/*#include <Keypad.h>
#include <LiquidCrystal_I2C.h>      // Khai báo thư viện LCD sử dụng I2C
#include <Wire.h>
#include <EEPROM.h>

#define BUZZER_PIN 12
#define LED_PIN 13

LiquidCrystal_I2C lcd(0x27, 16, 2); // 0x27 địa chỉ LCD, 16 cột và 2 hàng

const byte rows = 4; //số hàng
const byte columns = 4; //số cột

char STR[4] = {'1', '2', '3', '4'}; // Cài đặt mật khẩu tùy ý
char str[4] = {' ', ' ', ' ', ' '};
int i = 0, j = 0, count = 0;
int countFailedPassword = 0;
int countFailedFingerPr = 0;
bool passwordTrue = false;
bool fingerTrue = false;

//Định nghĩa các giá trị trả về
char keys[rows][columns] =
{
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'},
};

byte rowPins[rows] = {2, 3, 4, 5}; //Cách nối chân với Arduino
byte columnPins[columns] = {15, 16, 17, 18};

//cài đặt thư viện keypad
Keypad keypad = Keypad(makeKeymap(keys), rowPins, columnPins, rows, columns);
void setup() {
  Serial.begin(9600);//bật serial, baudrate 9600=
  lcd.init();        // Khai báo sử dụng LCD
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.clear();
  lcd.print(" Enter Password");
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);

}
void loop() {
  char key = keypad.getKey();

  if (key != NO_KEY) {
    buzzerBeep();
    Serial.println(key);
    // for (i ==0; i<4;i++){
    //   str[0] = key;
    //   lcd.setCursor(6, i);
    //   lcd.print(str[0]);
    //   delay(500);
    //   lcd.setCursor(6, i);
    //   lcd.print("*");
    // }
    // Nhập mật khẩu
    if (i == 0) {
      str[0] = key;
      lcd.setCursor(6, 1);
      lcd.print(str[0]);
      delay(500); // Ký tự hiển thị trên màn hình LCD trong 1s
      lcd.setCursor(6, 1);
      lcd.print("*"); // Ký tự được che bởi dấu *
    }
    if (i == 1) {
      str[1] = key;
      lcd.setCursor(7, 1);
      lcd.print(str[1]);
      delay(500);
      lcd.setCursor(7, 1);
      lcd.print("*");
    }
    if (i == 2) {
      str[2] = key;
      lcd.setCursor(8, 1);
      lcd.print(str[2]);
      delay(500);
      lcd.setCursor(8, 1);
      lcd.print("*");
    }
    if (i == 3) {
      str[3] = key;
      lcd.setCursor(9, 1);
      lcd.print(str[3]);
      delay(500);
      lcd.setCursor(9, 1);
      lcd.print("*");
      count = 1;
    }
    i = i + 1;
  }

  if (count == 1) {
    if (str[0] == STR[0] && str[1] == STR[1] && str[2] == STR[2] &&
        str[3] == STR[3]) {
      lcd.clear();
      lcd.print("    Correct!");
      buzzerTruePassword();
      countFailedPassword = 0;
      passwordTrue = true;
      digitalWrite(LED_PIN, HIGH);
      delay(5000);
      digitalWrite(LED_PIN, LOW);
      lcd.clear();
      lcd.print("     Closed!");
      delay(2000);
      lcd.clear();
      lcd.print(" Enter Password");
      i = -1;
      // lcd.clear();
      // lcd.print("   *: Open");
      // if(key != NO_KEY){
      // if (key == '*'){
      //     digitalWrite(LED_PIN, HIGH);
      // }
      // }
      // delay(5000);
      // lcd.clear();
      // lcd.print(" Enter Password");
      // digitalWrite(LED_PIN, LOW);

      i = 0;
      count = 0;
    } else {
      lcd.clear();
      lcd.print("   Incorrect!");
      buzzerFailedPassword();
      countFailedPassword++;
      // Serial.println(countFailedPassword);
      if (countFailedPassword >= 3) {
        buzzerLongBeep();
      }
      delay(1000);
      lcd.clear();
      lcd.print("   Try Again!");
      delay(2000);
      lcd.clear();
      lcd.print(" Enter Password");
      i = 0;
      count = 0;
    }
  }



  //  if (passwordTrue){
  //   lcd.clear();
  //   lcd.print("   *: Open");
  //   if (key == '*'){
  //     digitalWrite(LED_PIN, HIGH);
  //   }
  //   lcd.clear();
  //   lcd.print(" Enter Password");
  //   digitalWrite(LED_PIN, LOW);
  //  }

  // void changePassword(){
  //   lcd.clear();
  //   lcd.setCursor(0,0);
  //   lcd.print("Enter new password:");
  //   while(1){
  //     char key = keypad.getKey();
  //     if(key != NO_KEY){

