Arduino Security panel

Materials-:

• Arduino board

• Keypad 4*4

• LCD display 16*2

• Potentiometer (10kΩ)

• 2 LED bulbs (any color)

• Jumper wires 

• Breadboard

Circuit diagram-:

Code-:

#include <LiquidCrystal.h> 

#include <Keypad.h> 

#define redLED 10 //define the LED pins

#define greenLED 11

char* password ="1234"; //create a password

int pozisyon = 0; //keypad position

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

const byte cols = 4;

char keyMap [rows] [cols] = { //define the cymbols on the buttons of the keypad

  {'1', '2', '3', 'A'},

  {'4', '5', '6', 'B'},

  {'7', '8', '9', 'C'},

  {'*', '0', '#', 'D'}

};

byte rowPins [rows] = {1, 2, 3, 4}; //pins of the keypad

byte colPins [cols] = {5, 6, 7, 8};

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

LiquidCrystal lcd (A0, A1, A2, A3, A4, A5); // pins of the LCD. (RS, E, D4, D5, D6, D7)

void setup(){

  lcd.begin(16, 2);

  pinMode(redLED, OUTPUT);  //set the LED as an output

  pinMode(greenLED, OUTPUT);

  setLocked (true); //state of the password

}

void loop(){

  char whichKey = myKeypad.getKey(); //define which key is pressed with getKey

  lcd.setCursor(0, 0);

  lcd.print("    Welcome");

  lcd.setCursor(0, 1);

  lcd.print(" Enter 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("  Invalid Key!");

    delay(1000);

    lcd.clear();

  }

  if(whichKey == password [pozisyon]){

    pozisyon ++;

  }

  if(pozisyon == 4){

    setLocked (false);

    lcd.clear();

    lcd.setCursor(0, 0);

    lcd.print("*** Verified ***");

    delay(3000);

    lcd.clear();

    lcd.setCursor(0, 0);

    lcd.print("  Sanuka Arduino");

    lcd.setCursor(0, 1);

    lcd.print("Tutorial Project");

    delay(7000);

    lcd.clear();

  }

  delay(100);

}

void setLocked(int locked){

  if(locked){

    digitalWrite(redLED, HIGH);

    digitalWrite(greenLED, LOW);

    }

    else{

      digitalWrite(redLED, LOW);

      digitalWrite(greenLED, HIGH);

    }

  }