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

// Define the keypad layout
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; // Connect keypad row pins to these Arduino pins
byte colPins[COLS] = {5, 4, 3, 2}; // Connect keypad column pins to these Arduino pins
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Define the LCD address and number of columns and rows
const int LCD_ADDR = 0x27;
const int LCD_COLS = 16;
const int LCD_ROWS = 2;
LiquidCrystal_I2C lcd(LCD_ADDR, LCD_COLS, LCD_ROWS);
  int k=0;
  int second=0;
  int tab[50];
void setup() {
    pinMode(10, OUTPUT);
  // Initialize the keypad and LCD
  keypad.setDebounceTime(50);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Enter Les seconds");
}
void loop() {
  int a;
  char customKey = keypad.getKey();
  int i;
  if(customKey){
    if(customKey != 'A'){
  lcd.setCursor(k, 1);
  if (customKey =='0')
     a=0;
  if (customKey =='1')
     a=1;
  if (customKey =='2')
      a=2;
    if (customKey =='3')
    a=3;
    if (customKey =='4')
    a=4;
    if (customKey =='5')
    a=5;
    if (customKey =='6')
    a=6;
    if (customKey =='7')
     a=7;
    if (customKey =='8')
     a=8;
    if (customKey =='9')
     a=9;
      lcd.print(a);
    tab[k]=a;
    k++;
  }
   else  if(customKey == 'A'){
      for(i=0;i<k;i++)
       second+=tab[i]*pow(10,k-i-1);
       for(second;second>=0;second--){
            lcd.clear();
            lcd.print("rest time");
            lcd.setCursor(0,1);
            lcd.print(second);
            delay(1000);
        }
        tone(10,2620,5000);
            lcd.clear();
            for(i=0;i<5;i++){
            lcd.clear();
            lcd.print("alarme is active");
            lcd.setCursor(0,1);
            lcd.print("stop after ");
            lcd.print(5-i);
            delay(1000);  
        }
  lcd.clear();
  lcd.print("Enter Les seconds");
  lcd.setCursor(0,1);
  k=0;
  }  
  }  
  }