Freude an der Technik

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SDA
SCK
MOSI
MISO
IRQ
GND
RST
3V3

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RC522(RC533) Funktion     ESP32-Pin   Beschriftung

VCC          3.3 V        3.3V        3.3V
GND          Masse        GND         GND
SDA          SPI CS(SDA)  5           5/SPI CSn
SCK          SPI Clock    18          18/SPI SCK
MOSI         SPI TX       23          23/SPI TX
MISO         SPI RX       19          19/SPI RX
RST          Reset        26          26/RST

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

#define SS_PIN   5
#define RST_PIN  26

MFRC522 mfrc522(SS_PIN, RST_PIN);

void setup() {
  Serial.begin(115200);
  delay(1000);

  Serial.println("Start setup");

  SPI.begin(18, 19, 23, SS_PIN);

  pinMode(SS_PIN, OUTPUT);
  digitalWrite(SS_PIN, HIGH);

  mfrc522.PCD_Init();

  Serial.print("VersionReg: 0x");
  Serial.println(mfrc522.PCD_ReadRegister(MFRC522::VersionReg), HEX);

  mfrc522.PCD_AntennaOn();
  mfrc522.PCD_SetAntennaGain(MFRC522::RxGain_avg);

  Serial.println("Warte auf Karte...");
}

void loop() {
  if (!mfrc522.PICC_IsNewCardPresent()) return;
  if (!mfrc522.PICC_ReadCardSerial()) return;

  Serial.print("UID: ");
  for (byte i = 0; i < mfrc522.uid.size; i++) {
    if (mfrc522.uid.uidByte[i] < 0x10) Serial.print("0");
    Serial.print(mfrc522.uid.uidByte[i], HEX);
    Serial.print(" ");
  }
  Serial.println();

  delay(1500);
}