/*Thanks. Remember to visit my Youtube channel
  I've used a i2c LCD screen module and 9g servo motor. 
*/

//LCD config
#include <Wire.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,20,4);

#include <Servo.h>
#include <Keypad.h>

//Variables
int mot_min = 90;   //min servo angle  (set yours)
int mot_max = 180; //Max servo angle   (set yours)
int character = 0;
int activated =0;
char Str[16] = {' ', ' ', ' ', ' ', ' ', ' ', '-', '*', '*', '*', ' ', ' ', ' ', ' ', ' ', ' '};  

//Pins
Servo myservo;
int buzzer = 11;    // pin for the buzzer beep
int external = 12;  // pin to inside open
int internal = 13;  // pin to inside close

//Keypad config
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
//define the cymbols on the buttons of the keypads
char hexaKeys[ROWS][COLS] = {
  {'1','4','7','*'},
  {'2','5','8','0'},
  {'3','6','9','#'},
  {'A','B','C','D'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS); 

void setup() {

//... 
  Serial.begin(115200);
  Serial.println("\nOops!\n");

  Str[11] = '\0';
//  Str[12] = '\0';  

  myservo.attach(10); //attach the servo to pin D10
  pinMode(buzzer,OUTPUT); 
  pinMode(external,INPUT_PULLUP);
  pinMode(internal,INPUT_PULLUP); 
  //Init the screen and print the first text
  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.print("    PASSWORD");
  lcd.setCursor(0,1);
  lcd.print("      -***     ");

// for (; ; );

  //put the servo in the close position first
  myservo.write(mot_min);  
  
}

# define WTF LOW

void loop(){
///////////////EMERGENCY OPEN/CLOSE/////////
  if (digitalRead(external) == WTF)
  {
     myservo.write(mot_max);
      lcd.clear();
      lcd.setCursor(2,0);
      lcd.print("INSIDE  OPEN");
      activated = 2;
      analogWrite(buzzer,240);
      delay(250);
      analogWrite(buzzer,200);
      delay(250);
      analogWrite(buzzer,180);
      delay(250);
      analogWrite(buzzer,250);
      delay(250);
      analogWrite(buzzer,LOW);
     
      
      lcd.clear();    
      lcd.setCursor(4,0);
      lcd.print("WELLCOME");
      
      lcd.setCursor(2,1);
      lcd.print("ELECTRONOOBS");
      

      lcd.clear();    
      lcd.setCursor(3,0);
      lcd.print("DOOR  OPEN");
      lcd.setCursor(2,1);
      lcd.print("ELECTRONOOBS");
      delay(500);
    
  }

  if (digitalRead(internal) == WTF)
  {
    myservo.write(mot_min);
    activated = 0;
    character=0;
    Str[6]= '-';
    Str[7]= '*'; 
    Str[8]= '*'; 
    Str[9]= '*';
    Str[10]= ' ';   
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("    PASSWORD");    
    lcd.setCursor(0,1);
    lcd.print(Str);
  }
    
///////////////KEYPAD OPEN/CLOSE////////////  
  char customKey = customKeypad.getKey(); //this function reads the presed key
  
  if (customKey){

    if (character ==0)
    {  
    Serial.println(customKey);
    Str[6]= customKey;   
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("    PASSWORD");    
    lcd.setCursor(0,1);
    lcd.print(Str);
   
    }

    if (character ==1)
    {  
    Serial.println(customKey);
    Str[7]= customKey;   
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("    PASSWORD");    
    lcd.setCursor(0,1);
    lcd.print(Str);
   
    }

    if (character ==2)
    {  
    Serial.println(customKey);
    Str[8]= customKey;   
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("    PASSWORD");    
    lcd.setCursor(0,1);
    lcd.print(Str);
   
    }

    if (character ==3)
    {  
    Serial.println(customKey);
    Str[9]= customKey;   
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print("    PASSWORD");    
    lcd.setCursor(0,1);
    lcd.print(Str);
   
    }

    if (character ==4)
    {  
    Serial.println(customKey);
    Str[10]= customKey;
    activated=1;
   
    }
    character=character+1;
  }

  if (activated == 1)
    {
/*Change your password below!!! 
Change each of Str[6], Str[7], Str[8], Str[9]*/

    if(Str[10]='A' && character==5 && Str[6]=='3' && Str[7]=='0' && Str[8]=='0' && Str[9]=='7' )
    {
      myservo.write(mot_max);
      lcd.clear();
      lcd.setCursor(4,0);
      lcd.print("ACCEPTED");
      activated = 2;
      analogWrite(buzzer,240);
      delay(250);
      analogWrite(buzzer,200);
      delay(250);
      analogWrite(buzzer,180);
      delay(250);
      analogWrite(buzzer,250);
      delay(250);
      analogWrite(buzzer,LOW);
      delay(1000);
      
      lcd.clear();    
      lcd.setCursor(4,0);
      lcd.print("WELLCOME");
      delay(500);
      lcd.setCursor(2,1);
      lcd.print("ELECTRONOOBS");
      delay(1000);

      lcd.clear();    
      lcd.setCursor(3,0);
      lcd.print("DOOR  OPEN");
      lcd.setCursor(2,1);
      lcd.print("ELECTRONOOBS");
      
    }
    else
    {
      lcd.clear();    
      lcd.setCursor(1,0);
      lcd.print("PASSWORD ERROR");
      lcd.setCursor(3,1);
      lcd.print("TRY  AGAIN");
      analogWrite(buzzer,150);
      delay(3000);
      analogWrite(buzzer,LOW);
      character=0;
      Str[6]= '-';
      Str[7]= '*'; 
      Str[8]= '*'; 
      Str[9]= '*';
      Str[10]= ' ';
      activated = 0;
      lcd.clear();    
      lcd.setCursor(4,0);
      lcd.print("PASSWORD");
      lcd.setCursor(0,1);
      lcd.print(Str);   
    }
  }
  if (activated == 2)
    {
    if(customKey == 'B' )
    {
      myservo.write(mot_min);
      activated = 0;
      character=0;
      Str[6]= '-';
      Str[7]= '*'; 
      Str[8]= '*'; 
      Str[9]= '*';
      Str[10]= ' ';   
      lcd.clear();
      lcd.setCursor(0,0);
      lcd.print("    PASSWORD");    
      lcd.setCursor(0,1);
      lcd.print(Str);
     
    }
  }  
}