ESP RFID Scanner

#include #include #include #include #include #include #define SS_PIN 21 #define RST_PIN 22 const char* ssid = "NICU"; const char* password = "12345678"; // Update this to your KSWEB host URL/path. // Example if project folder is htdocs/nicu-scaner: // http://192.168.4.2/nicu-scaner/api/ingest_scan.php String ingestUrl = "http://192.168.137.1/scaner/api/ingest_scan.php"; WebServer server(80); WebSocketsServer webSocket = WebSocketsServer(81); MFRC522 mfrc522(SS_PIN, RST_PIN); String webpage = R"rawliteral( ESP RFID Scanner

ESP32 RFID Scanner

Waiting for card...

No Card

)rawliteral"; unsigned long lastReadAt = 0; String lastUid = ""; String toUidString(MFRC522::Uid* uidData) { String uid = ""; for (byte i = 0; i < uidData->size; i++) { if (uidData->uidByte[i] < 0x10) uid += "0"; uid += String(uidData->uidByte[i], HEX); } uid.toUpperCase(); return uid; } bool shouldProcessUid(const String& uid) { unsigned long now = millis(); bool isDuplicate = (uid == lastUid) && ((now - lastReadAt) < 1200); if (isDuplicate) return false; lastUid = uid; lastReadAt = now; return true; } void postScanToServer(const String& uid) { if (WiFi.status() != WL_CONNECTED) return; HTTPClient http; http.begin(ingestUrl); http.addHeader("Content-Type", "application/json"); String body = "{\"uid\":\"" + uid + "\",\"device_name\":\"esp32-rfid\"}"; int code = http.POST(body); Serial.print("HTTP ingest status: "); Serial.println(code); if (code > 0) { String resp = http.getString(); Serial.println(resp); } http.end(); } void setup() { Serial.begin(115200); WiFi.mode(WIFI_STA); IPAddress localIp(192, 168, 137, 50); IPAddress gateway(192, 168, 137, 1); IPAddress subnet(255, 255, 255, 0); IPAddress dns(192, 168, 137, 1); if (!WiFi.config(localIp, gateway, subnet, dns)) { Serial.println("STA config failed"); } WiFi.begin(ssid, password); Serial.print("Connecting to WiFi"); while (WiFi.status() != WL_CONNECTED) { delay(300); Serial.print("."); } Serial.println(); Serial.print("STA IP: "); Serial.println(WiFi.localIP()); server.on("/", []() { server.send(200, "text/html", webpage); }); server.begin(); webSocket.begin(); SPI.begin(18, 19, 23, 21); mfrc522.PCD_Init(); } void loop() { server.handleClient(); webSocket.loop(); if (!mfrc522.PICC_IsNewCardPresent()) return; if (!mfrc522.PICC_ReadCardSerial()) return; String uid = toUidString(&mfrc522.uid); if (!shouldProcessUid(uid)) { mfrc522.PICC_HaltA(); mfrc522.PCD_StopCrypto1(); return; } int clients = webSocket.connectedClients(); if (clients > 0) { webSocket.broadcastTXT(uid); Serial.println("WS broadcast UID: " + uid); } else { Serial.println("No WS clients, sending HTTP fallback UID: " + uid); postScanToServer(uid); } mfrc522.PICC_HaltA(); mfrc522.PCD_StopCrypto1(); }