PASSWORD PROTECTED DOOR LOCK SECURITY SYSTEM

 LCD KEYPAD DOOR LOCK USING AN ARDUINO

 Hi ! how about locking your room using an LCD door lock. That would be nice, especially so if you want to lock out a pesky sibling. 😄

THIS IS WHAT YOU WOULD REQUIRE

  • An Arduino Uno Micro Controller 
  • 16 x 4 LCD display 
  • 12 V DC solenoid door lock 
  • Led Lights 
  • Some jumper wires for the connections   
  • 9 V battery (an external power supply more closer to 12 V  would be better )
  • Relay 
  • 10k potentiometer
  • 220 Ohm resistor
  • 4 x 4 keypad 
HOW DOES THIS DOOR LOCK WORK  🔐🔐🔐
  • When one enters the password for the door lock, the keys pressed match with the  default keys. 
  • The solenoid lock is activated and the door lock opens. 
  • Simultaneously, the LCD also displays a 'Welcome' message.  
  • If the keys do not match the default password then the door lock remains closed.
  • The LCD also displays 'Wrong Password'
CIRCUIT DIAGRAM



THE CODE 

After setting up the circuit as shown above, you need to plug in the Arduino to your PC 
and upload the code

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#include <Keypad.h>
#include <LiquidCrystal.h>
 
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] = {A0, A1, A2, A3}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {A4, A5, 2}; //connect to the column pinouts of the keypad
 
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
 
// 16x2 LCD 
#define rs 10 
#define en 9 
#define d4 6  
#define d5 5  
#define d6 4 
#define d7 3 
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
 
String password = "1234";
String mypassword;
 
int redled = 12;
int lock = 13;
 
int counter = 0; 
int attempts = 0; 
int max_attempts = 3; 
 
void setup(){
  Serial.begin(9600);
  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  
  pinMode(redled, OUTPUT);
  pinMode(lock, OUTPUT);
  
  digitalWrite(redled, LOW);
  digitalWrite(lock, LOW);
  
  Serial.println("enter password");
    lcd.print("Enter Password:");
}
  
void loop()
{
  
 keypadfunction();
 
}
 
void keypadfunction()
{
 char key = keypad.getKey();
  
  if (key){
    Serial.println(key);
    counter = counter + 1; 
    lcd.setCursor(counter, 1);
    lcd.print("*");
  }
  if (key == '1')
  {
 
    mypassword = mypassword + 1;   
  }
  
    if (key == '2')
  {
 
    mypassword = mypassword + 2;  
  }
  
  if (key == '3')
  {
 
    mypassword = mypassword + 3; 
  }
  
   if (key == '4')
  {
  
    mypassword = mypassword + 4;  
  }
  
  if (key == '5')
  {
  
    mypassword = mypassword + 5;
  }
  
   if (key == '6')
  {
   
    mypassword = mypassword + 6; 
  }
  
   if (key == '7')
  {
 
    mypassword = mypassword + 7; 
  }
 
   if (key == '8')
  {
 
    mypassword = mypassword + 8; 
  }
  
  if (key == '9')
  {
 
    mypassword = mypassword + 9;
  }
             
                 if (key == '0')
  {
 
    mypassword = mypassword + 0; 
  }
  
  
        if (key == '*')
  {
    Serial.println(mypassword); 
    
if ( password == mypassword )
{
lcd.clear(); 
lcd.println(" Welcome To ");
lcd.setCursor(0,1);
lcd.println(" Create STEM ");
digitalWrite(lock, HIGH);
delay(5000); 
digitalWrite(lock,LOW);
mypassword = ""; 
counter = 0; 
lcd.clear();
lcd.setCursor(0,0); 
lcd.println("Enter password");
}
else
{
Serial.println("wrong");
digitalWrite(lock, LOW);
attempts = attempts + 1; 
if (attempts >= max_attempts )
{
  lcd.clear();
  lcd.setCursor(0,0); 
  lcd.print("Locked Out");
  
digitalWrite(redled, HIGH);
delay(5000); 
digitalWrite(redled, LOW); 
attempts = 0; 
 
}
mypassword = ""; 
counter = 0; 
lcd.clear(); 
lcd.setCursor(0,0); 
lcd.print("Wrong Password");
delay(1000);
 
lcd.setCursor(0,1); 
lcd.print("max attempts 3");
delay(1000);
 
lcd.clear(); 
lcd.println("Enter password");
lcd.setCursor(0,1); 
}
    
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FOR A BETTER EXPLANATION ALSO TAKE A LOOK AT THIS VIDEO 








Arduino, Unity, Cinematography

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