新實驗1-2 ESP32 + RFID + MQTT Explorer + Google App Snooper

新實驗1-2 ESP32 + RFID + MQTT Explorer + Google App Snooper

#include <WiFi.h>

#include <PubSubClient.h>

#include <SPI.h>

#include <MFRC522.h>

// GPIO 2 D1

#define LED 2

/* Wiring RFID RC522 module

=============================================================================

GND     = GND   3.3V    = 3.3V

The following table shows the typical pin layout used:

 *             MFRC522      ESP32     Arduino       Arduino   Arduino    Arduino          Arduino

 *             Reader/PCD             Uno/101       Mega      Nano v3    Leonardo/Micro   Pro Micro

 * Signal      Pin          Pin       Pin           Pin       Pin        Pin              Pin

 * -----------------------------------------------------------------------------------------

 * RST/Reset   RST          GPIO27    9             5         D9         RESET/ICSP-5     RST

 * SPI SS      SDA(SS)      GPIO5     10            53        D10        10               10

 * SPI MOSI    MOSI         GPIO23    11 / ICSP-4   51        D11        ICSP-4           16

 * SPI MISO    MISO         GPIO19    12 / ICSP-1   50        D12        ICSP-1           14

 * SPI SCK     SCK          GPIO18    13 / ICSP-3   52        D13        ICSP-3           15

 *

[1] (1, 2) Configurable, typically defined as RST_PIN in sketch/program.

[2] (1, 2) Configurable, typically defined as SS_PIN in sketch/program.

[3] The SDA pin might be labeled SS on some/older MFRC522 boards

=============================================================================

*/

#define SS_PIN  5  // ESP32 pin GIOP5

#define RST_PIN 27 // ESP32 pin GIOP27

// WiFi

const char *ssid = "alex9ufo"; // Enter your Wi-Fi name

const char *password = "alex9981";  // Enter Wi-Fi password

// MQTT Broker

const char *mqtt_broker = "broker.mqtt-dashboard.com";

const char *topic1 = "alex9ufo/esp32/led";

const char *topic2 = "alex9ufo/esp32/RFID";

const char *mqtt_username = "alex9ufo";

const char *mqtt_password = "public";

const int mqtt_port = 1883;

bool ledState = false;

WiFiClient espClient;

PubSubClient client(espClient);

MFRC522 rfid(SS_PIN, RST_PIN); // Create MFRC522 instance

long lastMsg = 0;

char msg[50];

String json = "";    

char jsonChar1[100];  //client.publish("alex9ufo/Esp32/RFID"

//===========================================================

String printHex(byte *buffer, byte bufferSize) {

      String id = "";

      for (byte i = 0; i < bufferSize; i++) {

        id += buffer[i] < 0x10 ? "0" : "";

        id += String(buffer[i], HEX);

      }

      return id;

    }

//===========================================================

void setup() {

    // Set software serial baud to 115200;

    Serial.begin(115200);

    delay(1000); // Delay for stability

    //======================================================

    // Connecting to a WiFi network

    WiFi.begin(ssid, password);

    while (WiFi.status() != WL_CONNECTED) {

        delay(500);

        Serial.println("Connecting to WiFi...");

    }

    Serial.println("Connected to the WiFi network");

    // Setting LED pin as output

    pinMode(LED, OUTPUT);

    digitalWrite(LED, LOW);  // Turn off the LED initially

    //======================================================

    SPI.begin();           // Init SPI bus

    rfid.PCD_Init();    // Init MFRC522

    Serial.println(F("Ready!"));

    Serial.println(F("======================================================"));

    Serial.println("Tap an RFID/NFC tag on the RFID-RC522 reader");

    // Connecting to an MQTT broker

    client.setServer(mqtt_broker, mqtt_port);

    client.setCallback(callback);

    while (!client.connected()) {

        String client_id = "esp32-client-";

        client_id += String(WiFi.macAddress());

        Serial.printf("The client %s connects to the public MQTT broker\n", client_id.c_str());

        if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {

            Serial.println("Public HiveMQ MQTT broker (broker.mqtt-dashboard.com) connected");

        } else {

            Serial.print("Failed with state ");

            Serial.print(client.state());

            delay(2000);

        }

    }

    // Publish and subscribe

    client.subscribe(topic1);

}

//===========================================================

void callback(char *topic, byte *payload, unsigned int length) {

    Serial.print("Message arrived in topic: ");

    Serial.println(topic);

    Serial.print("Message: ");

    String message;

    for (int i = 0; i < length; i++) {

        message += (char) payload[i];  // Convert *byte to string

    }

    Serial.print(message);

    if (message == "on" && !ledState) {

        digitalWrite(LED, HIGH);  // Turn on the LED

        ledState = true;

    }

    if (message == "off" && ledState) {

        digitalWrite(LED, LOW); // Turn off the LED

        ledState = false;

    }

    Serial.println();

    Serial.println("-----------------------");

}

//===========================================================

void loop() {

    client.loop();

    delay(100); // Delay for a short period in each loop iteration

    long now = millis();

    if (now - lastMsg > 5000) {

      Serial.println("Reading RFIF card");

      lastMsg = now;

      if (rfid.PICC_IsNewCardPresent()) { // new tag is available

        if (rfid.PICC_ReadCardSerial()) { // NUID has been readed

          MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);

          Serial.print("RFID/NFC Tag Type: ");

          Serial.println(rfid.PICC_GetTypeName(piccType));

          // print UID in Serial Monitor in the hex format

          Serial.print("UID:");

          for (int i = 0; i < rfid.uid.size; i++) {

            Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");

            Serial.print(rfid.uid.uidByte[i], HEX);

          }

          Serial.println();

          String json = printHex(rfid.uid.uidByte, rfid.uid.size);

          // Convert JSON string to character array

          json.toCharArray(jsonChar1, json.length()+1);

   

          if  (client.connected()) {

            Serial.print("Publish message: ");

            Serial.println(json);

            // Publish JSON character array to MQTT topic

            client.publish(topic2,jsonChar1);

          }    

          rfid.PICC_HaltA(); // halt PICC

          rfid.PCD_StopCrypto1(); // stop encryption on PCD

        }

      }

       

  }

}

//===========================================================