I’ve just got my NExT registered to be my keycard to my gym. It scans correctly, and it’s registered in the system seemingly correctly. But it doesn’t unlock the door or gates.
I’m unsure if there’s some encryption that my chip is missing, but it’d surprise me as the keycard is just a cheap mass produced rfid card.
Any suggestions to fix it. I have full access to the gym’s computer system, if needed
If you compare an actual card and your NeXT with NFC Tools for instance , do you see any difference?
I’d say step one is to test the door reader with the RDC and see if it’s possibly dual frequency.
I have an iPhone so I can only read the high frequency NFC, where the keycard is rfid. I can whip up an Arduino reader if that can help me
RDC? What’s that? The door reader reads my chip, and gives off a beep
The purpose of using the RDC is to determine if the reader is multi-frequency. If so, the wrong chip inside your NExT might be getting read by the reader and causing it to beep, but the wrong chip ID is being reported back to the door controller.
Good idea to make RDC an automatic keyword with the link to the page 
I didn’t get anything other than the chip and inserted. But I bought it from a German store so maybe they just didn’t sell that part.
I have a high frequency NFC tag lying around. Could I try that to see if it reads that? Would that be similar?
Of course the resident AI is able to do it!
