Arduino Code Keypad Lock

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#include <Servo.h>

#include <LiquidCrystal_I2C.h>

#include <Keypad.h>

#include <Password.h>


#define buzzer 11


Servo servo;

LiquidCrystal_I2C lcd(0x27, 16, 2);


String newPasswordString; //hold the new password

char newPassword[6]; //charater string of newPasswordString

byte a = 5;

bool value = true;


Password password = Password("0123"); //Enter your password


byte maxPasswordLength = 6;

byte currentPasswordLength = 0;

const byte ROWS = 4; // Four rows

const byte COLS = 4; // Four columns



char keys[ROWS][COLS] = {

  {'D', 'C', 'B', 'A'},

  {'#', '9', '6', '3'},

  {'0', '8', '5', '2'},

  {'*', '7', '4', '1'},

};



byte rowPins[ROWS] = {2, 3, 4, 5};

byte colPins[COLS] = {6, 7, 8, 9};


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



void setup() {

  

  Serial.begin(9600);

  pinMode(buzzer, OUTPUT);

  servo.attach(10);

  servo.write(50);

  lcd.init();

  lcd.backlight();

  lcd.setCursor(3, 0);

  lcd.print("WELCOME TO");

  lcd.setCursor(0, 1);

  lcd.print("DOOR LOCK SYSTEM");

  delay(3000);

  lcd.clear();

}


void loop() {

  lcd.setCursor(1, 0);

  lcd.print("ENTER PASSWORD");


  char key = keypad.getKey();

  if (key != NO_KEY) {

    delay(60);

    if (key == 'C') {

      resetPassword();

    } else if (key == 'D') {

      if (value == true) {

        doorlocked();

        value = false;

      } else if (value == false) {

        dooropen();

        value = true;

      }

    } else {

      processNumberKey(key);

    }

  }

}


void processNumberKey(char key) {

  lcd.setCursor(a, 1);

  lcd.print("*");

  a++;

  if (a == 11) {

    a = 5;

  }

  currentPasswordLength++;

  password.append(key);


  if (currentPasswordLength == maxPasswordLength) {

    doorlocked();

    dooropen();


  }

}


void dooropen() {

  if (password.evaluate()) {

    digitalWrite(buzzer, HIGH);

    delay(300);

    digitalWrite(buzzer, LOW);

    servo.write(50);

    delay(100);

    lcd.setCursor(0, 0);

    lcd.print("CORRECT PASSWORD");

    lcd.setCursor(0, 1);

    lcd.print("DOOR OPENED");

    delay(2000);

    lcd.clear();

    a = 5;

  } else {

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    lcd.setCursor(0, 0);

    lcd.print("WRONG PASSWORD!");

    lcd.setCursor(0, 1);

    lcd.print("PLEASE TRY AGAIN");

    delay(2000);

    lcd.clear();

    a = 5;

  }

  resetPassword();

}


void resetPassword() {

  password.reset();

  currentPasswordLength = 0;

  lcd.clear();

  a = 5;

}


void doorlocked() {

  if (password.evaluate()) {

    digitalWrite(buzzer, HIGH);

    delay(300);

    digitalWrite(buzzer, LOW);

    servo.write(110);

    delay(100);

    lcd.setCursor(0, 0);

    lcd.print("CORRECT PASSWORD");

    lcd.setCursor(2, 1);

    lcd.print("DOOR LOCKED");

    delay(2000);

    lcd.clear();

    a = 5;

  } else {

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    digitalWrite(buzzer, HIGH);

    delay(200);

    digitalWrite(buzzer, LOW);

    delay(200);

    lcd.setCursor(0, 0);

    lcd.print("WRONG PASSWORD!");

    lcd.setCursor(0, 1);

    lcd.print("PLEASE TRY AGAIN");

    delay(2000);

    lcd.clear();

    a = 5;

  }

  resetPassword();

}

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