/*

Credit for : Nathan Sobieck
||  Simple Password Entry Using Matrix Keypad
||  4/5/2012 Updates Nathan Sobieck: Nathan@Sobisource.com
||
*/

//* is to validate password
//# is to reset password attempt

/////////////////////////////////////////////////////////////////
#include <Wire.h>
#include <Servo.h>
#include <Password.h> 
#include <Keypad.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
Password password = Password( "1234" );

const byte ROWS = 4; // Four rows
const byte COLS = 3; //  columns
// Define the Keymap
char keys[ROWS][COLS] = {
  {'1', '2', '3'},
  {'4', '5', '6'},
  {'7', '8', '9'},
  {'*', '0', '#'}
};

byte rowPins[ROWS] = { 8, 7, 6, 5 }; 
byte colPins[COLS] = { 4, 3, 2 };

// Create the Keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

​

void setup() {
  pinMode(10, OUTPUT); //Pin IN1 on the relay module
  digitalWrite(10, HIGH); // Turn it HIGH
  Serial.begin(9600);
  lcd.begin(16, 2);
  lcd.clear();
  lcd.setCursor(0, 0);
  
  keypad.addEventListener(keypadEvent); 
}

​

void loop() {
  keypad.getKey();
 
}

//take care of some special events
void keypadEvent(KeypadEvent eKey) {
  switch (keypad.getState()) {
    case PRESSED:
      Serial.print("Pressed: ");
      Serial.println(eKey);
      // lcd.write("Pressed: ");
      lcd.write(eKey);
      switch (eKey) {
        case '*': checkPassword();password.reset(); break;
        case '#': password.reset(); break;
        default: password.append(eKey);

      }
  }
}

void checkPassword() {
  if (password.evaluate()) {
    Serial.println("Success");
    lcd.write("Success");
  
    digitalWrite(10, LOW); // Actuate the relay module
    delay(1000);
    digitalWrite(10,HIGH);
 
    delay(1000);
    lcd.clear();

  }

else {
    Serial.println("Wrong");
    lcd.write("Wrong");
  
    digitalWrite(10, HIGH); //Reset the relay module
 //   myservo.write(0);
    delay(1000);
    lcd.clear();
    
  }
}