https://www.instagram.com/p/DKZQHQBi4Eq/
#include <WiFi.h>
#include <HTTPClient.h>
#include <SPI.h>
#include <MFRC522.h>
// === Wi-Fi credentials ===
const char* ssid = "SSID";
const char* password = "password";
// === Home Assistant Webhook endpoint ===
const char* webhook_url = "http://HA_IP_ADDRESS:8123/api/webhook/rfid_trigger";
// === SPI Pin Assignments for Xiao ===
#define RST_PIN 3
#define SS_PIN 7
MFRC522 mfrc522(SS_PIN, RST_PIN);
// === Setup ===
void setup() {
Serial.begin(115200);
while (!Serial);
Serial.println("Connecting to Wi-Fi...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("\nWi-Fi connected.");
Serial.println("Initializing RFID...");
SPI.begin(8, 9, 10); // SCK, MISO, MOSI
mfrc522.PCD_Init();
Serial.println("Ready to scan tags.");
}
// === Send UID to Home Assistant via Webhook ===
void sendWebhook(String uid) {
if (WiFi.status() != WL_CONNECTED) return;
HTTPClient http;
http.begin(webhook_url);
http.addHeader("Content-Type", "application/json");
String payload = "{\"uid\": \"" + uid + "\"}";
int code = http.POST(payload);
Serial.print("Sent UID: "); Serial.print(uid);
Serial.print(" | HTTP Response: "); Serial.println(code);
http.end();
}
// === Main loop ===
void loop() {
if (!mfrc522.PICC_IsNewCardPresent() || !mfrc522.PICC_ReadCardSerial()) return;
String uid = "";
for (byte i = 0; i < mfrc522.uid.size; i++) {
if (mfrc522.uid.uidByte[i] < 0x10) uid += "0";
uid += String(mfrc522.uid.uidByte[i], HEX);
}
uid.toUpperCase();
Serial.println("Scanned UID: " + uid);
sendWebhook(uid);
delay(2000); // debounce
mfrc522.PICC_HaltA();
}
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