Arduino Digital Door Lock

/* @file MultiKey.ino
|| @version 1.0
|| @author Mark Stanley
|| @contact mstanley@technologist.com
||
|| @description
|| | The latest version, 3.0, of the keypad library supports up to 10
|| | active keys all being pressed at the same time. This sketch is an
|| | example of how you can get multiple key presses from a keypad or
|| | keyboard.
|| #
*/

/*This code was modified to create a Digital Door Lock by
 * INDIKA for SETNFIX Youtube channel. visit http://youtube.com/setnfix for more details
 * contact via setnfix@gmail.com.
 */

 /*OPERATION
  * Default password is 1234. then you can unlock using 1234 and pressing # within 8 seconds.
  * the old passwod can be changed by entering default password and press *. if the passwod is correct
  * you can enter new password and save it by pressing *.
  * if the old password is wrong, puwer will be cut off.
  * unlock password is given 8 secinds and change the password is allowed 15 secinds.
  * There is a CUT OFF relay and a power supply relay. you have to press the power on switch to supply the power
  * to the arduino. then the relay will be activated to supply the power.
  * If you have entered a wrong password or at the end of given time perid, CUT OFF relay will be activated and will be
  * disconnnected the power supply.
  * USE 12V BATTER AND THIS CUT OFF RELAY METHOD WILL BE A CAUSED TO KEEP THE BATTERIED LONG TIME.
  * 
  * *************************************************************************
  * YOU NEED
  * *************************************************************************
  * 12V RELAY
  * 4*3 MATRIX KEY PAD
  * 3V/5V RELAY
  * 12V SOLENOID DOOR LOACK
  * PUSH BUTTON SWITCH
  * LEDS,
  * 120OHM, 1K RESISTORS
  * ATMEGA 328P
  * 16MHZ CRYSTAL
  * 22PF CAPACITOR
  * 104PF CAPACITOR
  * D313 TRANSISTOR
  * 2N2222 TRANSISTOR
  * 100UF CAPACITOR
  * ARDUINO UNO BOARD
  * WIRES
  * WIRE CONNECTORS
  * SOLDERINGIRON
  * VERO BOARD
  * BATTERY CASING
  * BATTERIES (12V)
  * 1N4007 DIODE
  * SCREW NAILS
  * NUTS AND BOLTS
  * SPACES
  * 
  * -----------------------------------------
  *YOU CAN GET MORE INFORMATIONS ON
  *------------------------------------------
  *http://www.youtube.com@setnfix
  *https://projecthub.arduino.cc/setnfix
  *http://www.setnfix.com
  *https://www.facebook.com/setnfixofficial
  */

 

#include <Keypad.h>
#include <EEPROM.h>
int ResetRelay = 10; // Connect relay to Reset the unit
int lock = 9; // Connect Door LOCK
const int buzzer = 11; //buzzer to arduino pin 11
long eeAddress = 13; //EEPROM address to start reading from
int Unlock = 12;
int resetDelay = 8000; // 8 seconds given to enter the password

long OldMillis = millis();;

String savedPW = "";
String oldkey="" ;
String PrsKey="";
String defaultPW = "1234#"; //Default password, you can change is the format is xxxx#
String currentPW = "";
int updatePW = 0;

const byte ROWS = 4; //four rows
const byte COLS = 3; //three columns
char keys[ROWS][COLS] = {
{'1','2','3'},
{'4','5','6'},
{'7','8','9'},
{'*','0','#'}
};
byte rowPins[ROWS] = {8, 7, 6, 5}; //connect to the row pinouts of the kpd
byte colPins[COLS] = {4, 3, 2}; //connect to the column pinouts of the kpd

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

unsigned long loopCount;
unsigned long startTime;
String msg;


void setup() {
    Serial.begin(9600);
    loopCount = 0;
    startTime = millis();
    msg = "";
    pinMode(lock, OUTPUT); // DOOR LOCK
    pinMode(ResetRelay,OUTPUT); //RESET RELAY
    pinMode(buzzer, OUTPUT); //BUZZER
    pinMode(Unlock, INPUT); //Unlock switch
      

