#include <Keypad.h>

#include <EEPROM.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x27 for a 16 chars and 2 line display

#include <Servo.h>

Servo myservo;


#define LEDindicator A3             //Door Open/close LED indicator

#define BypassSwitch A2           //Push Button for emergency bypass


int pos = 0;    // variable to store the servo position


const byte numRows= 4;          //number of rows on the keypad

const byte numCols= 4;          //number of columns on the keypad


char keymap[numRows][numCols]= 

{

{'1', '2', '3', 'A'}, 

{'4', '5', '6', 'B'}, 

{'7', '8', '9', 'C'},

{'*', '0', '#', 'D'}

};


char keypressed;                 

char code[]= {'1','2','3','4'};  //The default password

char code_buff1[sizeof(code)];  //Where the new password is stored

char code_buff2[sizeof(code)];  //Where the new password is stored again


short a=0,i=0,s=0,j=0;          //Variables


byte rowPins[numRows] = {8,9,10,11}; //Rows 0 to 3 

byte colPins[numCols]= {2,3,4,5}; //Columns 0 to 3



Keypad myKeypad= Keypad(makeKeymap(keymap), rowPins, colPins, numRows, numCols);
int count_wrong = 0;
int speaker = 13;
void setup()

         {

          Serial.begin(9600);

          lcd.init();                      // initialize the lcd 

          // Print a message to the LCD.

          lcd.backlight();

          lcd.setCursor(0,0);

          lcd.print("ACCESS PROTECTED");     

          lcd.setCursor(0,1);

          lcd.print("ENTER *(PW)0    ");      

          myservo.attach(7);  // attaches the servo on pin 9 to the servo object

          pinMode(LEDindicator,OUTPUT);
          pinMode(speaker,OUTPUT);
          pinMode(BypassSwitch,INPUT);

          for(i=0 ; i<sizeof(code);i++){        // uncomment
          EEPROM.write(i, code[i]);             //  uncomment
//           Serial.println(code[i]);
            //  EEPROM.commit();     
            }      
          // EEPROM.commit();               

          for(i=0 ; i<sizeof(code);i++){        // uncomment

           EEPROM.get(i, code[i]);             //  uncomment
           Serial.println(code[i]);
             }                                 


         }



void loop()

{

  if (count_wrong>= 3){
      digitalWrite(speaker, HIGH);
  }
  else digitalWrite(speaker, LOW);
  keypressed = myKeypad.getKey();               //4x4 key to be pressed

    if(keypressed == '*'){                      // * to open the lock

            lcd.clear();

            lcd.setCursor(0,0);

            lcd.print("ENTER (PW)0    ");           

            GetCode();                          //Getting code 

                  if(a==sizeof(code)) {
                      OpenDoor(); 
                      count_wrong = 0;
                  }          //The size of the code array

                                    

                  else{

                  lcd.clear(); 

                  lcd.setCursor(0,0);              

                  lcd.print("WRONG PASSWORD  ");          

                  lcd.setCursor(0,1);

                  lcd.print("TRY AGAIN       ");
                  count_wrong += 1;
                  Serial.println(count_wrong);

                  }

            delay(2000);

            lcd.clear();

            lcd.setCursor(0,0);

            lcd.print("ACCESS PROTECTED");     

            lcd.setCursor(0,1);

            lcd.print("ENTER *(PW)0    "); 

        }


     if(keypressed == '#'){                  //To change the code it calls the Password Change function

      PWChange();

     // lcd.clear();

     // lcd.print("ENTER PASSWORD  ");                 

     }


     if(digitalRead(BypassSwitch)==HIGH){      //Opening door

       digitalWrite(LEDindicator,HIGH);

       lcd.setCursor(0,0);              

       lcd.print("BYPASS ACTIVATED");        

       lcd.setCursor(0,1);

       lcd.print("DOOR OPENING....");

       for (pos = 90; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees in steps of 1 degree

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15 ms for the servo to reach the position

  }

  delay(3000);

  for (pos = 180; pos >= 90; pos -= 1) { // goes from 180 degrees to 0 degrees

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15 ms for the servo to reach the position

  }

      // delay(3000);                        //Opens for 3s you can change

       digitalWrite(LEDindicator,LOW);

            lcd.clear();

            lcd.setCursor(0,0);

            lcd.print("ACCESS PROTECTED");     

            lcd.setCursor(0,1);

            lcd.print("ENTER *(PW)0    "); 

     

     }

         

}


void GetCode(){                  //Getting code sequence

       i=0;                      //All variables set to 0

       a=0;

       j=0; 

                                     

     while(keypressed != '0'){                                     //The user press 0 to confirm the code otherwise he can keep typing

           keypressed = myKeypad.getKey();                         

             if(keypressed != NO_KEY && keypressed != '0' ){       //If the char typed isn't 0 and neither "nothing"

