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Password based door locking system

Introduction

To design a circuit which checks the password entered by the user and opens the door accordingly

Components

Before you start building your Arduino-based drone, make sure you have the following components:

Arduino UNO

4*4 keypad

Power supply

16 x 2 LCD Display

Servo motor

5K Ohm Resistor

Connecting wires

Circuit diagram

A 4 by 4 keypad which is connected to the board through the D0-D7 pins, A16*2 lcd display(A0,A1,A2,A3,A4,A5) and a servo motor attached to d9, when the password is entered through the keypad it checks whether it matches or not , if correct the servo rotates by 180

Code

#include

Servo myservo;

int os=0; // LCD Connections

LiquidCrystal lcd(A0,A1,A2,A3,A4,A5);

const byte row=4;

const byte col=3;

char key[row][col]={

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

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

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

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

};

byte rowPins[row]={1,2,3,4};

byte colPins[col]={5,6,7};

Keypad keypad= Keypad(makeKeymap(key),rowPins,colPins,row,col);

char* password="4567";

int cp=0;

int redled=10;

int greenled=11;

int buzz=8;

int invalidcount=12;

void setup()

{

displayscreen();

Serial.begin(9600);

pinMode(redled, OUTPUT);

pinMode(greenled, OUTPUT);

pinMode(buzz, OUTPUT);

myservo.attach(9); //SERVO ATTACHED//

lcd.begin(16,2);

}

void loop()

{

if( cp==0)

{

displayscreen();

}

int l ;

char code=keypad.getKey();

if(code!=NO_KEY)

{

lcd.clear();

lcd.setCursor(0,0);

lcd.print("PASSWORD:");

lcd.print(" ");

lcd.setCursor(7,1);

for(l=0;l<=cp;++l)

{

lcd.print("*");

keypress();

}

if (code==password[cp])

{

++cp;

if(cp==4)

{

unlockdoor();

cp=0;

}

else

{

++invalidcount;

incorrect();

cp=0;

}

if(invalidcount==5)

{

++invalidcount;

torture1();

}

if(invalidcount==8)

{

torture2();

}

// LOOP ENDS!!!//

}

//********OPEN THE DOOR FUNCTION!!!!***********//

void unlockdoor()

{

delay(900);

lcd.setCursor(0,0);

lcd.println(" ");

lcd.setCursor(1,0);

lcd.print("Access Granted");

lcd.setCursor(4,1);

lcd.println("WELCOME!!");

lcd.setCursor(15,1);

lcd.println(" ");

lcd.setCursor(16,1);

lcd.println(" ");

lcd.setCursor(14,1);

lcd.println(" ");

lcd.setCursor(13,1);

lcd.println(" ");

unlockbuzz();

for(os = 180; os>=0; os-=5) // goes from 180 degrees to 0 degrees

{

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

delay(5); // waits 15ms for the servo to reach the position

}

delay(2000);

delay(1000);

counterbeep();

delay(1000);

for(os = 0; os <= 180; os +=5) // goes from 0 degrees to 180 degrees

{ // in steps of 1 degree

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

delay(15);

cp=0;

lcd.clear();

displayscreen();

}

//************WRONG CODE FUNCTION********//

void incorrect()

{

delay(500);

lcd.clear();

lcd.setCursor(1,0);

lcd.print("CODE");

lcd.setCursor(6,0);

lcd.print("INCORRECT");

lcd.setCursor(15,1);

lcd.println(" ");

lcd.setCursor(4,1);

lcd.println("GET AWAY!!!");

lcd.setCursor(13,1);

lcd.println(" ");

Serial.println("CODE INCORRECT YOU ARE UNAUTHORIZED");

digitalWrite(redled, HIGH);

digitalWrite(buzz, HIGH);

delay(3000);

lcd.clear();

digitalWrite(redled, LOW);

digitalWrite(buzz,LOW);

displayscreen();

}

//************** CLEAR THE SCREEN!!!*************//

void clearscreen()

{

lcd.setCursor(0,0);

lcd.println(" ");

lcd.setCursor(0,1);

lcd.println(" ");

lcd.setCursor(0,2);

lcd.println(" ");

lcd.setCursor(0,3);

lcd.println(" ");

}

//**************KEYPRESS********************//

void keypress()

{

digitalWrite(buzz, HIGH);

delay(50);

digitalWrite(buzz, LOW);

}

//********DISPALAY FUNCTION!!!*************//

void displayscreen()

{

lcd.setCursor(0,0);

lcd.println("*ENTER THE CODE*");

lcd.setCursor(1 ,1);

lcd.println("TO _/_ (OPEN)!!");

}

//*************** ARM SERVO***********//

void armservo()

{

for (os=180;os<=180;os+=50)

{

myservo.write(os);

delay(5);

}

delay(5000);

for(os=180;os>=0;os-=50)

{

myservo.write(os);

}

//**********UNLOCK BUZZ*************//

void unlockbuzz()

{

digitalWrite(buzz, HIGH);

delay(80);

digitalWrite(buzz, LOW);

delay(80);

digitalWrite(buzz, HIGH);

delay(80);

digitalWrite(buzz, LOW);

delay(200);

digitalWrite(buzz, HIGH);

delay(80);

digitalWrite(buzz, LOW);

delay(80);

digitalWrite(buzz, HIGH);

delay(80);

digitalWrite(buzz, LOW);

delay(80);

}

//**********COUNTER BEEP**********//

void counterbeep()

{

delay(1200);

lcd.clear();

digitalWrite(buzz, HIGH);

lcd.setCursor(2,15);

lcd.println(" ");

lcd.setCursor(2,14);

lcd.println(" ");

lcd.setCursor(2,0);

delay(200);

lcd.println("GET IN WITHIN:::");

lcd.setCursor(4,1);

lcd.print("5");

delay(200);

lcd.clear();

lcd.setCursor(2,0);