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 << 24;
cardId += mfrc522.uid.uidByte << 16;
cardId += mfrc522.uid.uidByte << 8;
cardId += mfrc522.uid.uidByte;
BUT - when I use another buyed card reader I am getting number “3271084853”. I know how to get it - I can take HEX UID backwards - in this example C2 F8 CB 35, convert it to DEC and we have “3271084853”.
Ok, can anyone help me how to do it in arduino and as result have string that I can pass to call URL (I know how to call it / it is working well… only this last think is missing). I am solving this for two days and I am lost…
Thank you for any help