Arduino RFID Reader RC522 + Access Control System

I just received my RC522 RFID reader and made this simple Arduino access control system that uses the reader, a buzzer for the alarm and a relay shield for the security system. The relay can be used to open a door lock and if you need a louder alarm then you can replace the small buzzer with a high power siren. I will not talk about the RFID reader because you can find a lot of information about it on the w ...

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