//https://miliohm.com/keypad-with-arduino-tutorial/
#include <Keypad.h>
#include <LiquidCrystal.h>
#define led_pin 1//to unlock and lock
// initialize the LCD
LiquidCrystal lcd(A5, 2, 3, 4, 5, 6);
String pad;
const byte numRows = 4; // set display to 4 rows
const byte numCols = 3; // set display to 3 columns
String password = "4321";
char keypressed;

char keymap[numRows][numCols] =
{{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}};
//------------------------------------------------------------

byte rowPins[numRows] = {7, 8, 9, 10};
byte colPins[numCols] = {11, 12, 13};
Keypad myKeypad = Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols); //mapping keypad

void setup () {
      lcd.begin(16, 2);
      lcd.print("Enter Number:");
      delay(3000);
      lcd.clear();
      lcd.cursor();
      lcd.blink();
      pinMode(led_pin, OUTPUT);
      digitalWrite(led_pin, HIGH);
      delay(1000);
      digitalWrite(led_pin, LOW);
}

void loop() {
  // put your main code here, to run repeatedly:
  readKeypad();
  if (keypressed == '#') {
    if (pad == password) {
      lcd.setCursor(0, 1);
      lcd.print("Access Granted");
      lcd.noBlink();
      digitalWrite(led_pin, HIGH);
      delay(2000);
      lcd.setCursor(0, 0);
      pad = "";
      lcd.clear();
      
    } else {
      lcd.setCursor(0, 1);
      lcd.print("Access Denied");
      digitalWrite(led_pin, LOW);
      lcd.noBlink();
      delay(1000);
      lcd.setCursor(0, 0);
      pad = "";
      lcd.clear();
      
    }
  } if (keypressed == '*') {
    pad = "";
    lcd.clear();
  }
  lcd.setCursor(0, 0);
  lcd.print(pad);
  delay(100);
}
void readKeypad() {
  keypressed = myKeypad.getKey(); //deteksi penekanan keypad
  if (keypressed != '#') {
    String konv = String(keypressed);
    pad += konv;
  }
}