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Oh man tricky subject to learn if you are a begginer. If you didn't try this library, you should check if it will work for you https://github.com/miguelbalboa/rfid. This guy made it so easy to learn from his code. It would help if you tell us witch board you are useing and what code did you write. But to sum up your dilema. You can't use IRQ pin for the thing you want, that first. Second if you want to write your code to just blink an LED when a card is near, the chip(the rfid chip info from the datasheet) needs to do this: 1. Do a slef-test 2. enabel the correct registers for it to just turn on 3. make the led blink when something is near. The self-test is maybe not needed but it worked for me so i included it in my code. In his library, MFRC522.cpp, you have on line 198 PCD_Init() function there he writes to some registers to enable them