#include <Wire.h>

#include <LiquidCrystal_I2C.h>

#include <Keypad.h>

#define Password_Length 5

int signalPin = 12;

char Data[Password_Length];

char Master[Password_Length] = "1234";

byte data_count = 0, master_count = 0;

bool Pass_is_good;

char customKey;

const byte ROWS = 4;

const byte COLS = 4;

char hexaKeys[ROWS][COLS] = {

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

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

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

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

};

byte rowPins[ROWS] = {9, 8, 7, 6};

byte colPins[COLS] = {5, 4, 3};

Keypad customKeypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLS);

LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup(){

lcd.init();

lcd.backlight();

pinMode(signalPin, OUTPUT);

}

void loop(){

lcd.setCursor(0,0);

lcd.print("Enter Password:");

customKey = customKeypad.getKey();

if (customKey){

Data[data_count] = customKey;

lcd.setCursor(data_count,1);

lcd.print(Data[data_count]);

data_count++;

}

if(data_count == Password_Length-1){

lcd.clear();

if(!strcmp(Data, Master)){

lcd.print("Correct");

digitalWrite(signalPin, HIGH);

delay(5000);

digitalWrite(signalPin, LOW);

}

else{

lcd.print("Incorrect");

delay(1000);

}

lcd.clear();

clearData();

}

}

void clearData(){

while(data_count !=0){

Data[data_count--] = 0;

}

return;

}