Password Door Lock Using Tinkercad
#include <Servo.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>
#ifndef PASSWORD_H
#define PASSWORD_H
#define MAX_PASSWORD_LENGTH (20)
#define STRING_TERMINATOR '\0'
class Password {
public:
/**
* @brief Construct object in memory, set all variables
*
* @param pass
*/
Password(char* pass);
/**
* @brief Set the password
*
* @param pass
*/
void set(char* pass);
/**
* @brief Evaluate a string, is it equal to the password?
*
* @param pass
* @return true
* @return false
*/
bool is(char* pass);
/**
* @brief Append a char to the guessed password
*
* @param character
* @return true
* @return false
*/
bool append(char character);
/**
* @brief Reset the guessed password, one can guess again
*
*/
void reset();
/**
* @brief Is the current guessed password equal to the target password?
*
* @return true
* @return false
*/
bool evaluate();
//char* getPassword();
//char* getGuess();
//operators
/**
* @brief password using operator =
*/
Password &operator=(char* pass);
/**
* @brief Test password using ==
*/
bool operator==(char* pass);
/**
* @brief Test password using !=
*/
bool operator!=(char* pass);
/**
* @brief Append to currently guessed password using operator <<
*/
Password &operator<<(char character);
private:
char* target;
char guess[ MAX_PASSWORD_LENGTH ];
byte currentIndex;
};
#endif
Password::Password(char* pass) {
set(pass);
reset();
}
void Password::set(char* pass) { target = pass; }
bool Password::is(char* pass) {
byte i = 0;
while (*pass && i < MAX_PASSWORD_LENGTH) {
guess[i] = pass[i];
i++;
}
return evaluate();
}
bool Password::append(char character) {
if (currentIndex + 1 == MAX_PASSWORD_LENGTH) {
return false;
} else {
guess[currentIndex++] = character;
guess[currentIndex] = STRING_TERMINATOR; // ensure a valid c string
}
return true;
}
void Password::reset() {
currentIndex = 0;
guess[currentIndex] = STRING_TERMINATOR;
}
bool Password::evaluate() {
char pass = target[0];
char guessed = guess[0];
for (byte i = 1; i < MAX_PASSWORD_LENGTH; ++i) {
// check if guessed char is equal to the password char
if ((STRING_TERMINATOR == pass) && (STRING_TERMINATOR == guessed)) {
return true; // both strings ended and all previous characters are equal
} else if ((pass != guessed) || (STRING_TERMINATOR == pass) ||
(STRING_TERMINATOR == guessed)) {
return false; // difference OR end of string has been reached
}
// read next char
pass = target[i];
guessed = guess[i];
}
return false; // a 'true' condition has not been met
}
Password& Password::operator=(char* pass) {
set(pass);
return *this;
}
bool Password::operator==(char* pass) { return is(pass); }
bool Password::operator!=(char* pass) { return !is(pass); }
Password& Password::operator<<(char character) {
append(character);
return *this;
}
#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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