RFID Access Control System using Arduino
RFID technology is used for a wide variety of applications including access control, package identification, warehouse stock control, point of sale scanning, retail anti-theft systems, toll-road passes, surgical instrument inventory, and even identifying individual sheets of paper placed on a desk. RFID tags are embedded in name badges, shipping labels, library books, product tags and boxes, installed in aircraft, hidden inside car keys, and implanted under the skin of animals or even people. RFID systems work on a wide range of frequencies, have a variety of modulation and encoding schemes, and vary from low-power passive devices with range of only a few millimetres to active systems that work for hundreds of kilometers.
RFID tags are produced in a wide variety of physical form factors to suit different deployment requirements. The most commonly seen form factor is a flat plastic card the same size as a credit card, often used as an access control pass to gain access to office buildings or other secure areas. The most common form by sheer number produced, even though you may not notice them, is RFID-enabled stickers that are commonly placed on boxes, packages, and products. Key fob tags are also quite common, designed to be attached to a keyring so they’re always handy for operating access control systems.
This project uses a pre-built RFID reader module to interrogate commonly-available passive tags, looks up the tag ID in an internal database, and release a lock using an electric strike plate if the tag is authorised.
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