            

              lcd.setCursor(j,1);                                  //This to write "*" on the LCD whenever a key is pressed it's position is controlled by j

              lcd.print("*");

              j++;

            if(keypressed == code[i]&& i<sizeof(code)){            //if the char typed is correct a and i increments to verify the next caracter

                 a++;                                              //Now I think maybe I should have use only a or i ... too lazy to test it -_-'

                 i++;

                 }

            else

                a--;                                               //if the character typed is wrong a decrements and cannot equal the size of code []

                 

            }

            }

            

    keypressed = NO_KEY;


}


void PWChange(){                      //Change code sequence

      lcd.clear();

      lcd.print("PASSWORD CHANGE ");

      delay(1000);

      lcd.clear();

      lcd.print("ENTER (old PW)0 ");

      GetCode();                      //verify the old code first so you can change it

      

            if(a==sizeof(code)){      //again verifying the a value

            lcd.clear();

            lcd.print("PASSWORD CHANGE ");

            PWChangeCode();            //Get the new code

            PWChangeconfirm();            //Get the new code again to confirm it

            s=0;

              for(i=0 ; i<sizeof(code) ; i++){     //Compare codes in array 1 and array 2 from two previous functions

              if(code_buff1[i]==code_buff2[i])

              s++;                                //again this how we verifiy, increment s whenever codes are matching

              }

                  if(s==sizeof(code)){            //Correct is always the size of the array

                  

                   for(i=0 ; i<sizeof(code) ; i++){

                  code[i]=code_buff2[i];         //the code array now receives the new code

                  EEPROM.put(i, code[i]);        //And stores it in the EEPROM

                  //Serial.print(EEPROM.get(i, code[i])); //password                

                  }

                  

                  

                  lcd.clear();

                  lcd.print("PASSWORD CHANGED");

                  delay(2000);

                  }

                  

                  else{                         //In case the new codes aren't matching

                  lcd.clear();

                  lcd.print("NEW PASSWORD ARE");

                  lcd.setCursor(0,1);

                  lcd.print("NOT MATCHING !! ");

                  delay(2000);

                  lcd.setCursor(0,0);              

                  lcd.print("WRONG PASSWORD  ");          

                  lcd.setCursor(0,1);

                  lcd.print("TRY AGAIN       ");

                  }

            

          }

          

            delay(2000);

            lcd.clear();

            lcd.setCursor(0,0);

            lcd.print("ACCESS PROTECTED");     

            lcd.setCursor(0,1);

            lcd.print("ENTER *(PW)0    "); 

}


void PWChangeCode(){                      

  i=0;

  j=0;

  lcd.clear();

  lcd.print("CHANGE TO NEW PW");   

  lcd.setCursor(0,1);

  lcd.print("ENTER (new PW)0 ");

  delay(2000);

  lcd.clear();

  lcd.setCursor(0,1);

  lcd.print("ENTER (new PW)0 ");    

             

         while(keypressed != '0'){            //0 to confirm and quits the loop

             keypressed = myKeypad.getKey();

               if(keypressed != NO_KEY && keypressed != '0' ){

                

                lcd.setCursor(j,0);

                lcd.print("*");               //On the new code you can show * as I did or change it to keypressed to show the keys

                code_buff1[i]=keypressed;     //Store caracters in the array

                i++;

                j++;                    

                }

                }

keypressed = NO_KEY;

}


void PWChangeconfirm(){                         //This is exactly like the ChangeCode function but this time the code is stored in another array

  i=0;

  j=0;

  

  lcd.clear();

  lcd.print("CONFIRM PASSWORD");

  lcd.setCursor(0,1);

  lcd.print("ENTER (new PW)0 ");

  delay(3000);

  lcd.clear();

  lcd.setCursor(0,1);

  lcd.print("ENTER (new PW)0 ");


         while(keypressed != '0'){

             keypressed = myKeypad.getKey();

               if(keypressed != NO_KEY && keypressed != '0' ){

                

                

                lcd.setCursor(j,0);

                lcd.print("*");

                code_buff2[i]=keypressed;

                i++;

                j++;    

                              

                }

                }

keypressed = NO_KEY;

}


void OpenDoor(){             //Door opening function open for 3s

  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("ACCESS GRANTED  ");       

  lcd.setCursor(0,1);

  lcd.print("DOOR OPENING....");       

  digitalWrite(LEDindicator,HIGH);

  for (pos = 90; pos <= 180; pos += 1) { // goes from 0 degrees to 180 degrees

    // in steps of 1 degree

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15 ms for the servo to reach the position

  }

  delay(3000);

  for (pos = 180; pos >= 90; pos -= 1) { // goes from 180 degrees to 0 degrees

    myservo.write(pos);              // tell servo to go to position in variable 'pos'

    delay(15);                       // waits 15 ms for the servo to reach the position

  }

  

  digitalWrite(LEDindicator,LOW);

}