The MFRC522 RFID reader module is available at low cost and allows easy experimenting with MIFARE RFID tags and cards.
Here's an overview of how RFID works, a demonstration of reading and writing data in the 1K MIFARE EEPROM sectors/blocks, and a sample project incorporating an RFID access control system that can be used as the basis for a door lock etc.
Sketch & Wiring Diagram
https://github.com/GadgetReboot/MFRC522
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Datasheets
https://www.nxp.com/docs/en/data-shee...
https://www.nxp.com/docs/en/data-shee...
RFID General Info
https://www.researchgate.net/publicat...
https://www.researchgate.net/figure/S...
https://www.engineersgarage.com/artic...
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