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This is an amazing instructable, thank you for your time and effort, greatly appreciate it!just wanting to know how to change it so you could have more than one master cards? I am wanting to make it so that the mastercards are set within the actual code before the system turns on, so if the system resets, I don't need to make a new mastercard.
Arduino RFID-RC522 - DOOR ACCES CONTROL/ RFID DOOR LOCK
Arduino RFID Door Lock