//Adapted from ahmedebeed555
//  https://www.youtube.com/watch?v=1wWdtkLxMaQ
// https://www.instructables.com/Arduino-Digital-Clock-Without-RTC-Real-Time-Clock-/



#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

/* Keypad setup */
const byte KEYPAD_ROWS = 4;
const byte KEYPAD_COLS = 4;
byte rowPins[KEYPAD_ROWS] = {12, 11, 10, 9};
byte colPins[KEYPAD_COLS] = {8, 7, 6, 5};
char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);

LiquidCrystal_I2C lcd(0x27, 20, 4); // I2C address 0x27, 20 column and 4 rows


int h = 11;
int m = 58;
int s = 0;
int flag = 0;
int TIME = 0;
const int hs = 0;
const int ms = 1;
int state1 = 0;
int state2 = 0;
void setup()
{
  lcd.begin(16, 2);
  pinMode(hs, INPUT_PULLUP);
  pinMode(ms, INPUT_PULLUP);
}
void loop()
{
  lcd.setCursor(0, 0);
  s = s + 1;
  lcd.print("TIME:" );
  lcd.print(h);
  lcd.print(":");
  lcd.print(m);
  lcd.print(":");
  lcd.print(s);
  if (flag < 12) lcd.print(" AM");
  if (flag == 12) lcd.print(" PM");
  if (flag > 12) lcd.print(" PM");
  if (flag == 24) flag = 0;
  delay(1000);
  lcd.clear();
  if (s == 60)
  {
    s = 0;
    m = m + 1;
  }
  if (m == 60)
  {
    m = 0;
    h = h + 1;
    flag = flag + 1;
  }
  if (h == 13)
  {
    h = 1;
  }
  lcd.setCursor(0, 1);
  
  state1 = digitalRead(hs);
  if (state1 == 0)
  {
    h = h + 1;
    flag = flag + 1;
    if (flag < 12) lcd.print(" AM");
    if (flag == 12) lcd.print(" PM");
    if (flag > 12) lcd.print(" PM");
    if (flag == 24) flag = 0;
    if (h == 13) h = 1;
  }
  state2 = digitalRead(ms);
  if (state2 == 0)
  {
    s = 0;
    m = m + 1;
  }
}