Project 17674

#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Keypad.h>

// ── LCD ──────────────────────────────────────────────────────────────────────
LiquidCrystal_I2C lcd(0x27, 16, 2);   // change 0x27 to 0x3F if display is blank

// ── Keypad ───────────────────────────────────────────────────────────────────
const byte ROWS = 4, COLS = 4;
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};
byte rowPins[ROWS] = {A0, 8, 7, 6};
byte colPins[COLS] = {5, 4, 3, 2};
Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);

// ── LED Pins ─────────────────────────────────────────────────────────────────
const byte LED_PINS[5] = {10, 11, 12, 13, 9};

// ── Room Codes ───────────────────────────────────────────────────────────────
const char* ROOM_CODES[5] = {"0050", "0053", "0084", "0085", "0086"};
const byte  ROOM_COUNT     = 5;

// ── State ────────────────────────────────────────────────────────────────────
bool   ledState[5]  = {false, false, false, false, false};
String inputBuffer  = "";

// ── Helpers ──────────────────────────────────────────────────────────────────
void promptUser() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Input room num:");
  lcd.setCursor(0, 1);
  lcd.print("                ");
  Serial.println("---------------------------");
  Serial.println("Prompt: Waiting for input...");
}

void showInput(const String& buf) {
  lcd.setCursor(0, 1);
  lcd.print("Code: ");
  lcd.print(buf);
  for (byte i = buf.length(); i < 10; i++) lcd.print(' ');

  Serial.print("Key pressed | Buffer: [");
  Serial.print(buf);
  Serial.println("]");
}

void showFeedback(byte roomIndex, bool turnedOn) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Room ");
  lcd.print(roomIndex + 1);
  lcd.print(turnedOn ? ": ON " : ": OFF");
  lcd.setCursor(0, 1);
  lcd.print("LED toggled!");

  Serial.print("SUCCESS | Room ");
  Serial.print(roomIndex + 1);
  Serial.print(" LED -> ");
  Serial.println(turnedOn ? "ON" : "OFF");
  Serial.print("LED pin ");
  Serial.print(LED_PINS[roomIndex]);
  Serial.println(turnedOn ? " set HIGH" : " set LOW");

  delay(1500);
  promptUser();
}

void showInvalid() {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Invalid code!");

  Serial.print("INVALID | Code entered: [");
  Serial.print(inputBuffer);
  Serial.println("] — no match found");

  delay(1200);
  promptUser();
}

int matchCode(const String& code) {
  Serial.print("Matching code: [");
  Serial.print(code);
  Serial.println("]");
  for (byte i = 0; i < ROOM_COUNT; i++) {
    Serial.print("  Checking room ");
    Serial.print(i + 1);
    Serial.print(" code [");
    Serial.print(ROOM_CODES[i]);
    Serial.print("] -> ");
    if (code == ROOM_CODES[i]) {
      Serial.println("MATCH!");
      return i;
    }
    Serial.println("no match");
  }
  return -1;
}

// ── Setup ─────────────────────────────────────────────────────────────────────
void setup() {
  Serial.begin(9600);
  Serial.println("=== Room LED Controller ===");
  Serial.println("Initializing...");

  for (byte i = 0; i < ROOM_COUNT; i++) {
    pinMode(LED_PINS[i], OUTPUT);
    digitalWrite(LED_PINS[i], LOW);
    Serial.print("LED pin ");
    Serial.print(LED_PINS[i]);
    Serial.println(" initialized LOW");
  }

  lcd.init();
  lcd.backlight();
  Serial.println("LCD initialized");
  Serial.println("System ready!");
  Serial.println("---------------------------");

  promptUser();
}

// ── Loop ──────────────────────────────────────────────────────────────────────
void loop() {
  char key = keypad.getKey();
  if (!key) return;

  Serial.print("Key detected: [");
  Serial.print(key);
  Serial.println("]");

  // '*' clears/cancels
  if (key == '*') {
    Serial.println("CLEAR | Input buffer reset");
    inputBuffer = "";
    promptUser();
    return;
  }

  // '#' confirms entry
  if (key == '#') {
    Serial.print("CONFIRM | Submitting code: [");
    Serial.print(inputBuffer);
    Serial.println("]");

    if (inputBuffer.length() == 4) {
      int room = matchCode(inputBuffer);
      if (room != -1) {
        ledState[room] = !ledState[room];
        digitalWrite(LED_PINS[room], ledState[room] ? HIGH : LOW);
        showFeedback(room, ledState[room]);
      } else {
        showInvalid();
      }
    } else {
      Serial.print("INVALID | Code length is ");
      Serial.print(inputBuffer.length());
      Serial.println(", expected 4 digits");
      showInvalid();
    }
    inputBuffer = "";
    return;
  }

  // accept only digits 0-9, max 4 characters
  if (isDigit(key) && inputBuffer.length() < 4) {
    inputBuffer += key;
    showInput(inputBuffer);
  } else if (!isDigit(key)) {
    Serial.print("IGNORED | Non-digit key: [");
    Serial.print(key);
    Serial.println("]");
  } else if (inputBuffer.length() >= 4) {
    Serial.println("IGNORED | Buffer already full (4 digits max)");
  }
}