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if (!reached_maximum_retries) { // if did not reach maximum number of retry
    char key = keypad.getKey();   //waiting for keyboard input (non blocking)
    if (key != NO_KEY){           //if press a key
      beep();
      delay(30);                  //debounce
      if (key == '#')  enterPasswordForMenu();     //require to enter password before proceed to menu selection
      else enterPasswordToRelease_DoorLock(key);   //otherwise proceed to enterPasswordToRelease_DoorLock routine
     }
  }

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void resetRetryCount() {
    retryCount = 0;                   //reset retry count
    reached_maximum_retries = false;  // enable keyboard input
    welcome();
} 

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 if (retryCount > 0) { //if someone have entered wrong password
    if (millis() >= previousMillis + AUTO_RESET_RETRY_COUNT * 60000) { 
      resetRetryCount();
    }
  }

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void runEventAnyTime() {
  // press a switch to release door lock without enter password
  press_release_lock_switch();
  // press a switch to ring the bell
  press_bell_switch();
  // read tag & release door lock if verified
  read_RFID();
}

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void loop(){
  runEventAnyTime(); // codes inside runEventAnyTime() will keep on updating
  print_date_time();
  // retryCount increase by one each time an incorrect password has been entered
  // retryCount will reset to zero when idle for one minute (set by AUTO_RESET_RETRY_COUNT)
  if (retryCount > 0) { //if someone have entered wrong password
    if (millis() >= previousMillis + AUTO_RESET_RETRY_COUNT * 60000) { 
      resetRetryCount();
    }
  }

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void loadConfiguration() {
  eeprom_read_string(USER_PASSWORD_EEPROM_ADDRESS, buf, maxPasswordLength + 1);  //read USER password from EEPROM
    userPassword = buf;   //use this password to release door lock
  eeprom_read_string(ADMIN_PASSWORD_EEPROM_ADDRESS, buf, maxPasswordLength + 1); //read ADMIN password from EEPROM
    adminPassword = buf;  //use this password to enter menu selection
}

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void initializeEEPROM(){
  strcpy(buf, "1234"); //set password to 1234
  eeprom_write_string(USER_PASSWORD_EEPROM_ADDRESS, buf);  //write password to EEPROM
  strcpy(buf, "1234"); //set password to 1234
  eeprom_write_string(ADMIN_PASSWORD_EEPROM_ADDRESS, buf); //write password to EEPROM
  DEBUG_PRINTLN("Initialize completed");
  lcd.clear();
  lcd.print("Initialized.");
  delay(1000);
  playOKTone();

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void reset_settings() {
  unsigned long start_hold = millis();                 // mark the time
  int HOLD_DELAY = 5000;    // Sets the hold delay 
  DEBUG_PRINTLN("Please keep on pressing for 5 sconds.");
  while (sw_state == LOW) {
    sw_state = digitalRead(RESET_SETTINGS_PIN );      // read input value
    if ((millis() - start_hold) >= HOLD_DELAY){      // for longer than HOLD_DELAY
      //initialize_is_running = true;  // keep loop running even though RESET_SETTINGS_PIN  is low
      initializeEEPROM();
      break; //break the loop after initialized

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// Sample code for I2C/TWI LCD1602 Module
// read data from serial port & print to LCD
// Compatible with the Arduino IDE 1.0
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
 
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display
 
String inputString = "";         // a string to hold incoming data
boolean stringComplete = false;  // whether the string is complete

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//Sample code for I2C/TWI LCD1602 Module
//Compatible with the Arduino IDE 1.0
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>
 
LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display
 
String myString = "ediy.com.my"; 
int myInteger = 123;
float myFloat = 123.45;