Password Based Door Lock System Using Arduino and Keypad

Overview

In this video, we will learn how to make a simple password based door lock system using Arduino, servo motor and 3*4 matrix keypad.

You can watch the following video below:-

Components Required

The required components list for this project given below:-

• Arduino Uno
• 4*3 Keypad
• 16*2 LCD Display
• 10K Potentiometer
• 220-ohm Resistor
• Servomotor 
• Vero Board
• Card Board
• Some Jumper Wire

Pinout

Circuit Schematic

The circuit diagram of the door lock system using Arduino and keypad has been given below:-

Fig: Door Lock System Using Arduino and Keypad

Circuit Description

Source Code

The source code is given below:-

 #include <Keypad.h>  
 #include <LiquidCrystal.h>  
 #include <Servo.h>  
   
 Servo myservo;  
   
 LiquidCrystal lcd(A0, A1, A2, A3, A4, A5);  
   
 #define Password_Lenght 7 // Give enough room for six chars + NULL char  
   
 int pos = 0;  // variable to store the servo position  
   
 char Data[Password_Lenght]; // 6 is the number of chars it can hold + the null char = 7  
 char Master[Password_Lenght] = "123456";  
 byte data_count = 0, master_count = 0;  
 bool Pass_is_good;  
 char customKey;  
   
 const byte ROWS = 4;  
 const byte COLS = 3;  
 char keys[ROWS][COLS] = {  
  {'1', '2', '3'},  
  {'4', '5', '6'},  
  {'7', '8', '9'},  
  {'*', '0', '#'}  
 };  
 bool door = true;  
   
 byte rowPins[ROWS] = {1, 2, 3, 4}; //connect to the row pinouts of the keypad  
 byte colPins[COLS] = {5, 6, 7}; //connect to the column pinouts of the keypad  
   
 Keypad customKeypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS); //initialize an instance of class NewKeypad  
   
 void setup()  
 {  
  myservo.attach(9);  
  ServoClose();  
  lcd.begin(16, 2);  
  lcd.print(" Arduino Door");  
  lcd.setCursor(0, 1);  
  lcd.print("--Look project--");  
  delay(3000);  
  lcd.clear();  
   
 }  
   
 void loop()  
 {  
  if (door == 0)  
  {  
   customKey = customKeypad.getKey();  
   
   if (customKey == '#')  
   
   {  
    lcd.clear();  
    ServoClose();  
    lcd.print(" Door is close");  
    delay(3000);  
    door = 1;  
   }  
  }  
   
  else Open();  
 }  
   
 void clearData()  
 {  
  while (data_count != 0)  
  { // This can be used for any array size,  
   Data[data_count--] = 0; //clear array for new data  
  }  
  return;  
 }  
   
 void ServoOpen()  
 {  
  for (pos = 180; pos >= 0; pos -= 5) { // 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 15ms for the servo to reach the position  
  }  
 }  
   
 void ServoClose()  
 {  
  for (pos = 0; pos <= 180; pos += 5) { // goes from 180 degrees to 0 degrees  
   myservo.write(pos);       // tell servo to go to position in variable 'pos'  
   delay(15);            // waits 15ms for the servo to reach the position  
  }  
 }  
   
 void Open()  
 {  
  lcd.setCursor(0, 0);  
  lcd.print(" Enter Password");  
    
  customKey = customKeypad.getKey();  
  if (customKey) // makes sure a key is actually pressed, equal to (customKey != NO_KEY)  
  {  
   Data[data_count] = customKey; // store char into data array  
   lcd.setCursor(data_count, 1); // move cursor to show each new char  
   lcd.print(Data[data_count]); // print char at said cursor  
   data_count++; // increment data array by 1 to store new char, also keep track of the number of chars entered  
  }  
   
  if (data_count == Password_Lenght - 1) // if the array index is equal to the number of expected chars, compare data to master  
  {  
   if (!strcmp(Data, Master)) // equal to (strcmp(Data, Master) == 0)  
   {  
    lcd.clear();  
    ServoOpen();  
    lcd.print(" Door is Open");  
    door = 0;  
   }  
   else  
   {  
    lcd.clear();  
    lcd.print(" Wrong Password");  
    delay(1000);  
    door = 1;  
   }  
   clearData();  
  }  
 }