#define PASS "314CA"
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
byte colPins[4] = {5, 4, 3, 2};
byte rowPins[4] = {9, 8, 7, 6};
char keys[4][4] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};
bool oc = false, oc1 = true;
int dl = 1;
Keypad pad((char*)keys, rowPins, colPins, 4, 4);
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo servo;
String data = "";
void setup() {
  lcd.init();
  lcd.backlight();
  Serial.begin(9600);
  pinMode(11, INPUT_PULLUP);
  pinMode(12, INPUT_PULLUP);
  servo.attach(10);
}
void loop() {
  char key = pad.getKey();
  if (key)switch (key) {
      case '*':
        if (data.equals(PASS)) {
          oc = true;
          OC();
          lcd.setCursor(0, 0);
          lcd.print("                ");
          lcd.setCursor(5, 0);
          lcd.print("CORRECT");
          delay(500);
          lcd.setCursor(0, 0);
          lcd.print("                ");
          delay(500);
          lcd.setCursor(5, 0);
          lcd.print("CORRECT");
          delay(500);
        }
        else {
          lcd.setCursor(0, 0);
          lcd.print("                ");
          lcd.setCursor(3, 0);
          lcd.print("NO CORRECT");
          delay(500);
          lcd.setCursor(0, 0);
          lcd.print("                ");
          delay(500);
          lcd.setCursor(3, 0);
          lcd.print("NO CORRECT");
          delay(500);
        }
        data = "";
        break;
      case '#':
        data = data.substring(0, data.length() - 1);
        break;
      default :
        if (data.length() < 8)data += key;
        break;
    }
  if (!digitalRead(11))oc = true;
  if (!digitalRead(12))oc = false;
  OC();
  DL();
}
void OC() {
  if (oc != oc1) {
    oc1 = oc;
    lcd.setCursor(0, 1);
    lcd.print("                ");
    lcd.setCursor(5, 1);
    lcd.print(oc ? "OPEN" : "CLOSE");
    servo.write(oc ? 0 : 90);
  }
}
void DL() {
  if (dl != data.length()) {
    dl = data.length();
    lcd.home();
    lcd.print("PASS:           ");
    lcd.setCursor(6, 0);
    for (int i = 0; i < dl; i++)lcd.print('*');
  }
}