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

LiquidCrystal_I2C lcd(0x27,16,2);
char password[6];
char pass[6],pass1[6];
int i=0;
char customKey=0;
const byte ROWS = 4; 
const byte COLS = 4; 
char hexaKeys[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 customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 
void setup()
{
  pinMode(12,OUTPUT);
  pinMode(13,OUTPUT);
  lcd.begin(16, 2);
  

  lcd.print("Masukan Password:");
  lcd.setCursor(0,1);
  for(int j=0;j<6;j++)
  EEPROM.write(j, j+49);
  for(int j=0;j<6;j++)
  pass[j]=EEPROM.read(j);
}
  
void loop()
{
  customKey = customKeypad.getKey();
  if(customKey=='#')
  change();
  if (customKey)
  {
     password[i++]=customKey;
     lcd.print(customKey);
  }
  if(i==6)
  {
    delay(200);
    for(int j=0;j<6;j++)
    pass[j]=EEPROM.read(j);
    if(!(strncmp(password, pass,6)))
    {
      lcd.clear();
      lcd.print(" Password  Anda ");
      lcd.setCursor(0,1);
      lcd.print("     Benar     ");
      digitalWrite(13,HIGH);
      delay(3000);
      digitalWrite(13,LOW);
      lcd.clear();
      lcd.print("ACHMAD SYAIFUDIN");
      lcd.setCursor(0,1);
      lcd.print("  191020100076  ");
      delay(5000);
      lcd.clear();
      lcd.print("Masukan Password:");
      lcd.setCursor(0,1);
      i=0;
    }
    
    else
    {
      lcd.clear();
      lcd.print(" Password  Anda ");
      lcd.setCursor(0,1);
      lcd.print("     Salah     ");
      digitalWrite(12,HIGH);
      delay(3000);
      digitalWrite(12,LOW);
      lcd.clear();
      lcd.print("Masukan Password:");
      lcd.setCursor(0,1);
      i=0;
    }
  }
}
void change()
{
  int j=0;
  lcd.clear();
  lcd.print("Password Lama :");
  lcd.setCursor(0,1);
  while(j<6)
  {
    char key=customKeypad.getKey();
    if(key)
    {
      pass1[j++]=key;
      lcd.print(key);
      
    }
    key=0;
  }
  delay(500);
  
  if((strncmp(pass1, pass, 6)))
  {
    lcd.clear();
    lcd.print("Password Salah");
    lcd.setCursor(0,1);
    lcd.print("Coba Lagi");
    delay(1000);
  }
  else
  {
    j=0;
    
    lcd.clear();
    lcd.print("Password Baru :");
    lcd.setCursor(0,1);
    while(j<6)
  {
    char key=customKeypad.getKey();
    if(key)
    {
      pass[j]=key;
      lcd.print(key);
      EEPROM.write(j,key);
      j++;
     
    }
  }
  lcd.clear();
    lcd.print("Password Baru :");
    lcd.setCursor(0,1);
    lcd.print("  Tersimpan  ");
  delay(2000);
  }
  lcd.clear();
  lcd.print("Masukan Password:");
  lcd.setCursor(0,1);
  customKey=0;
}