#include <Keypad.h>
#include <Servo.h>
 
// Define the password
const String password = "1234"; // Change this to your desired password
String input = "";
 
// Setup servo
Servo lockServo;
const int servoPin = 9;
const int lockedPos = 0;    // degrees
const int unlockedPos = 90; // degrees
 
// Keypad setup
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] = {2, 3, 4, 5};   // Connect to R1-R4 of keypad
byte colPins[COLS] = {6, 7, 8, 10};  // Connect to C1-C4 of keypad
 
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
 
void setup() {
  Serial.begin(9600);
  lockServo.attach(servoPin);
  lockServo.write(lockedPos); // Lock position
  Serial.println("Enter Password:");
}
 
void loop() {
  char key = keypad.getKey();
 
  if (key) {
    Serial.print(key);
 
    if (key == '#') {
      if (input == password) {
        Serial.println("\nAccess Granted!");
        unlock();
      } else {
        Serial.println("\nAccess Denied!");
        lock();
      }
      input = ""; // Clear input after check
    }
    else if (key == '*') {
      input = ""; // Clear input on '*'
      Serial.println("\nInput Cleared");
    }
    else {
      input += key;
    }
  }
}
 
void unlock() {
  lockServo.write(unlockedPos);
  delay(5000); // Stay unlocked for 5 seconds
  lock();
}
 
void lock() {
  lockServo.write(lockedPos);
}
 

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