DIY 홈보안 시스템 Arduino Uno R4 Wi-Fi키패드 LCD 디스플레이

 

DIY 홈보안 시스템 Arduino Uno R4 Wi-Fi키패드 LCD 디스플레이

 

 

 

 

 

 

코드 - 아직 시험하지 않았음. 마지막 부분을 보면 완성하지 못한 것처럼 보이네.

 

 

#include <DIYables_Keypad.h>  // Include the DIYables_Keypad library for handling the 4x4 keypad
#include <Wire.h>            // Include the Wire library for I2C communication
#include <LiquidCrystal_I2C.h> // Include the LiquidCrystal_I2C library for controlling the LCD display

const int ROW_NUM = 4;    // Define the number of rows in the keypad (4 rows)
const int COLUMN_NUM = 4; // Define the number of columns in the keypad (4 columns)

char keys[ROW_NUM][COLUMN_NUM] = { // Create a 2D array to represent the keys on the keypad
  {'1','2','3', 'A'},  // First row
  {'4','5','6', 'B'},  // Second row
  {'7','8','9', 'C'},  // Third row
  {'*','0','#', 'D'}   // Fourth row
};

byte pin_rows[ROW_NUM] = {9, 8, 7, 6}; // Define the pins connected to the rows of the keypad
byte pin_column[COLUMN_NUM] = {5, 4, 3, 2}; // Define the pins connected to the columns of the keypad

DIYables_Keypad keypad = DIYables_Keypad( makeKeymap(keys), pin_rows, pin_column, ROW_NUM, COLUMN_NUM );
// Create an instance of the DIYables_Keypad object using the keymap, row pins, and column pins

const String password = "1234A"; // Define the correct password to unlock the system
String input_password;           // Declare a string to store the user input

const int ledPin = 10;  // Define the pin connected to the LED

// LCD address and dimensions
const int lcdAddress = 0x27; // Define the I2C address for the LCD (change if necessary)
const int lcdColumns = 16;   // Define the number of columns in the LCD (16 columns)
const int lcdRows = 2;       // Define the number of rows in the LCD (2 rows)

LiquidCrystal_I2C lcd(lcdAddress, lcdColumns, lcdRows); // Create an instance of the LCD object

bool ledState = false; // Boolean to track the state of the LED (false = off, true = on)

void setup(){
  Serial.begin(9600);               // Start serial communication at 9600 baud for debugging
  Serial.println("Keypad 4x4 password");  // Print a message to the serial monitor

  // Initialize LED pin
  pinMode(ledPin, OUTPUT);          // Set the LED pin as an output
  digitalWrite(ledPin, LOW);        // Start with the LED turned off

  // Initialize LCD
  lcd.init();                       // Initialize the LCD
  lcd.backlight();                  // Turn on the LCD backlight
  lcd.setCursor(0, 0);              // Set the cursor to the first column of the first row
  lcd.print("Enter Password:");     // Display the prompt on the LCD
  
  input_password.reserve(32);       // Reserve 32 characters for the input password to optimize memory usage
}

void loop(){
  char key = keypad.getKey();       // Get the key pressed on the keypad

  if (key){                         // If a key is pressed
    Serial.println(key);            // Print the pressed key to the serial monitor

