Ok so I will teach you how to make a data reader with arduino and RFID for RFID cards. The data results are shown in the serial monitor.
Step 1: Requirements
-A PC with arduino IDE on it
-2 resistors of 220ohm
-An RFID-RC522 reader and cards
Step 2: The Electric Part
Assembly the components just like in the sketch!
Connect the + wire to the 3v pin else the circuit will fry!
Step 3: The Code
Just paste the code into a clear arduino IDE file and upload it! Don't forget to check the COM port and board type! Also, look in the code's comments carefully!