Hello, I have MFRC522 and need sent UID to server. For this example I have card with UID: 35 CB F8 C2 (this I can get by mfrc522.PICC_DumpToSerial(&(mfrc522.uid)); ). This basic way is returning decimal UID : "00-2048194" cardId = mfrc522.uid.uidByte[0] << 24; cardId += mfrc522.uid.uidByte[1] << …

mfrc522 UID - converting to dec - #4 by system - Programming

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