#include <Keypad.h>
#include <LiquidCrystal.h>

const int ROW_NUM    = 4; // four rows
const int COLUMN_NUM = 4; // four columns
char keys[ROW_NUM][COLUMN_NUM] = {
  {'1','2','3', 'A'},
  {'4','5','6', 'B'},
  {'7','8','9', 'C'},
  {'*','0','#', 'D'}
};
byte pin_rows[ROW_NUM] = {10 ,9, 8, 7};      // connect to the row pinouts of the keypad
byte pin_column[COLUMN_NUM] = {6, 5, 4, 3}; // connect to the column pinouts of the keypad

Keypad customKeypad = Keypad(makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
const int BUZZER_PIN = 12;




void setup () {
  pinMode(BUZZER_PIN, OUTPUT);

}

void loop () {
  char customKey = customKeypad.getKey();
  if (customKey) {
    tone(BUZZER_PIN, 750, 100); // make a beep sound
  }
  if (customKey) {
     if (customKey != NO_KEY) {
       //Serial.print(customKey);
       Serial.print("Enter your PhoneNo.: "); 
       class String PhoneString = "";                   
       char PhoneKey = customKeypad.getKey();
       if (PhoneKey) {              
         // Initialize if a key is pressed
          Serial.print(PhoneKey);
          PhoneString += PhoneKey; // Append the entered digit to the age string
          Serial.print(PhoneString);
           if (PhoneString.length() == 11) {              // If the age string has two digits, categorize the age
            
            Serial.print("Your Phone is: ");
            Serial.print(PhoneString);
           //delay(1000); 
           // Convert the age string to an integer
            int Phone = PhoneString.toInt(); 
           //lastKeypressTime = 0;
           //if (millis() -lastKeypressTime > 10000) {  
            PhoneString = "";
            delay(1000);
             // Age3();
           } 
        } 


      }
     
    
  }
}