#include <LiquidCrystal.h>
#include <Keypad.h>
#include <Servo.h>


Servo servo1;

const uint8_t Rows = 4;
const uint8_t Cols = 4;

char Keys[Rows][Cols]={

       {'1','2','3','A'},
       {'4','5','6','B'},
       {'7','8','9','C'},
       {'*','0','#','D'}       

};

byte rowPins[Rows] = {A3, A2, A1, A0}; // Pins connected to keypad rows
byte colPins[Cols] = {5, 4, 3, 2}; // Pins connected to keypad columns

Keypad keypad = Keypad(makeKeymap(Keys), rowPins, colPins, Rows, Cols);

LiquidCrystal LCD (1 , 0 , 13 , 12 , 11 , 10); // rs , e , d4 , b5 , d6, d7

const char* correctPassword = "1234"; // Set your desired password here (change to a stronger password)
int numTries = 0; // Track the number of attempted entries
const int maxTries = 3; // Maximum allowed attempts before lockout


void setup() {
LCD.begin(16,2);
servo1.attach(9);
pinMode(8, OUTPUT); //buzzer
pinMode(7, OUTPUT); //green
pinMode(6, OUTPUT); //red
}

void loop() {
  char key = keypad.getKey();
  
  if (key) {
     LCD.print(key);
    // Password entry logic with lockout and visual feedback (LED)
    if (numTries < maxTries) {
      static String enteredPassword = ""; // Clear entered password on each new attempt
      enteredPassword += key;

      if (enteredPassword.length() == strlen(correctPassword)) {
        if (enteredPassword == correctPassword) {
          LCD.setCursor(0,1);
          LCD.println(" - Access granted");
          digitalWrite(7, HIGH); // Turn on LED (optional)
          analogWrite(8, HIGH);
          delay(3000); // Simulate successful access action (e.g., door unlock)
          digitalWrite(7, LOW); // Turn off LED (optional)
          analogWrite(8, LOW);
          numTries = 0; // Reset attempt counter
          enteredPassword = ""; // Clear entered password
        } else {
          LCD.setCursor(0,1);
          LCD.println(" - Wrong password");
          numTries++;
        }
      }
    } else {
      LCD.println(" - Maximum attempts reached. System locked.");
      // Implement lockout mechanism here (e.g., delay, alarm)
    }
  }

}