Password Based Doorlock System Using Arduino|| Mini Project

Electronics project.
Project Based On Aurdino.

Here's the code of the project

CODE:
#include <Keypad.h>
#include<LiquidCrystal.h>
#include<EEPROM.h>
#define buzzer 15
LiquidCrystal lcd(13,12,11,10,9,8);
char password[4];
char pass[4],pass1[4];
int i=0;
char customKey=0;
const byte ROWS = 4; //four rows
const byte COLS = 4; //four columns
char hexaKeys[ROWS][COLS] = {
{'1','2','3','A'},
{'4','5','6','B'},
{'7','8','9','C'},
{'*','0','#','D'}
};
byte rowPins[ROWS] = {7, 6, 5, 4}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {3, 2, 1, 0}; //connect to the column pinouts of the keypad
//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(hexaKeys), rowPins, colPins, ROWS,
COLS);
void setup()
{
lcd.begin(16,2);
pinMode(buzzer, OUTPUT);

14

lcd.print(" Electronic ");
lcd.setCursor(0,1);
lcd.print(" Keypad Lock ");
delay(2000);
lcd.clear();
lcd.print("Enter Ur Passkey:");
lcd.setCursor(0,1);
for(int j=0;j<4;j++)
EEPROM.write(j, j+49);
for(int j=0;j<4;j++)
pass[j]=EEPROM.read(j);
}

void loop()
{
customKey = customKeypad.getKey();
if(customKey=='#')
change();
if (customKey)
{
password[i++]=customKey;
lcd.print(customKey);
beep();
}
if(i==4)
{
delay(200);
for(int j=0;j<4;j++)
pass[j]=EEPROM.read(j);
if(!(strncmp(password, pass, 4)))
{
beep();
lcd.clear();
lcd.print("Passkey Accepted");

15

delay(2000);
lcd.setCursor(0,1);
lcd.print("#.Change Passkey");
delay(2000);
lcd.clear();
lcd.print("Enter Passkey:");
lcd.setCursor(0,1);
i=0;
}

else
{
digitalWrite(buzzer, HIGH);
lcd.clear();
lcd.print("Access Denied...");
lcd.setCursor(0,1);
lcd.print("#.Change Passkey");
delay(2000);
lcd.clear();
lcd.print("Enter Passkey:");
lcd.setCursor(0,1);
i=0;
digitalWrite(buzzer, LOW);
}
}
}
void change()
{
int j=0;
lcd.clear();
lcd.print("UR Current Passk");
lcd.setCursor(0,1);
while(j<4)
{

16

char key=customKeypad.getKey();
if(key)
{
pass1[j++]=key;
lcd.print(key);
beep();
}
key=0;
}
delay(500);
if((strncmp(pass1, pass, 4)))
{
lcd.clear();
lcd.print("Wrong Passkey...");
lcd.setCursor(0,1);
lcd.print("Better Luck Again");
delay(1000);
}
else
{
j=0;

lcd.clear();
lcd.print("Enter New Passk:");
lcd.setCursor(0,1);
while(j<4)
{
char key=customKeypad.getKey();
if(key)
{
pass[j]=key;
lcd.print(key);
EEPROM.write(j,key);
j++;

17

beep();
}
}
lcd.print(" Done......");
delay(1000);
}
lcd.clear();
lcd.print("Enter Ur Passk:");
lcd.setCursor(0,1);
customKey=0;
}
void beep()
{
digitalWrite(buzzer, HIGH);
delay(20);
digitalWrite(buzzer, LOW);
}