rfid_multi chave liga_desliga

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

#define SS_PIN1 8
#define SS_PIN2 10
#define RST_PIN 9

MFRC522 mfrc522_1(SS_PIN1, RST_PIN); // Create MFRC522_1 instance.
MFRC522 mfrc522_2(SS_PIN2, RST_PIN); // Create MFRC522_2 instance.
int ledpin7 = 7;
int ledpin5 = 5;
char st[20];
byte State = 0;

void setup()
{
  Serial.begin(9600);
  SPI.begin(); // Inicia SPI bus
  mfrc522_1.PCD_Init(); // Inicia MFRC522_1
  mfrc522_2.PCD_Init(); // Inicia MFRC522_2
  pinMode (ledpin7 , OUTPUT);
  pinMode (ledpin5 , OUTPUT);
}

void loop()
{
  if( digitalRead(ledpin7) == HIGH )
  {   Serial.println("y");
      delay(2000);
  }

  if( digitalRead(ledpin5) == HIGH )
  {   Serial.println("k");
      delay(2000);
  }


  // Select one of the cards
  if ( ! mfrc522_1.PICC_ReadCardSerial())
  if ( ! mfrc522_2.PICC_ReadCardSerial())

  // Look for new cards
   if ( ! mfrc522_1.PICC_ReadCardSerial())
   {digitalWrite (ledpin7 , HIGH);
   }
   if ( ! mfrc522_2.PICC_ReadCardSerial())
  {
    // acende os leds
    digitalWrite (ledpin5 , HIGH);
    return ;
  }

  //Serial.print("UID da tag :");
  String conteudo_1= "";
  String conteudo_2= "";
  byte letra;

  for (byte i = 0; i < mfrc522_1.uid.size; i++)
  {
    //Serial.print(mfrc522_1.uid.uidByte[i] < 0x10 ? " 0" : " ");
    //Serial.print(mfrc522_1.uid.uidByte[i], HEX);
    conteudo_1.concat(String(mfrc522_1.uid.uidByte[i] < 0x10 ? " 0" : " "));
    conteudo_1.concat(String(mfrc522_1.uid.uidByte[i], HEX));
  }

  for (byte i = 0; i < mfrc522_2.uid.size; i++)
  {
    //Serial.print(mfrc522_2.uid.uidByte[i] < 0x10 ? " 0" : " ");
    //Serial.print(mfrc522_2.uid.uidByte[i], HEX);
    conteudo_2.concat(String(mfrc522_2.uid.uidByte[i] < 0x10 ? " 0" : " "));
    conteudo_2.concat(String(mfrc522_2.uid.uidByte[i], HEX));
  }

  conteudo_1.toUpperCase();
  conteudo_2.toUpperCase();
  if (conteudo_1.substring(1) == "E3 F5 31 DB") //UID Y - Chaveiro
  {
    digitalWrite (ledpin7 , LOW);
    //Serial.println("standby");
  }
    delay(200);

     if (conteudo_2.substring(1) == "53 0A 6D D9") //UID K - Chaveiro
  {
    digitalWrite (ledpin5 , LOW);
    //Serial.println("standby");
  }
    delay(200);
}