#include <TimeLib.h>
#include <DS1307RTC.h>

#define off 1
#define on 0
#define don 1
#define doff 0

int a = 12, b = 13, c = 7, d = 8, e = 9, f = 11, g = 10, dp = 6; //pins to activate segment
int dis1 = 5, dis2 = 4, dis3 = 3, dis4 = 2;     //enable pins for display(anode type display used

int button_1 = A0;                              //for updating hour
int button_2 = A1;                              //for updating second
int button_3 = A2;                              //for updating minute

int Hour_T = 0, Hour_O = 0, minute_T = 0, minute_O = 0;
int A_hour = 0, A_minute = 0, A_second = 0, psec = 0;
unsigned long current_time, previous_time;
int interval = 1000;
//refresh rate of display and button
int button_R = 150;
int display_R = 2; //adjust display refresh according to your need
unsigned long c_time = 0, p_time = 0, cc_time = 0, p_button_time = 0;
void setup() {
  Serial.begin(115200);
  pinMode(a, OUTPUT);
  pinMode(b, OUTPUT);
  pinMode(c, OUTPUT);
  pinMode(d, OUTPUT);
  pinMode(e, OUTPUT);
  pinMode(f, OUTPUT);
  pinMode(g, OUTPUT);
  pinMode(dp, OUTPUT);

  pinMode(dis1, OUTPUT);
  pinMode(dis2, OUTPUT);
  pinMode(dis3, OUTPUT);
  pinMode(dis4, OUTPUT);

  pinMode(button_1, INPUT_PULLUP);
  pinMode(button_2, INPUT_PULLUP);
  pinMode(button_3, INPUT_PULLUP);
}

void loop() {
  run_clock();

}


void time_count()
{ current_time = millis();
  if (current_time - previous_time >= interval)
  { previous_time = current_time;
    ++A_second;
  }
  if (A_second == 60)
  { A_second = 0;
    ++A_minute;
  }
  if (A_minute == 60)
  { A_minute = 0;
    ++A_hour;
  }
  if (A_hour == 24)
  { A_hour = 0;
  }
  if (psec != A_second)
  { psec = A_second;
    if (digitalRead(dp) == 0)
    {
      digitalWrite(dp, 1);
    }
    else
    {
      digitalWrite(dp, 0);
    }
  }

}
/////////////////////////////////////////////////////


/////////////////////////////////////////////////////
void run_clock()
{
  // time_count();
  button_p();
  tmElements_t tm;
  if (RTC.read(tm))
  {
    A_hour = tm.Hour;
    A_minute = tm.Minute;
    A_second=tm.Second;
  } else {
    A_hour = 12;
    A_minute = 00;
    A_second = 00;
  }
  convert_time(A_hour, A_minute);

  displayd();
}
/////////////////////////////////////////////////////
void button_p()
{
  cc_time = millis();
  tmElements_t tm;
  (RTC.read(tm));

  if (cc_time - p_button_time >= button_R)
  { p_button_time = cc_time;
    if (digitalRead(button_1) == 0) {
      tm.Hour++;
      RTC.write(tm);
    }
    if (digitalRead(button_2) == 0) {
      // A_second = 0;
      tm.Second = 0;
      RTC.write(tm);
    }
    if (digitalRead(button_3) == 0) {
      // A_minute++;
      tm.Minute++;
      RTC.write(tm);
    }
  }
}
/////////////////////////////////////////////////////
void convert_time(int h, int m)
{
  Hour_T = h / 10;
  Hour_O = h % 10;
  minute_T = m / 10;
  minute_O = m % 10;
}

/////////////////////////////////////////////////////
void displayd()
{
  c_time = millis();
  if (c_time - p_time >= display_R * 1 && c_time - p_time < display_R * 2)
  {
    display_hourT();
  }

  else if (c_time - p_time >= display_R * 2 && c_time - p_time < display_R * 3)
  {
    display_hourO();
  }

  else if (c_time - p_time >= display_R * 3 && c_time - p_time < display_R * 4)
  {
    display_minuteT();
  }

  else if (c_time - p_time >= display_R * 4 && c_time - p_time < display_R * 5)
  {
    display_minuteO();
  }

  else if (c_time - p_time >= display_R * 5)
  { c_time = millis();
    p_time = c_time;
    all_off();
  }
}
///////////////////////////////////////////////////////////////
void display_hourT()
{ all_off();
  digitalWrite(dis1, don);
  digitalWrite(dis2, doff);
  digitalWrite(dis3, doff);
  digitalWrite(dis4, doff);
  switch (Hour_T)
  {
    case 0:
      N0();
      break;
    case 1:
      N1();
      break;
    case 2:
      N2();
      break;
    case 3:
      N3();
      break;
    case 4:
      N4();
      break;
    case 5:
      N5();
      break;
    case 6:
      N6();
      break;
    case 7:
      N7();
      break;
    case 8:
      N8();
      break;
    case 9:
      N9();
      break;

