rfid wemos.ino

/*
 * RFID wemos
 * 
 * feb 2020
 * Yeffrimic,Xibalba Hackerspace.
 * 
 */

#include <SPI.h>
#include <MFRC522.h>

#define RST_PIN         D4        
#define SS_PIN          D8        

MFRC522 mfrc522(SS_PIN, RST_PIN);  

void setup() {
  Serial.begin(115200);   
  SPI.begin();      
  mfrc522.PCD_Init();   
  mfrc522.PCD_DumpVersionToSerial();  
  Serial.println(F("Scan PICC to see UID, SAK, type, and data blocks..."));
}

void loop() { 
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent()) {
    delay(50);
    return;
  }
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial()) {
    delay(50);
    return;
  }

  Serial.print(F("Card UID:"));
  dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
  Serial.println();
}


void dump_byte_array(byte *buffer, byte bufferSize) {
  for (byte i = 0; i < bufferSize; i++) {
    Serial.print(buffer[i] < 0x10 ? " 0" : " ");
    Serial.print(buffer[i], HEX);
  }
}