PROJECTS

#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] = {3, 2, 1, 0}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {4, 5, 6, 7}; //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(led, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(m11, OUTPUT);
  pinMode(m12, OUTPUT);
  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)))
    {
      digitalWrite(led, HIGH);
      beep();
      lcd.clear();
      lcd.print("Passkey Accepted");
      delay(2000);
      lcd.setCursor(0,1);
      lcd.print("#.Change Passkey");
      delay(2000);
      lcd.clear();
      lcd.print("Enter Passkey:");
      lcd.setCursor(0,1);
      i=0;
      digitalWrite(led, LOW);
    }
   
    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)
  {
    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++;
      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);
}