��HOW TO MAKE DOOR LOCK SYSTEM USING ARDUINO | ARDUINO TUTORIALS | INTERF...

HELLO EVERYONE, TODAY WE WILL LEARN HOW TO MAKE A DOOR LOCK SYSTEM USING ARDUINO, KEYPAD, LCD, AND A SERVO MOTOR.

TO BEGIN WITH, LET'S HAVE A LIST OF COMPONENTS THAT WE REQUIRE FOR THIS PROJECT:

1. ARDUINO MEGA.

2. LCD MODULE.

3. KEYPAD MODULE.

4. BUZZER.

5. RGB LED.

6. BREADBOARD.

7. CONNECTING WIRES.

8. RESISTORS.

9. POTENTIOMETER.



ONCE, THE COMPONENTS ARE COLLECTED, WE NEED TO SETUP THE CIRCUIT, AS PER THE SCHEMATICS GIVEN IN THE VIDEO.

ALSO YOU CAN SETUP INDIVIDUAL COMPONENTS LIKE

1. LCD: https://youtu.be/Li-ZkPfosvE

2. KEYPAD: https://youtu.be/nex5usOycSM

3. RGB LED: https://youtu.be/NLr56HLcWWk

4. SERVO MOTORS



BY VISITING THE CORRESPONDING LINKS GIVEN ABOVE.



AFTER THE CIRCUIT IS COMPLETE, YOU NEED TO UPLOAD THE CODE:



#include<Keypad.h> // KEYPAD LIBRARY FOR KEYPAD INTERFACING

#include<LiquidCrystal.h> // LIBRARY FOR LCD INTERFACING

#include<Servo.h>// LIBRARY FOR SERVO MOTOR

//#include<String.h>

#define buzzer 10 // DEFINING PIN FOR BUZZER.



LiquidCrystal lcd(2,3,4,5,6,7); // PINS FOR LCD



char keys[4][4]={ // LAYOUT OF KEYPAD

 {'1','2','3','A'},

 {'4','5','6', 'B'},

 {'7','8','9', 'C'},

 {'*','0','#', 'D'}};



byte rowPin[4]={A0,A1,A2,A3}; // ROW PINS OF KEYPAD

byte colPin[4]={A4,A5,A6,A7}; // COLUMN PINS OF KEYPAD



Servo servo_Motor;

String password = "159";  // SETTING DEFAULT PASSWORD.

int position = 0; // VARIABLE FOR DETERMINING THE POSITION.



int wrong = 0; // VARIABLE FOR CALCULATING THE WRONG INPUT.



int redPin = 9; // DEFINING PIN FOR RED LED

int greenPin = 8; // DEFINING PIN FOR GREEN LED



Keypad keypad=Keypad(makeKeymap(keys),rowPin,colPin,4,4);

// MAPPING THE KEYPAD.





int total = 0; // VARIABLE TO DETERMINE THE NUMBER OF WRONG ATTEMPTS.



void setup()

{

 pinMode(redPin,OUTPUT);

 pinMode(greenPin,OUTPUT);



lcd.begin(16,2);

lcd.print("DOOR LOCK SYSTEM");

lcd.setCursor(0,2);

lcd.print("       BY:");

delay(2000);

lcd.clear();

lcd.print("Creative");

lcd.setCursor(0,2);

lcd.print("    Engineer");

delay(2000);

lcd.clear();

servo_Motor.attach(11);

setLocked(true);

delay(1000);



pinMode(buzzer, OUTPUT);

}



void loop()

{

 char pressed=keypad.getKey();// TAKING THE INPUT FROM KEYPAD

 String key[3];

 

 if(pressed) // IF THE KEY IS PRESSED

 {

  lcd.clear();

  lcd.print("Enter Password:");

  lcd.setCursor(position,2);

  lcd.print(pressed);

  delay(500);

 

    if(pressed == '*' || pressed == '#')

      {

          position = 0;

          setLocked(true);

          lcd.clear();

      }



    else if(pressed == password[position])

      {

          key[position]=pressed;

          position++;

      }



    else if (pressed != password[position] )

      {// IN CASE OF WRONG INPUT INCREMENT BOTH WRONG AND POSITION.

          wrong++;

          position ++;

      }



    if(position == 3)

      {// WHEN POSITION == 3 THEN CHECK THE FOLLOWING

          if( wrong >0) // IF ANY WRONG INPUT IF GIVEN THEN INCREMENT TOTAL AND

          // SET WRONG AND POSITION TO ZERO.

            {

                total++;

                wrong = 0;

                position = 0;

                lcd.clear();

                lcd.print("WRONG");

                lcd.setCursor(5,2);

                lcd.print("PASSWORD");

                delay(1000);

                setLocked(true);

            }



          else if(position == 3 && wrong == 0)

            {// IF NO WRONG VALUE IS GIVEN THEN DISPLAY THE ACCEPTED PASSWORD AND

              // MOVE THE SERVO MOTOR.

                position = 0;

                wrong = 0;

                lcd.clear();

                lcd.print("PASSWORD");

                lcd.setCursor(6,2);

                lcd.print("ACCEPTED");

                delay(2000);

                setLocked(false);

            }



          if(total ==3)// IF TOTAL OF 3 ATTEMPTS ARE DONE BY ENTERING WRONG PASS

          //WORD THEN SOUND A BUZZER AND SET TOTAL TO 0.

            {

                total=0;

                buzzer_beep();

                delay(500);

            }



        }



   }



   lcd.clear();

   lcd.setCursor(16,0);

   lcd.print("Subscribe Channel");

   lcd.setCursor(16,1);

   lcd.print("For More Videos");

   delay(2000);

   while(1)

   {

   lcd.scrollDisplayLeft();

   delay(200);

   }

}



void setLocked(int locked)// FUNCTION TO CHANGE STATUS OF SERVO MOTOR.

  {

    if (locked)

      {

          digitalWrite(redPin, HIGH);

          digitalWrite(greenPin, LOW);

          delay(1000);

          servo_Motor.attach(11);

          servo_Motor.write(10);

          delay(1000);

          servo_Motor.detach();

      }

    else

      {

          digitalWrite(redPin, LOW);

          digitalWrite(greenPin, HIGH);

          delay(1000);

          servo_Motor.attach(11);

          servo_Motor.write(90);

          delay(1000);

          servo_Motor.detach();

      }

  }

void buzzer_beep()// FUNCTION TO BEEP THE BUZZER.

{

   digitalWrite(buzzer,HIGH);

   delay(1000);

   digitalWrite(buzzer,LOW);

   delay(1000);

}



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//VIDEO SO THAT OTHERS CAN ALSO LEARN NEW THINGS.







ONTO THE ARDUINO IDE AND THEN UPLOAD IT ONTO THE ARDUINO MEGA BOARD.

ONCE THE CODE IS UPLOADED, YOUR PROJECT IS READY TO GO.



WORKING OF PROJECT:



THE PROJECT COMPARES A DEFAULT PASSWORD ALREADY DEFINED WITH THE PASSWORD THAT WE INPUT FROM THE KEYPAD. IF THE ENTERED PASSWORD IS CORRECT, THEN GREEN LED IS ON AND SERVO MOTOR TURNS TO OPEN POSITION, IF WRONG PASSWORD IS ENTERED, THE RED LED IS ON AND SERVO MOTOR IS REMAINED CLOSED. IF WRONG PASSWORD IS ENTERED 3 TIMES, THEN BLUE LED/BUZZER IS ON.





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