RFID check

Projects Programming
9

I need help

I make it works with the code below, but it's always checking id tags.. I want that the reader stay in stand-by if there is no card to scan, what i have to do?

#include "SoftwareSerial.h"

#define txPin 11
#define rxPin 10

SoftwareSerial RFID(rxPin, txPin);

int val=0;
byte data[5];
byte tag1[4] = {0x5E,0xE8,0xCB,0x61};
boolean tag1_card = true;

void setup(){
  
  pinMode(txPin, OUTPUT); 
  pinMode(rxPin, INPUT);
  pinMode(6,OUTPUT);
  
  Serial.begin(9600);
  RFID.begin(9600);
  
  Serial.println("");
 
  RFID.write(0xAB);
  RFID.write(0x02);
  RFID.write(0x02); 
 
  delay(100);   
  while(Serial.available()>0){
     RFID.read();
  }
  Serial.println();
  Serial.println("Waiting for Card...");
}



void loop() {
  val = RFID.read();
  Serial.println();
  while (val != 0xAB){  
    val = RFID.read();
    delay(10);
      
  }
   
  RFID.read();
  RFID.read();
  data[0] = RFID.read();    
  data[1] = RFID.read();   
  data[2] = RFID.read();    
  data[3] = RFID.read();    

  for (int i=0; i<4; i++){
    if (data[i] < 16) Serial.print("0");
    Serial.print(data[i], HEX);
    if (data[i] != tag1[i]) {
      tag1_card = false;
      digitalWrite(6,LOW);
    }
     
  }
  
  if (tag1_card) digitalWrite(6,HIGH);
  
  
  RFID.write(0xAB);
  RFID.write(0x02);
  RFID.write(0x02); 
 
 }