/*
  Name: Ganesh Pyndla
  Description: Timer Break circuit using arduino and without RTC;
  Date : 28-01-2024
*/
//Green Button = used for set time/ start setting time
//yellow Button = increment the time
//Blue Button = used for decrement the time
// Red Button = use for set hours and minute and start the timer


#include <LiquidCrystal.h>
// declared buttons for inputs
const int set = 13, hr = 12, mint = 11, start = 10;
// hr1 and mint1 for storing mintus and hours
static int hr1 = 0;
static int mint1 = 0;
// led and Buzz for indicates time duration
const int led = 3;
const int Buzz = 2;
// declared all LCD display pin connections
const int rs = 9, en = 8, d4 = 7, d5 = 6, d6 = 5, d7 = 4;
// pass those pins to Liquid Crystal display function for initaillatation
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
// void setup for one time iniataillatation
// declared all input and output pins
void setup() {
  // set up the LCD's number of columns and rows:
  pinMode(set, INPUT);
  pinMode(hr, INPUT);
  pinMode(mint, INPUT);
  pinMode(start, INPUT);
  pinMode(led, OUTPUT);
  pinMode(Buzz, OUTPUT);
  lcd.begin(16, 2);
  // Print a message to the LCD.
  lcd.setCursor(2, 0);
  lcd.print("SET UR TIME");
  lcd.setCursor(6, 1);
  lcd.print(" : ");
  digitalWrite(Buzz, HIGH);
  delay(1000);
  digitalWrite(Buzz, LOW);
}
// this is main loop we excute instructions continuesly
void loop()
{
  // display the 00:00 formate into the display
  lcd.setCursor(5, 1);
  lcd.print(0);
  lcd.setCursor(6, 1);
  lcd.print(0);
  lcd.setCursor(8, 1);
  lcd.print(0);
  lcd.setCursor(9, 1);
  lcd.print(0);
  // set your start when green button pressed
  if ( digitalRead(set) == HIGH)
  {
    // while loop used to take hours and minutes till press the set button
    while (1)
    {
      // this if condition needs to be set hours and display those hors in lcd as well
      if (digitalRead(hr) == HIGH)
      {
        hr1 = hr1 + 1;
        // if hours greater than 12 hours, again start with 0
        if ( hr1 > 12)
        {
          hr1 = 0;
        }
        // this if condition helps to print hours in lcd in correct foramte like 01 to 09 and 10 to 12
        if (hr1 <= 9)
        {
          lcd.setCursor(5, 1);
          lcd.print(0);
          lcd.setCursor(6, 1);
          lcd.print(hr1);
          delay(300);
        }
        else if ( hr1 >= 10)
        {
          lcd.setCursor(5, 1);
          lcd.print(hr1);
          delay(300);
        }

      }
      // if we want reduce or decrement hours use this if condition

      else if ( digitalRead(mint) == HIGH && hr1 > 0  )
      {
        hr1 = hr1 - 1;
        if ( hr1 <= 9)
        {
          lcd.setCursor(5, 1);
          lcd.print(0);
          lcd.setCursor(6, 1);
          lcd.print(hr1);
          delay(300);
        }
      }
      // this if condition helps to break hours setting using last greaan button
      // jump into mints setting
      else if ( digitalRead(start) == HIGH )
      {
        break;
      }
    }
    // while loop use set minute
    while (1)
    {
      if (digitalRead(hr) == HIGH)
      {
        mint1 = mint1 + 1;
        if ( mint1 > 60)
        {
          mint1 = 0;
        }

        if ( mint1 <= 9)
        {
          lcd.setCursor(8, 1);
          lcd.print(0);
          lcd.setCursor(9, 1);
          lcd.print(mint1);
          delay(300);
        }
        else if (mint1 >= 10)
        {
          lcd.setCursor(8, 1);
          lcd.print(mint1);
          delay(300);
        }
      }
      else if ( digitalRead(mint) == HIGH && mint1 >= 0 )
      {
        mint1 = mint1 - 1;
        if ( mint1 <= 9 )
        {
          lcd.setCursor(8, 1);
          lcd.print(0);
          lcd.setCursor(9, 1);
          lcd.print(mint1);
          delay(300);
        }
        else if ( mint1 >= 10)
        {
          lcd.setCursor(8, 1);
          lcd.print(mint1);
          lcd.setCursor(9, 1);
          lcd.print(0);
          delay(300);
        }
      }
      // if we want break mintes setting press last greaan button
      else if ( digitalRead(start) == HIGH && mint1 > 0 )
      {
        break;
      }
    }
    lcd.setCursor(0, 0);
    lcd.print("PLZ Wait Till 00 ");
    for (int i = mint1; i > 0; i-- )
    {
      digitalWrite(led, HIGH);
      for ( int j = 1 * 59; j >= 0; j-- )
      {
        if ( i > 10)
        {
          lcd.setCursor(8, 1);
          lcd.print(i - 1);
        }
        else
        {
          lcd.setCursor(8, 1);
          lcd.print(0);
          lcd.setCursor(9, 1);
          lcd.print(i - 1);
        }

        if ( j > 9 )
        {
          lcd.setCursor(13, 1);
          lcd.print(j);
          delay(1000);
        }
        else if ( j <= 9  )
        {
          lcd.setCursor(13, 1);
          lcd.print(0);
          lcd.setCursor(14, 1);
          lcd.print(j);
          delay(1000);
        }

      }

    }
    if ( hr1 > 0)
    {
      for ( int h = hr1; h > 0; h--)
      {
        digitalWrite(led, HIGH);
        for (int i = 1 * 59; i > 0; i-- )
        {
          for ( int j = 1 * 59; j >=0 ; j-- )
          {
            if ( i <= 9 )
            {
              lcd.setCursor(8, 1);
              lcd.print(0);
              lcd.setCursor(9, 1);
              lcd.print(i);
            }
            else if (i >= 10 )
            {
              lcd.setCursor(8, 1);
              lcd.print(i);
            }
            if ( h == 1)
            {
              lcd.setCursor(6, 1);
              lcd.print(0);
            }
            if ( j > 9 )
            {
              lcd.setCursor(13, 1);
              lcd.print(j);
              delay(1000);
            }
            else if ( j <= 9 )
            {
              lcd.setCursor(13, 1);
              lcd.print(0);
              lcd.setCursor(14, 1);
              lcd.print(j);
              delay(1000);
            }
          }
        }
      }
    }
  }
  digitalWrite(led, LOW);
  mint1 = 0;
  hr1 = 0;
}