RFID Door Lock Access Control System | Smart Door Lock with RFID and Arduino Uno | MINI Projects

[@YigitOzmez]

How can I define more than 1 card at the same time? Like Master Card?

[@mohamedatheef6284]

you have to set "OR logic" with your RFID tag UID's.....

[@JarheadCrayonEater]

You could just buy a manufactured lock for around the same price, that's been tested and installed.
You didn't show it installed.