#include <Keypad.h>
#include <Wire.h>
#include <Servo.h>
#include <LiquidCrystal_I2C.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define SERVO_PIN 10

Servo doorServo;

LiquidCrystal_I2C lcd(0x27,16,2);

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
Adafruit_SSD1306 oled(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

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] = {5,4,3,2};

Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

String password = "2005";
String input = "";

void setup() {

Serial.begin(9600);

doorServo.attach(SERVO_PIN);
doorServo.write(0);   // Door locked

lcd.init();
lcd.backlight();

oled.begin(SSD1306_SWITCHCAPVCC, 0x3C);
oled.clearDisplay();

lcd.setCursor(0,0);
lcd.print("Enter Password");

}

void loop() {

char key = keypad.getKey();

if(key) {

input += key;

lcd.setCursor(0,1);
lcd.print(input);

oled.clearDisplay();
oled.setTextSize(1);
oled.setTextColor(WHITE);
oled.setCursor(0,20);
oled.print("Input: ");
oled.print(input);
oled.display();

}

if(input.length() == 4) {

if(input == password) {

lcd.clear();
lcd.print("Door Open");

doorServo.write(90);

oled.clearDisplay();
oled.setCursor(0,20);
oled.print("Door OPEN");
oled.display();

delay(5000);

doorServo.write(0);

}
else {

lcd.clear();
lcd.print("Wrong Password");

oled.clearDisplay();
oled.setCursor(0,20);
oled.print("Access Denied");
oled.display();

delay(2000);

}

input = "";
lcd.clear();
lcd.print("Enter Password");

}

}