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

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
const byte ROWS = 4;
const byte COLS = 4;
char keys[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] = {A3, A2, A1, A0};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
Servo myServo;
const int ledPin = 13;
const String password = "1234";
String inputPassword = "";

void setup() {
  myServo.attach(10);
  myServo.write(0);
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  lcd.begin(16, 2);
  lcd.print("System Ready");   
  delay(1500);
  lcd.clear(); 
  lcd.print("Enter Password:");
}

void loop() {
  char key = keypad.getKey();
  if (key) {
    if (key == '#') {
      if (inputPassword == password) {
        correctPassword();
      } else {
        incorrectPassword();
      }
      inputPassword = "";
    } else if (key == '*') {
      inputPassword = "";
      lcd.clear(); //
      lcd.print("Enter Password:"); 
    } else {
      inputPassword += key;
      lcd.setCursor(0, 1); 
      lcd.print(inputPassword);
    }
  }
}

void correctPassword() {
  lcd.clear(); 
  lcd.print("Access Granted"); 
  digitalWrite(ledPin, HIGH); 
  myServo.write(90); 
  delay(180); 
  myServo.write(0); 
  digitalWrite(ledPin, LOW); 
  lcd.clear(); 
  lcd.print("Enter Password:"); 
}

void incorrectPassword() {
  lcd.clear(); 
  lcd.print("Access Denied"); 
  digitalWrite(ledPin, LOW); 
  delay(180); 
  lcd.clear(); 
  lcd.print("Enter Password:"); 
}
{
  "version": 1,
  "author": "Anonymous maker",
  "editor": "wokwi",
  "parts": [
    { "type": "wokwi-arduino-uno",
      "id": "uno", 
      "top": 10.2, 
      "left": -19.8, 
      "attrs": {} },
    {
      "type": "wokwi-lcd1602",
      "id": "lcd",
      "top": -236.57,
      "left": -3.2,
      "attrs": { "pins": "[\"RS\",\"E\",\"D4\",\"D5\",\"D6\",\"D7\"]" }
    },
    { 
      "type": "wokwi-membrane-keypad", 
      "id": "keypad1", 
      "top": -40.4, 
      "left": 360.8, 
      "attrs": {} },
    { 
      "type": "wokwi-servo", 
      "id": "servo1", 
      "top": -69.2, 
      "left": -278.4, 
      "attrs": {} 
      },
    { "type": "wokwi-led", 
      "id": "led1", 
      "top": -70.8, 
      "left": 80.6, 
      "attrs": 
      { "color": "red" } 
      }
  ],
  "connections": [
    [ "uno:12", "lcd:RS", "green", [ "v0" ] ],
    [ "uno:11", "lcd:E", "green", [ "v0" ] ],
    [ "uno:5", "lcd:D4", "green", [ "v0" ] ],
    [ "uno:4", "lcd:D5", "green", [ "v0" ] ],
    [ "uno:3", "lcd:D6", "green", [ "v0" ] ],
    [ "uno:2", "lcd:D7", "green", [ "v0" ] ],
    [ "uno:9", "keypad1:R1", "green", [ "v0" ] ],
    [ "uno:8", "keypad1:R2", "green", [ "v0" ] ],
    [ "uno:7", "keypad1:R3", "green", [ "v0" ] ],
    [ "uno:6", "keypad1:R4", "green", [ "v0" ] ],
    [ "uno:A3", "keypad1:C1", "green", [ "v0" ] ],
    [ "uno:A2", "keypad1:C2", "green", [ "v0" ] ],
    [ "uno:A1", "keypad1:C3", "green", [ "v0" ] ],
    [ "uno:A0", "keypad1:C4", "green", [ "v0" ] ],
    [ "uno:GND.1", "servo1:GND", "black", [ "v-38.4", "h-287.7" ] ],
    [ "uno:10", "servo1:PWM", "green", [ "v0" ] ],
    [ "uno:5V", "servo1:V+", "red", [ "v0" ] ],
    [ "led1:A", "uno:13", "green", [ "v0" ] ],
    [ "led1:C", "uno:GND.1", "green", [ "v0" ] ]
  ],
  "dependencies": {}
}