait for ever 
   }else{
    digitalWrite(alarmPin, LOW);//
   }
    Serial.println();
 

  // save the reading. Next time through the loop, it'll be the lastButtonState:

  }
 
boolean checkAlarm(DateTime timeNow){

  if(
   alarm[0] ==timeNow.year()
   &&
   alarm[1] ==timeNow.month()
   &&
   alarm[2] ==timeNow.day()
   &&
   alarm[3] ==timeNow.hour()
   &&
   alarm[4] ==timeNow.minute()
   &&
   alarm[5] ==timeNow.second()
   ){
      return true;
   }else{
      return false;
     
   }
  
}//checkAlarm
int second ;
 int minute ; int hour ;      int day    ; int  month  ;   int  year ;     
void DS3231_read(DateTime timeNow){                             // Function to read time & calendar data
             // Request 7 bytes from DS3231 and release I2C bus at end of reading
  second = timeNow.second();                         // Read seconds from register 0
   minute = timeNow.minute();                         // Read minuts from register 1
   hour   = timeNow.hour();                         // Read hour from register 2
   day    = timeNow.day();                         // Read day from register 3
                         // Read date from register 4
   month  = timeNow.month();                         // Read month from register 5
  year   = timeNow.year();                         // Read year from register 6
}
 void DS3231_display()   
 {
  lcd.setCursor(0,0); lcd.print("DATE: ");
  lcd.print(year); lcd.print("/"); lcd.print(month); lcd.print("/"); lcd.print(day);
  lcd.setCursor(0,1); lcd.print("TIME: ");
  lcd.print(hour); lcd.print(":"); lcd.print(minute); lcd.print(":"); lcd.print(second);
     
 }
 void   Alarm_display() {
  lcd.setCursor(0,0); lcd.print("Alarm: ");
  lcd.print(alarm[0]); lcd.print("/"); lcd.print(alarm[1]); lcd.print("/"); lcd.print(alarm[2]);
  lcd.setCursor(0,1); lcd.print("TIME: ");
  lcd.print(alarm[3]); lcd.print(":"); lcd.print(alarm[4]); lcd.print(":"); lcd.print(alarm[5]);
     
 } 














/*
void loop(){
  //read the value of the button when pressed
  val=digitalRead(b);

  //in this example, the value of the button when pressed is 1
  if(val==1){
    //reverse the current state of the ledstate variable
    ledstate=!ledstate;
    //the ledstate variable controls the HIGH or LOW state
    digitalWrite(led,ledstate); 
    if (ledstate==HIGH){
      lcd.clear(); //erase all text on the lcd
      lcd.setCursor(0,0);
      lcd.print("LED is ON");}
    else{
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("LED is OFF");
      }
    //wait .5 second before the next reading
    delay(500);
  }
}*/