3.3V = 3V
GND = G
RST = D1
SDA = D2
MOSI = D7
MISO = D6
SCK = D5

GND = G
VCC = 3V
IN = D0
===========================================================
#include <SPI.h>
#include <MFRC522.h>

#define SS_PIN    4  // ESP32 pin 
#define RST_PIN   5 // ESP32 pin  
#define RELAY_PIN 16 // ESP32 pin connects to relay

MFRC522 rfid(SS_PIN, RST_PIN);

byte authorizedUID1[4] = {0x73, 0x1B, 0xE6, 0x11};
byte authorizedUID2[4] = {0x83, 0xF6, 0x11, 0x0C};   

int kondisi;

void setup() 

{
  Serial.begin(9600);
  SPI.begin(); // init SPI bus
  rfid.PCD_Init(); // init MFRC522
  pinMode(RELAY_PIN, OUTPUT);   // initialize pin as an output.
  digitalWrite(RELAY_PIN, HIGH); // deactivate the relay
  Serial.println("Tap an RFID/NFC tag on the RFID-RC522 reader");
  int kondisi = 0;
}

void loop() 

{
  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);

      if (rfid.uid.uidByte[0] == authorizedUID1[0] &&
          rfid.uid.uidByte[1] == authorizedUID1[1] &&
          rfid.uid.uidByte[2] == authorizedUID1[2] &&
          rfid.uid.uidByte[3] == authorizedUID1[3] &&
           kondisi == 0 ) 
          {
        Serial.println("ON ID 1");
        digitalWrite(RELAY_PIN, LOW); // activate the relay for 2 seconds
        kondisi = 1;
      }
      else
      if (rfid.uid.uidByte[0] == authorizedUID2[0] &&
          rfid.uid.uidByte[1] == authorizedUID2[1] &&
          rfid.uid.uidByte[2] == authorizedUID2[2] &&
          rfid.uid.uidByte[3] == authorizedUID2[3] &&
           kondisi == 0 )
          
          {
        Serial.println("ON ID 2");
        digitalWrite(RELAY_PIN, LOW); // activate the relay for 2 seconds
       kondisi = 1;
      }

else
      if (rfid.uid.uidByte[0] == authorizedUID1[0] &&
          rfid.uid.uidByte[1] == authorizedUID1[1] &&
          rfid.uid.uidByte[2] == authorizedUID1[2] &&
          rfid.uid.uidByte[3] == authorizedUID1[3] &&
           kondisi == 1 )
          
          {
        Serial.println("OF ID 1");
        digitalWrite(RELAY_PIN, HIGH); // activate the relay for 2 seconds
       kondisi = 0;
      }

else
      if (rfid.uid.uidByte[0] == authorizedUID2[0] &&
          rfid.uid.uidByte[1] == authorizedUID2[1] &&
          rfid.uid.uidByte[2] == authorizedUID2[2] &&
          rfid.uid.uidByte[3] == authorizedUID2[3] &&
           kondisi == 1 )
          
          {
        Serial.println("OF ID 2");
        digitalWrite(RELAY_PIN, HIGH); // activate the relay for 2 seconds
       kondisi = 0;
      }      


      
      else
      {
        Serial.print("Unauthorized Tag with 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();
      }

      rfid.PICC_HaltA(); // halt PICC
      rfid.PCD_StopCrypto1(); // stop encryption on PCD
    }
  }
}