  //     }
  //   }
 
}

void buzzerBeep() {
  tone(BUZZER_PIN, 1000, 100);
}

void buzzerTruePassword() {
  tone(BUZZER_PIN, 1000, 100);
  delay(200);
  tone(BUZZER_PIN, 1000, 100);
}
// Hàm kêu buzzer khi nhập sai mật khẩu
void buzzerFailedPassword() {
  for (int i = 0; i < 3; i++) {
    tone(BUZZER_PIN, 1500, 200);
    delay(300);
  }
}

// Hàm kêu buzzer khi nhập đúng mật khẩu
void buzzerLongBeep() {
  for (int i = 0; i < 10; i++) {
    tone(BUZZER_PIN, 1500, 500);
    delay(600);
  }
}
*/


//--------------------------------Include-------------------------------------------//
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>      // Khai báo thư viện LCD sử dụng I2C
#include <Wire.h>
#include <EEPROM.h>
//----------------------------------------------------------------------------------//

LiquidCrystal_I2C lcd(0x27, 16, 2); // 0x27 địa chỉ LCD, 16 cột và 2 hàng
//----------------------------------------------------------------------------------//
#define BUZZER_PIN 12
#define LED_PIN 13
#define PASSWORD_LENGTH 4
#define EEPROM_ADDRESS 0
//----------------------------------------------------------------------------------//

//--------------------------------Variable------------------------------------------//
const byte rows = 4; //số hàng
const byte columns = 4; //số cột
int i= 0;
char key_pressed=0;
char password[4];
char initial_password[4],new_password[4];
byte rowPins[rows] = {2, 3, 4, 5}; //Cách nối chân với Arduino
byte columnPins[columns] = {15, 16, 17, 18};
char keys[rows][columns] =
{
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', ' '},
};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, columnPins, rows, columns);
//----------------------------------------------------------------------------------//

//----------------------------------------------------------------------------------//
void setup() {
  Serial.begin(9600);//bật serial, baudrate 9600=
  lcd.init();        // Khai báo sử dụng LCD
  lcd.begin(16, 2);
  lcd.backlight();
  lcd.clear();
  lcd.print(" Enter Password");
  pinMode(BUZZER_PIN, OUTPUT);
  pinMode(LED_PIN, OUTPUT);
  lcd.setCursor(0,1);
  initialpassword();
  Serial.println(EEPROM.read(0));
  Serial.println(EEPROM.read(1));
  Serial.println(EEPROM.read(2));
 Serial.println(EEPROM.read(3));
 Serial.println(initial_password[0]);
Serial.println(initial_password[1]);
 Serial.println(initial_password[2]);
 Serial.println(initial_password[3]);
}
//----------------------------------------------------------------------------------//
void loop(){
key_pressed = keypad.getKey();
if(key_pressed=='#')
change();
if (key_pressed)
{
password[i]=key_pressed;
Serial.println(i);
Serial.println(key_pressed);
lcd.print(key_pressed);
i++;
}
if(i==4)
{
delay(200);
for(int j=0;j<4;j++)
initial_password[j]=EEPROM.read(j);
if(!(strncmp(password, initial_password,4))){
lcd.clear();
lcd.print("Pass Accepted");
delay(2000);
lcd.setCursor(0,0);
lcd.print("Pres >START< to");
lcd.setCursor(0,1);
lcd.print("change the pass");
delay(3000);
lcd.clear();
lcd.print("Enter Password:");
lcd.setCursor(0,1);
i=0;
}
else{
lcd.clear();
lcd.print("Wrong Password");
lcd.setCursor(0,0);
lcd.print("Pres >#< to");
lcd.setCursor(0,1);
lcd.print("change the pass");
delay(2000);
lcd.clear();
lcd.print("Enter Password");
lcd.setCursor(0,1);
i=0;
}}}


void change(){
  int j=0;
lcd.clear();
lcd.print("Current Password");
lcd.setCursor(0,1);
while(j<4){
char key=keypad.getKey();
if(key)
{
new_password[j++]=key;
lcd.print(key);
}
key=0;}
delay(500);

if((strncmp(new_password, initial_password, 4))){
lcd.clear();
lcd.print("Wrong Password");
lcd.setCursor(0,1);
lcd.print("Try Again");
delay(1000);}

else{
j=0;
lcd.clear();
lcd.print("New Password:");
lcd.setCursor(0,1);

while(j<4){
char key=keypad.getKey();
if(key)
{
initial_password[j]=key;
lcd.print(key);
EEPROM.write(j,key);
j++;}}
lcd.print("Pass Changed");
delay(1000);}
lcd.clear();
lcd.print("Enter Password");
lcd.setCursor(0,1);
key_pressed=0;
}

void initialpassword(){
int j;
for(j=0;j<4;j++)
EEPROM.write(j,0);
for(j=0;j<4;j++)
initial_password[j]=EEPROM.read(j);}