Apologies for the above post. For the RFID, I tried using pins 6 and 7, rather than 3 and 4 (took inspiration from this Bahri Meriç Canlı on Instagram: "Arduino Uno + Ethernet Shield + RFID RC522") and now everything works as it should.
Apologies for the above post. For the RFID, I tried using pins 6 and 7, rather than 3 and 4 (took inspiration from this Bahri Meriç Canlı on Instagram: "Arduino Uno + Ethernet Shield + RFID RC522") and now everything works as it should.