    if(key == '*') {                // If the '*' key is pressed
      input_password = "";          // Clear the input password
      lcd.clear();                  // Clear the LCD screen
      lcd.setCursor(0, 0);          // Set the cursor to the first column of the first row
      lcd.print("Input cleared");   // Display "Input cleared" on the LCD
      delay(2000);                  // Wait for 2 seconds
      lcd.clear();                  // Clear the LCD screen
      lcd.setCursor(0, 0);          // Set the cursor to the first column of the first row
      lcd.print("Enter Password:"); // Display the prompt on the LCD
      lcd.setCursor(0, 1);          // Set the cursor to the first column of the second row
      lcd.print("                "); // Clear the second row of the LCD
      Serial.println("Input cleared"); // Print "Input cleared" to the serial monitor
    } else if(key == '#') {         // If the '#' key is pressed
      if(password == input_password) { // Check if the entered password matches the correct password
        if (ledState) {             // If the LED is currently on
          // Turn off the LED
          digitalWrite(ledPin, LOW); // Turn off the LED
          lcd.clear();              // Clear the LCD screen
          lcd.setCursor(0, 0);      // Set the cursor to the first column of the first row
          lcd.print("LED is OFF");  // Display "LED is OFF" on the LCD
          delay(2000);              // Wait for 2 seconds
          lcd.clear();              // Clear the LCD screen
          lcd.setCursor(0, 0);      // Set the cursor to the first column of the first row
          lcd.print("Enter Password:"); // Display the prompt on the LCD
          lcd.setCursor(0, 1);      // Set the cursor to the first column of the second row
          lcd.print("                "); // Clear the second row of the LCD
          ledState = false;         // Update the LED state to off
        } else {                    // If the LED is currently off
          // Turn on the LED
          digitalWrite(ledPin, HIGH); // Turn on the LED
          lcd.clear();              // Clear the LCD screen
          lcd.setCursor(0, 0);      // Set the cursor to the first column of the first row
          lcd.print("LED is ON");   // Display "LED is ON" on the LCD
          delay(2000);              // Wait for 2 seconds
          lcd.clear();              // Clear the LCD screen
          lcd.setCursor(0, 0);      // Set the cursor to the first column of the first row
          lcd.print("Enter Password:"); // Display the prompt on the LCD
          lcd.setCursor(0, 1);      // Set the cursor to the first column of the second row
          lcd.print("                "); // Clear the second row of the LCD
          ledState = true;          // Update the LED state to on
        }
        Serial.println(ledState ? "LED is ON" : "LED is OFF"); // Print the LED state to the serial monitor
      } else {                      // If the entered password is incorrect
        Serial.println("Password is incorrect, try again"); // Print an error message to the serial monitor
        lcd.clear();                // Clear the LCD screen
        lcd.setCursor(0, 0);        // Set the cursor to the first column of the first row
        lcd.print("Incorrect");     // Display "Incorrect" on the LCD
        delay(2000);                // Wait for 2 seconds
        lcd.clear();                // Clear the LCD screen
        lcd.setCursor(0, 0);        // Set the cursor to the first column of the first row
        lcd.print("Enter Password:"); // Display the prompt on the LCD
        lcd.setCursor(0, 1);        // Set the cursor to the first column of the second row
        lcd.print("                "); // Clear the second row of the LCD
      }

      input_password = "";          // Clear the input password after checking
      lcd.setCursor(0, 1);          // Set the cursor to the first column of the second row
      lcd.print("                "); // Clear the second row of the LCD
    } else if(key == 'B') {         // If the 'B' key is pressed (used as backspace)
      if (input_password.length() > 0) { // If there is at least one character in the input password
        input_password.remove(input_password.length() - 1); // Remove the last character
        Serial.println("Last character removed"); // Print a message to the serial monitor
        lcd.setCursor(0, 1);        // Set the cursor to the first column of the second row
        lcd.print("                "); // Clear the second row of the LCD
        lcd.setCursor(0, 1);        // Set the cursor to the first column of the second row
        lcd.print(getPasswordDisplay()); // Display the masked input password on the LCD
      }
    } else if(key == 'C') {         // If the 'C' key is pressed (used to clear input)
      input_password = "";          // Clear the entire input password
      lcd.clear();                  // Clear the LCD screen
      lcd.setCursor(0, 0);          // Set the cursor to the first column of the first row
      lcd.print("All characters removed"); // Display a message on the LCD
      delay(2000);                  // Wait for 2 seconds
      lcd.clear();                  // Clear the LCD screen
      lcd.setCursor(0, 0);          // Set the cursor to