Our earlier smart-lock project used a pre-stored card ID to grant access; this project takes the same MFRC522 reader in a different direction — a trash…
A practical MFRC522 and Arduino access-control prototype with correct wiring, power separation and a safe path from LEDs to a real lock actuator.
Explaining how RFID works and the MFRC522 reader module, which runs on 3.3V logic over SPI, plus reading a card's ID from Arduino.