ESP8266 NodeMCU RFID : ติดต่อ RFID ด้วย NodeMCU

1. ต่อขาตามนี้
2. ตัวอย่างโคด ESP8266 RFID Arduino ดาวน์โหลดไลบารีที่นี่ http://www.arduinoall.net/arduino-tutor/code/MFRC522.rar

   /*
   SDA/SS d4
   SCK d5
   MOSI d7
   MISO d6
   RST RST
   GND GND
   3.3V 3.3V
   */
   #include 
   #include 
   
   #define SS_PIN D4
   #define RST_PIN D8
   
   MFRC522 rfid(SS_PIN, RST_PIN); // Instance of the class
   
   MFRC522::MIFARE_Key key;
   
   // Init array that will store new NUID
   byte nuidPICC[4];
   
   void setup() {
   Serial.begin(115200);
   SPI.begin(); // Init SPI bus
   rfid.PCD_Init(); // Init MFRC522
   
   for (byte i = 0; i < 6; i++) {
   key.keyByte[i] = 0xFF;
   }
   
   Serial.println(F("This code scan the MIFARE Classsic NUID."));
   Serial.print(F("Using the following key:"));
   printHex(key.keyByte, MFRC522::MF_KEY_SIZE);
   }
   
   void loop() {
   
   // Look for new cards
   if ( ! rfid.PICC_IsNewCardPresent())
   return;
   
   // Verify if the NUID has been readed
   if ( ! rfid.PICC_ReadCardSerial())
   return;
   
   Serial.print(F("PICC type: "));
   MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
   Serial.println(rfid.PICC_GetTypeName(piccType));
   
   // Check is the PICC of Classic MIFARE type
   if (piccType != MFRC522::PICC_TYPE_MIFARE_MINI &&
   piccType != MFRC522::PICC_TYPE_MIFARE_1K &&
   piccType != MFRC522::PICC_TYPE_MIFARE_4K) {
   Serial.println(F("Your tag is not of type MIFARE Classic."));
   return;
   }
   
   if (rfid.uid.uidByte[0] != nuidPICC[0] ||
   rfid.uid.uidByte[1] != nuidPICC[1] ||
   rfid.uid.uidByte[2] != nuidPICC[2] ||
   rfid.uid.uidByte[3] != nuidPICC[3] ) {
   Serial.println(F("A new card has been detected."));
   
   // Store NUID into nuidPICC array
   for (byte i = 0; i < 4; i++) {
   nuidPICC[i] = rfid.uid.uidByte[i];
   }
   
   Serial.println(F("The NUID tag is:"));
   Serial.print(F("In hex: "));
   printHex(rfid.uid.uidByte, rfid.uid.size);
   Serial.println();
   Serial.print(F("In dec: "));
   printDec(rfid.uid.uidByte, rfid.uid.size);
   Serial.println();
   }
   else Serial.println(F("Card read previously."));
   
   // Halt PICC
   rfid.PICC_HaltA();
   
   // Stop encryption on PCD
   rfid.PCD_StopCrypto1();
   }
   
   
   /**
   Helper routine to dump a byte array as hex values to Serial.
   */
   void printHex(byte *buffer, byte bufferSize) {
   for (byte i = 0; i < bufferSize; i++) {
   Serial.print(buffer[i] < 0x10 ? " 0" : " ");
   Serial.print(buffer[i], HEX);
   }
   }
   
   /**
   Helper routine to dump a byte array as dec values to Serial.
   */
   void printDec(byte *buffer, byte bufferSize) {
   for (byte i = 0; i < bufferSize; i++) {
   Serial.print(buffer[i] < 0x10 ? " 0" : " ");
   Serial.print(buffer[i], DEC);
   }
   }

    

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