Arduino based security system

aterials:- 

  • Arduino uno 
  • LCD display
  • Keypad
  • LED bulb
  • 10k potentiometer
  • Breadboard


Connections:-

    Display pins
   Vss = Arduino GND
   VDD = Arduino 5V
   V0 = Potentiometer center pin
   RS = Analog pin  5
   RW = Arduino GND
   E = Analog pin 4
   D4 = Arduino Analog pin 0
   D5  = Arduino analog pin 1
   D6 = Arduino analog pin 2
   D7 = Arduino analog pin 3
   A = Arduino  5V/3.5V
   K = Arduino GND

   Keypad pins

   keypad left pin to right=Arduino digital pin 0 to 7

   LED pins

   LED (+) = Arduino digital pin 13
   LED (-) = Arduino GND

Libraries:-


Code:-

#include <LiquidCrystal.h> //include LCD library
#include <Keypad.h> //include keypad library

 //define the LED pins
#define LED 13

char* password ="1234"; //create a password
int pozisyon = 0;

const byte rows = 4; //number of the keypad's rows
const byte cols = 4;//number of the keypad's columns

char keyMap [rows] [cols] = {
  {'1', '2', '3', 'A'},
  {'4', '5', '6', 'B'},
  {'7', '8', '9', 'C'},
  {'*', '0', '#', 'D'}
};

byte rowPins [rows] = {0, 1, 2, 3}; //pins of the keypad
byte colPins [cols] = {4, 5, 6, 7};

Keypad myKeypad = Keypad( makeKeymap(keyMap), rowPins, colPins, rows, cols);

LiquidCrystal lcd (A5, A4, A0, A1, A2, A3); // pins of the LCD.

void setup(){

  lcd.begin(16, 2);
  pinMode(LED, OUTPUT);
  setLocked (true);
}
void loop(){

  char whichKey = myKeypad.getKey();

  lcd.setCursor(0, 0);
  lcd.print("Please Enter ");
  lcd.setCursor(0, 1);
    lcd.print("       Password");

  if(whichKey == '*' || whichKey == '#' || whichKey == 'A' ||       //define invalid keys
  whichKey == 'B' || whichKey == 'C' || whichKey == 'D'){

    pozisyon=0;
    setLocked (true);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(" ** Try again **");
    delay(1000);
    lcd.clear();
  }
  if(whichKey == password [pozisyon]){

    pozisyon ++;
  }
  if(pozisyon == 4){
    setLocked (false);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("*Welcome*");
    lcd.setCursor(0, 1);
    lcd.print("     Mr.Arduino");
    delay(5000);
    lcd.clear();
  }
  delay(100);
}

void setLocked(int locked){
  if(locked){digitalWrite(LED, LOW);
    }
    else{
      digitalWrite(LED, HIGH);
    }

  }