#include <Keypad.h>

// Define the keypad buttons and pins
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};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// Define the mobile numbers to be stored
char mobileNumbers[10][11] = {
  "1234567890",
  "2345678901",
  "3456789012",
  "4567890123",
  "5678901234",
  "6789012345",
  "7890123456",
  "8901234567",
  "9012345678",
  "0123456789"
};

int found=0;

void setup() {
  Serial.begin(9600);
  digitalWrite(11, LOW);
  digitalWrite(12, LOW);
  digitalWrite(10, LOW);
}

void loop() {
  digitalWrite(12, HIGH);
  char inputNumber[11] = "";
  int index = 0;

  while (index < 10) {
    char key = keypad.getKey();
    
    if (key != NO_KEY && key != '*' && key != '#') {
      inputNumber[index] = key;
      index++;
      Serial.print(key);
    }
    
    if (key == '#') {
      break;
    }
  }
  
  for (int i = 0; i < 10; i++) {
    if (strcmp(mobileNumbers[i], inputNumber) == 0) {
      Serial.println("\nMobile number found!");
      digitalWrite(10, HIGH);
      digitalWrite(11, LOW);
      found=1;
      digitalWrite(12, LOW);
      break;
    }
    
    if (i == 9) {
      Serial.println("\nMobile number not found!");
      digitalWrite(11, HIGH);
      digitalWrite(10, LOW);
      found=0;

      setup();
    }
  }
  
  delay(500);
}