    default:;
  }

}
//////////////////////////////////////////////////////////////////
void display_hourO()
{ all_off();
  digitalWrite(dis1, doff);
  digitalWrite(dis2, don);
  digitalWrite(dis3, doff);
  digitalWrite(dis4, doff);
  switch (Hour_O)
  {
    case 0:
      N0();
      break;
    case 1:
      N1();
      break;
    case 2:
      N2();
      break;
    case 3:
      N3();
      break;
    case 4:
      N4();
      break;
    case 5:
      N5();
      break;
    case 6:
      N6();
      break;
    case 7:
      N7();
      break;
    case 8:
      N8();
      break;
    case 9:
      N9();
      break;

    default:;
  }

}
//////////////////////////////////////////////////////////////////
void display_minuteT()
{ all_off();
  digitalWrite(dis1, doff);
  digitalWrite(dis2, doff);
  digitalWrite(dis3, don);
  digitalWrite(dis4, doff);
  switch (minute_T)
  {
    case 0:
      N0();
      break;
    case 1:
      N1();
      break;
    case 2:
      N2();
      break;
    case 3:
      N3();
      break;
    case 4:
      N4();
      break;
    case 5:
      N5();
      break;
    case 6:
      N6();
      break;
    case 7:
      N7();
      break;
    case 8:
      N8();
      break;
    case 9:
      N9();
      break;

    default:;
  }

}
//////////////////////////////////////////////////////////////////
void display_minuteO()
{ all_off();
  digitalWrite(dis1, doff);
  digitalWrite(dis2, doff);
  digitalWrite(dis3, doff);
  digitalWrite(dis4, don);
  switch (minute_O)
  {
    case 0:
      N0();
      break;
    case 1:
      N1();
      break;
    case 2:
      N2();
      break;
    case 3:
      N3();
      break;
    case 4:
      N4();
      break;
    case 5:
      N5();
      break;
    case 6:
      N6();
      break;
    case 7:
      N7();
      break;
    case 8:
      N8();
      break;
    case 9:
      N9();
      break;

    default:;
  }

}
//////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////
void all_off()
{
  digitalWrite(a, off);
  digitalWrite(b, off);
  digitalWrite(c, off);
  digitalWrite(d, off);
  digitalWrite(e, off);
  digitalWrite(f, off);
  digitalWrite(g, off);
  digitalWrite(dis1, doff);
  digitalWrite(dis2, doff);
  digitalWrite(dis3, doff);
  digitalWrite(dis4, doff);
}
//////////////////////////////////////////////////////////////////
void all_segment_on()
{


  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, on);
  digitalWrite(f, on);
  digitalWrite(g, on);
}
///////////////////////////////////////////////////
void N0()
{
  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, on);
  digitalWrite(f, on);
  digitalWrite(g, off);

}


///////////////////////////////////////////////////
void N1()
{
  digitalWrite(a, off);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, off);
  digitalWrite(e, off);
  digitalWrite(f, off);
  digitalWrite(g, off);

}


///////////////////////////////////////////////////
void N2()
{
  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, off);
  digitalWrite(d, on);
  digitalWrite(e, on);
  digitalWrite(f, off);
  digitalWrite(g, on);

}


///////////////////////////////////////////////////
void N3()
{
  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, off);
  digitalWrite(f, off);
  digitalWrite(g, on);

}

///////////////////////////////////////////////////
void N4()
{
  digitalWrite(a, off);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, off);
  digitalWrite(e, off);
  digitalWrite(f, on);
  digitalWrite(g, on);

}

///////////////////////////////////////////////////
void N5()
{
  digitalWrite(a, on);
  digitalWrite(b, off);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, off);
  digitalWrite(f, on);
  digitalWrite(g, on);

}

///////////////////////////////////////////////////
void N6()
{
  digitalWrite(a, on);
  digitalWrite(b, off);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, on);
  digitalWrite(f, on);
  digitalWrite(g, on);

}

///////////////////////////////////////////////////
void N7()
{
  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, off);
  digitalWrite(e, off);
  digitalWrite(f, off);
  digitalWrite(g, off);

}

///////////////////////////////////////////////////
void N8()
{
  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, on);
  digitalWrite(f, on);
  digitalWrite(g, on);

}

///////////////////////////////////////////////////
void N9()
{
  digitalWrite(a, on);
  digitalWrite(b, on);
  digitalWrite(c, on);
  digitalWrite(d, on);
  digitalWrite(e, off);
  digitalWrite(f, on);
  digitalWrite(g, on);

}