// include the library
#include <LiquidCrystal_I2C.h>


// initialize the interface pins
LiquidCrystal_I2C lcd(0x27, 16, 2);
int s, m, h, a, d, state, state1, state2, dg, cnt;

#define BUTTON_PIN_1 2
#define BUTTON_PIN_2 3
#define BUTTON_PIN_3 10

// the 8 arrays that form each segment of the custom numbers
byte bar1[8] =
{
  B11100,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11110,
  B11100
};
byte bar2[8] =
{
  B00111,
  B01111,
  B01111,
  B01111,
  B01111,
  B01111,
  B01111,
  B00111
};
byte bar3[8] =
{
  B11111,
  B11111,
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111
};
byte bar4[8] =
{
  B11110,
  B11100,
  B00000,
  B00000,
  B00000,
  B00000,
  B11000,
  B11100
};
byte bar5[8] =
{
  B01111,
  B00111,
  B00000,
  B00000,
  B00000,
  B00000,
  B00011,
  B00111
};
byte bar6[8] =
{
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B11111,
  B11111
};
byte bar7[8] =
{
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00111,
  B01111
};
byte bar8[8] =
{
  B11111,
  B11111,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000,
  B00000
};


void setup()
{

  //lcd.begin(16, 2);

  lcd.init();
  lcd.backlight();

  pinMode(BUTTON_PIN_1, INPUT_PULLUP);
  pinMode(BUTTON_PIN_2, INPUT_PULLUP);
  pinMode(BUTTON_PIN_3, INPUT_PULLUP);

  state = 1;
  state1 = 1;
  state2 = 1;

  s = 0;
  m = 0;
  h = 0;
  a = 0;

  lcd.createChar(1, bar1);
  lcd.createChar(2, bar2);
  lcd.createChar(3, bar3);
  lcd.createChar(4, bar4);
  lcd.createChar(5, bar5);
  lcd.createChar(6, bar6);
  lcd.createChar(7, bar7);
  lcd.createChar(8, bar8);
}

void custom0(int col)
{ // uses segments to build the number 0
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(8);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
}

void custom1(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom2(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(5);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(6);
}

void custom3(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(5);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1);
}

void custom4(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom5(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(4);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1);
}

void custom6(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(4);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
}

void custom7(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(8);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom8(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
}

void custom9(int col)
{
  lcd.setCursor(col, 0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1);
}

void printNumber(int value, int col) {
  if (value == 0) {
    custom0(col);
  } if (value == 1) {
    custom1(col);
  } if (value == 2) {
    custom2(col);
  } if (value == 3) {
    custom3(col);
  } if (value == 4) {
    custom4(col);
  } if (value == 5) {
    custom5(col);
  } if (value == 6) {
    custom6(col);
  } if (value == 7) {
    custom7(col);
  } if (value == 8) {
    custom8(col);
  } if (value == 9) {
    custom9(col);
  }
}


void loop()

{
  if (!digitalRead(BUTTON_PIN_1)&state == 1) {
    cnt++;
    state = 0;
    if (cnt > 3) {
      cnt = 0;
    }
  } else if (digitalRead(BUTTON_PIN_1)&state == 0) {
    state = 1;
  }

  if (!digitalRead(BUTTON_PIN_2) && state1 == 1) {
    dg = 1;
    state1 = 0;

  } else if (digitalRead(BUTTON_PIN_2)&state1 == 0) {
    state1 = 1;
  }

  if (!digitalRead(BUTTON_PIN_3) && state2 == 1) {
    dg = -1;
    state2 = 0;
  } else if (digitalRead(BUTTON_PIN_3)&state2 == 0) {
    state2 = 1;
  }
  switch (cnt) {
    case 1:
      m = m + dg;
      dg = 0;  if (m > 59) {
        m = 59;
      }
      if (m < 0) {
        m = 0;
      }
      break;

    case 2:
      h = h + dg;
      dg = 0; if (h > 11) {
        h = 11;
      }
      if (h < 0) {
        h = 0;
      }
      break;
    case 3:
      if (dg == 1) {
        a = 1;
        dg = 0;
      }
      if (dg == -1) {
        a = 0;
        dg = 0;
      }
      break;
  }
  if (s > 59) {
    s = 0;
    m++;

    if (m > 59) {
      m = 0;
      h++;

      if (h > 11) {
        h = 0;
        a = !a;
      }
    }
  }
  d = h % 10;
  printNumber(d, 3);
  d = h / 10;
  printNumber(d, 0);

  d = m % 10;
  printNumber(d, 10);
  d = m / 10;
  printNumber(d, 7);
  lcd.setCursor(14, 0);
  if (a) {
    lcd.print("AM");
  } else {
    lcd.print("PM");
  }
  if (cnt == 0) {
    s++;
    lcd.setCursor(6, 0);
    lcd.print(" ");
    lcd.setCursor(6, 1);
    lcd.print(" ");
    delay(500);
    lcd.setCursor(6, 0);
    lcd.print(".");
    lcd.setCursor(6, 1);
    lcd.print(".");
    delay(500);
  }
}