實驗 ESP32 + RFID (Create Mode 建立資料模式/ Query Mode查詢資料模式)





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#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 *topic = "alex9ufo/esp32/Starting";
const char *mqtt_username = "alex9ufo";
const char *mqtt_password = "public";
const int mqtt_port = 1883;
bool ledState = false;
bool atwork = false;
WiFiClient espClient;
PubSubClient client(espClient);
MFRC522 rfid(SS_PIN, RST_PIN); // Create MFRC522 instance
long lastMsg = 0;
long lastMsg1= 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);
client.publish(topic,"ESP32 at work");
}
//===========================================================
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();
long now1 = millis();
if (now1 - lastMsg1 > 80000) {
lastMsg1 = now1;
if (atwork) {
client.publish(topic,"ESP32 at work");
atwork=false;
} else {
client.publish(topic," ");
atwork=true;
}
}
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
}
}
}
}
//===========================================================