#include <Wire.h> 
#include <DS1307RTC.h>  
//#include <TimeLib.h> //cai// a basic DS1307 library that returns time as a time_t //cai
#include <LiquidCrystal.h> 
LiquidCrystal lcd(12,11 , 7, 6, 5, 4);

#define tangphut A0
#define giamphut A3

unsigned long Hour;
unsigned long Minute;
int tam=1;
int tam1=1;

tmElements_t tm;  

void chinhphut()
{
if(digitalRead(tangphut)==LOW&& tam==1)
{ 
  delay(20);
  if(digitalRead(tangphut)==LOW&& tam==1)
  { 
  tm.Minute++;
  tam=0;
  tm.Second=0; //set giay ban dau
  RTC.write(tm); //ham chinh thoi gian
  }
}
if(digitalRead(tangphut)==HIGH && tam==0 ) {tam=1;}
//////////////////////////////////////////////////////
if(digitalRead(giamphut)==LOW&& tam1==1)
{ 
  delay(20);
  if(digitalRead(giamphut)==LOW&& tam1==1)
  { 
  tm.Minute--;
  tam1=0;
  tm.Second=0; //set giay ban dau
  RTC.write(tm); //ham chinh thoi gian
  }
}
if(digitalRead(giamphut)==HIGH && tam1==0 ) {tam1=1;}

}

void setup()  
{
 lcd.begin(16, 2);
 pinMode(tangphut, INPUT_PULLUP); //khai bao nutnhan
 pinMode(giamphut, INPUT_PULLUP);


}

void loop()
{
   digitalClockDisplay(); 

  if (RTC.read(tm)) //doc gia trị hms tu ds
  {

  Hour = tm.Hour;
  Minute = tm.Minute;
    
if (tm.Hour == 13) Hour = 1;
if (tm.Hour == 14) Hour = 2;
if (tm.Hour == 15) Hour = 3;
if (tm.Hour == 16) Hour = 4;
if (tm.Hour == 17) Hour = 5;
if (tm.Hour == 18) Hour = 6;
if (tm.Hour == 19) Hour = 7;
if (tm.Hour == 20) Hour = 8;
if (tm.Hour == 21) Hour = 9;
if (tm.Hour == 22) Hour = 10;
if (tm.Hour == 23) Hour = 11;
if (tm.Hour == 0) Hour = 12;

chinhphut(); 

 }
}

void digitalClockDisplay()
{
lcd.setCursor(4, 0);      // Set LCD cursor position (column, row)
lcd.print(tm.Hour);

lcd.setCursor(7, 1); 

lcd.print(tm.Minute/10%10);
lcd.print(tm.Minute%10);
lcd.setCursor(10, 1); 

lcd.print(tm.Second/10%10);
lcd.print(tm.Second%10);
}