Hi! I have been adding cards to the arduino (I tap them then it says “successfully added”) but when I tap them after to test if they really are added it says access denied to the system (only the 1st I added to the system is successful in the process - meaning only 1 card does have an access to the system). What seems to be the problem for this Gentlemen? I get this code to this website and I’m just following instructions from his site (I’ve added some modifications to his project tho). The code is attached below. Thank you for your answers!
Tap_Card.ino (14.7 KB)