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If want you can make NFC based security door lock and for that you will need a few essential components like:
and a receiver coil that detects changes in the magnetic field caused by the presence of metal
Offline storage function
One relay output control interface
and live a wonderful life
125 KHz ID Tags RFID ABS Coin with Hole Prototyping Boards If want you can make125 KHz ID Tags RFID ABS Coin with Hole This is a 125 KHz ID Tags RFID ABS Coin with Hole. Uses EM format RFID signal: 125Khz Non contact reading Very durable (Over 20 years usage life) Completely waterproof, all weather that can be used reliably in rainy, snowy, dusty, or other adverse environments Passive and no power required for operation. From 125kHz low frequency to 13. 56MHz high frequency as well as with ultra high frequency. Thus providing an