rfid/esp32/app.ino

#include <SPI.h>
#include <WiFi.h>
#include <HTTPClient.h>
#include <Ethernet.h>

#include <MFRC522v2.h>
#include <MFRC522DriverSPI.h>
#include <MFRC522DriverPinSimple.h>

// =========================
// USER CONFIG
// =========================
const String POST_URL = "https://cije.harryesses.com";
const char* LOCATION_ID = "office_1";
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
// WiFi fallback
// const char* WIFI_SSID = "Hillel_Student";
// const char* WIFI_PASS = "Hillel1025";
const char* WIFI_SSID = "Esses House Wifi";
const char* WIFI_PASS = "9175768551";
// =========================
// RC522 (Software SPI)
// =========================
#define SS_PIN   21
#define RST_PIN  38   // safer than 15

#define SCK_PIN  18
#define MISO_PIN 16
#define MOSI_PIN 17

SPIClass softSPI(HSPI);

MFRC522DriverPinSimple ss_pin(SS_PIN);
MFRC522DriverSPI driver{ss_pin, softSPI};
MFRC522 mfrc522(driver);

// =========================
// Ethernet pins (W5500)
// =========================
#define ETH_MOSI 11
#define ETH_MISO 12
#define ETH_SCK  13
#define ETH_CS   14

bool ethernetOK = false;
bool wifiOK = false;
String action = "";
// =========================
// NETWORK STATUS
// =========================
void checkEthernet() {
    // ETH.begin(ETH_CS, ETH_MOSI, ETH_MISO, ETH_SCK);
    // delay(2000);

    if (!Ethernet.begin(mac) == 0) {
        ethernetOK = true;
        Serial.print("Ethernet IP: ");
        Serial.println(Ethernet.localIP());
    } else {
        ethernetOK = false;
        Serial.println("Ethernet failed");
    }
}

void connectWiFi() {
    WiFi.mode(WIFI_STA);
    WiFi.begin(WIFI_SSID, WIFI_PASS);

    Serial.print("Connecting WiFi");
    unsigned long start = millis();

    while (WiFi.status() != WL_CONNECTED && millis() - start < 10000) {
        delay(500);
        Serial.print(".");
    }

    if (WiFi.status() == WL_CONNECTED) {
        wifiOK = true;
        Serial.println();
        Serial.print("WiFi IP: ");
        Serial.println(WiFi.localIP());
    } else {
        wifiOK = false;
        Serial.println("\nWiFi failed");
    }
}

bool sendHTTP(String uid, String action) {

    if (!ethernetOK && !wifiOK) return false;
    if (action == "") {
        action = "other";
    }
    HTTPClient http;
    http.begin(POST_URL+"/scan");
    http.addHeader("Content-Type", "application/json");

    String payload =
        "{"
        "\"uid\":\"" + uid + "\","
        "\"location_id\":\"" + String(LOCATION_ID) + "\","
        "\"action\":\"" + action + "\""
        "}";

    int code = http.POST(payload);

    // Serial.print("HTTP Code: ");
    // Serial.println(code);

    http.end();

    return code > 0;
}
bool checkBathroom() {

    if (!ethernetOK && !wifiOK) return false;

    HTTPClient http;
    http.begin(POST_URL+"/lights/bathroom/" + String(LOCATION_ID));
    http.addHeader("Content-Type", "application/json");



    int code = http.GET();

    // Serial.print("HTTP Code: ");
    // Serial.println(code);

    http.end();

    return code == 202;
}

// =========================
// SETUP
// =========================
void setup() {

    Serial.begin(115200);
    delay(3000);

    Serial.println("\nBooting RFID Scanner...");

    // RC522 SPI
    softSPI.begin(SCK_PIN, MISO_PIN, MOSI_PIN, SS_PIN);

    pinMode(RST_PIN, OUTPUT);
    digitalWrite(RST_PIN, HIGH);

    mfrc522.PCD_Init();
    Serial.println("RC522 ready");

    // NETWORK
    checkEthernet();

    if (!ethernetOK) {
        connectWiFi();
    }
    pinMode(1, INPUT_PULLUP);
    pinMode(2, INPUT_PULLUP);
    pinMode(3, INPUT_PULLUP);
    pinMode(48, OUTPUT);
}

// =========================
// LOOP
// =========================
void loop() {
    //   buttonState = digitalRead(1);/
  if (checkBathroom()){
    digitalWrite(48, LOW);
  }
  if (digitalRead(1) == LOW) { // Button is pressed
    action = "bathroom";
    delay(200); // Simple debounce
  }
  if (digitalRead(2) == LOW) { // Button is pressed
    action = "other";
    delay(200); // Simple debounce
  }
  if (digitalRead(3) == LOW) { // Button is pressed
    action = "office";
    delay(200); // Simple debounce
  }
    if (!mfrc522.PICC_IsNewCardPresent()) {
        delay(50);
        return;
    }

    if (!mfrc522.PICC_ReadCardSerial()) {
        delay(50);
        return;
    }

    // UID build
    String uidString = "";

    for (byte i = 0; i < mfrc522.uid.size; i++) {
        if (mfrc522.uid.uidByte[i] < 0x10) {
            uidString += "0";
        }
        uidString += String(mfrc522.uid.uidByte[i], HEX);
    }

    uidString.toUpperCase();

    Serial.print("Card UID: ");
    Serial.println(uidString);

    // send to server
    bool ok = sendHTTP(uidString, action);
    action = "";
    if (ok) {
        Serial.println("Sent OK");
    } else {
        Serial.println("Send FAILED");
    }

    mfrc522.PICC_HaltA();
    delay(2000);
}