    // Read the saved Password from EEPROM
    for (int i = 0; i < 5; ++i) {
        savedPW += char(EEPROM.read(eeAddress + i));
        delay(100);
        Serial.println(savedPW);
    }
    

char mychar= savedPW.charAt(4) ;
Serial.println(mychar);

if (mychar == '#') {
  Serial.print("Passowrd found : ");
  currentPW =savedPW ;
  Serial.println(savedPW.length());
  Serial.println(savedPW); } 
else { 
  Serial.print("No password : "); 
  Serial.print(savedPW); 
  currentPW = defaultPW; }
}


void loop() {

// Time to reset*********************
  int CurrentMillis = millis();
  if ((CurrentMillis-OldMillis) >resetDelay){ //off after given seconds
    PasswordFailed();
    Serial.println("Time Out");
  }
  

 
//**********Reading the KEY******************** 
PrsKey = kpd.getKey();
if (PrsKey != NO_KEY) {oldkey += PrsKey;
KeyPress(); // Make buzzer noice
Serial.println(oldkey);}
//**********Reading the KEY_END**************** 





if (updatePW ==0){
  if (PrsKey == "#"){
    if (oldkey==currentPW)  {
    Serial.println("Door is unlocked");
    PasswordOk();
    digitalWrite(lock,HIGH);oldkey="";}
    else{
    Serial.println("Incorrect Password"  );
    PasswordFailed();
    digitalWrite(lock,LOW);
    oldkey="";}  
  
    
  } // End loop

}


if ((PrsKey == "*")&& (updatePW ==0)){ 

  resetDelay = 15000; // Give more time to change the password (15 seconds are given to change the password)
  //String  tempPW = oldkey+= "#";

  oldkey.replace("*", "#");
  
  if (oldkey==currentPW)  {
  Serial.println("Enter New Password");
  updatePW =1;oldkey=""; PrsKey = "0";PasswordOk();}//Password update mode is Activated
  else{
  Serial.println("Incorrect Password"  );
  digitalWrite(lock,LOW);
  Serial.println(oldkey);
  Serial.println(currentPW);
  updatePW =0; //Password update mode is deactivated
  oldkey="";PasswordFailed();}  
  
}


if ((updatePW ==1)&&(PrsKey == "*")){

  if (oldkey.length() == 5){
    oldkey.replace("*", "#");
    currentPW = oldkey ;
                    // Update EEPROM with new password
                for (int i = 0; i < 5; ++i) {
                    EEPROM.update(eeAddress + i, currentPW[i]);
                }
    oldkey = "";
    updatePW =0;
    Serial.println("New Password is saved");
    PasswordOk();
     } else {oldkey="";updatePW =0;Serial.println("Incorrect Format");PasswordFailed();}

}

} //-------------------------End Void LOOP--------------------------------------


void ClearMemory() {
    
    // Clear EEPROM
    for (int i = 0; i < EEPROM.length(); ++i) {
        EEPROM.write(i, 0); // Write 0 to each address
    }
    
    Serial.println("EEPROM cleared.");
}


void KeyPress(){
  tone(buzzer, 2000); // Send 1KHz sound signal... Incresing the value you can get higher sound
  delay(50);        // ...for 1/10 sec
  noTone(buzzer);     // Stop sound...
  delay(50);        // ...for 1/10 sec
}

void PasswordOk(){
  tone(buzzer, 2000); // Send 1KHz sound signal...
  delay(2000);        // ...for 1 sec
  noTone(buzzer); 
}

void PasswordFailed(){
  tone(buzzer, 2000); // Send 1KHz sound signal...
  delay(200);         // ...for 1/10 sec
  noTone(buzzer);     // Stop sound...
  delay(50);         // ...for 1/10 sec
  tone(buzzer, 2000); // Send 1KHz sound signal...
  delay(200);         // ...for 1/10 sec
  noTone(buzzer);     // Stop sound...
  delay(50);         // ...for 1/10 sec
  tone(buzzer, 2000); // Send 1KHz sound signal...
  delay(200);         // ...for 1/10 sec
  noTone(buzzer);     // Stop sound...
  delay(50);         // ...for 1/10 sec
  tone(buzzer, 2000); // Send 1KHz sound signal...
  delay(200);         // ...for 1/10 sec
  noTone(buzzer);     // Stop sound...
  delay(50);         // ...for 1/10 sec



//Reset the switch
  digitalWrite(ResetRelay, HIGH);
  delay(2000);
  digitalWrite(ResetRelay, LOW);
  delay(2000);
  digitalWrite(ResetRelay, HIGH);
  delay(2000);
}