15. System Integration¶

#include <WiFi.h>
#include <WebSocketsServer.h>
#include <ArduinoJson.h>
#include <SPI.h>
#include <MFRC522.h>
#include <LiquidCrystal_I2C.h>
#include <ESP32Servo.h>

// ========================== NETWORK CONFIGURATION ==========================
const char* SSID_WIFI = "YOUR_SSID";
const char* PASS_WIFI = "YOUR_PASSWORD";

// ========================== PIN CONFIGURATION ==========================
#define PIN_RFID_SDA    5
#define PIN_RFID_RST    4
#define PIN_SERVO       13
#define PIN_LED_GREEN   25
#define PIN_LED_RED     26
#define PIN_BUZZER      27

// ========================== GLOBAL OBJECTS ==========================
MFRC522 rfid(PIN_RFID_SDA, PIN_RFID_RST);
LiquidCrystal_I2C lcd(0x27, 20, 4);
Servo doorServo;
WebSocketsServer webSocket = WebSocketsServer(81);

// ========================== AUTHORIZED BADGE LIST ==========================
String authorizedUIDs[] = {
    "A1B2C3D4",
    "12345678"
};
int authorizedCount = 2;

// ========================== TIMING VARIABLES ==========================
unsigned long lastDoorOpen = 0;
bool doorIsOpen = false;
#define DOOR_OPEN_DURATION 5000  // Door stays open 5 seconds

// ========================== FUNCTIONS ==========================
String getUID(MFRC522 &reader) {
    String uid = "";
    for (byte i = 0; i < reader.uid.size; i++) {
        if (reader.uid.uidByte[i] < 0x10) uid += "0";
        uid += String(reader.uid.uidByte[i], HEX);
    }
    uid.toUpperCase();
    return uid;
}

bool isAuthorized(String uid) {
    for (int i = 0; i < authorizedCount; i++) {
        if (authorizedUIDs[i] == uid) return true;
    }
    return false;
}

void grantAccess(String uid) {
    // Visual and audio feedback
    digitalWrite(PIN_LED_GREEN, HIGH);
    digitalWrite(PIN_LED_RED, LOW);
    tone(PIN_BUZZER, 1000, 200);

    // Open the door lock
    doorServo.write(90);
    doorIsOpen = true;
    lastDoorOpen = millis();

    // Update LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("  ACCESS GRANTED  ");
    lcd.setCursor(0, 1);
    lcd.print("UID: " + uid);
    lcd.setCursor(0, 2);
    lcd.print("Door: OPEN");

    // Send log to dashboard
    sendLog(uid, "GRANTED");
}

void denyAccess(String uid) {
    // Visual and audio feedback
    digitalWrite(PIN_LED_GREEN, LOW);
    digitalWrite(PIN_LED_RED, HIGH);
    tone(PIN_BUZZER, 400, 1000);

    // LCD
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("  ACCESS DENIED   ");
    lcd.setCursor(0, 1);
    lcd.print("UID: " + uid);
    lcd.setCursor(0, 2);
    lcd.print("Door: LOCKED");

    // Send log to dashboard
    sendLog(uid, "DENIED");
    delay(2000);
    resetDisplay();
}

void sendLog(String uid, String result) {
    StaticJsonDocument<256> doc;
    doc["uid"]    = uid;
    doc["result"] = result;
    doc["time"]   = millis();
    char buffer[256];
    size_t len = serializeJson(doc, buffer);
    webSocket.broadcastTXT(buffer, len);
}

void checkDoorTimeout() {
    if (doorIsOpen && (millis() - lastDoorOpen >= DOOR_OPEN_DURATION)) {
        doorServo.write(0);
        doorIsOpen = false;
        digitalWrite(PIN_LED_GREEN, LOW);
        resetDisplay();
    }
}

void resetDisplay() {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("  FABLAB INPHB  ");
    lcd.setCursor(0, 1);
    lcd.print("Scan your badge...");
}

// ========================== SETUP ==========================
void setup() {
    Serial.begin(115200);

    // Pin setup
    pinMode(PIN_LED_GREEN, OUTPUT);
    pinMode(PIN_LED_RED,   OUTPUT);
    pinMode(PIN_BUZZER,    OUTPUT);

    // LCD init
    lcd.init();
    lcd.backlight();
    resetDisplay();

    // RFID init
    SPI.begin();
    rfid.PCD_Init();

    // Servo init
    doorServo.attach(PIN_SERVO);
    doorServo.write(0);  // Door locked by default

    // Wi-Fi
    WiFi.begin(SSID_WIFI, PASS_WIFI);
    lcd.setCursor(0, 3);
    lcd.print("Connecting WiFi...");
    while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
    }
    Serial.println("\n[WIFI] Connected! IP: " + WiFi.localIP().toString());
    lcd.setCursor(0, 3);
    lcd.print("IP: " + WiFi.localIP().toString());

    // WebSocket
    webSocket.begin();
    Serial.println("[WS] WebSocket started on port 81");
}

// ========================== LOOP ==========================
void loop() {
    webSocket.loop();
    checkDoorTimeout();

    // Check for new RFID badge
    if (!rfid.PICC_IsNewCardPresent() || !rfid.PICC_ReadCardSerial()) return;

    String uid = getUID(rfid);
    Serial.println("[RFID] Badge detected: " + uid);

    if (isAuthorized(uid)) {
        grantAccess(uid);
    } else {
        denyAccess(uid);
    }

    rfid.PICC_HaltA();
    rfid.PCD_StopCrypto1();
}