MFRC522 rfid

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hi bought mfrec522 rfid tags..i can compare uid of particular card other cards..so can give acces particular card..im trying use mfrc522 rfid sensor..whenever put card on reader read continuously uid of card(which want give acess),but want arduino should give me acknowledgment continuously whenever card not present on reader..so can put mfrc522 reader on fix bar of door  , tag on door...whenever try open door give alarm..plzz give me code



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