RFID based Door lock

RFID is Radio Frequency Identification. An RFID reader is used to read RFID tags (which contain certain unique data stored in a chip). An RFID reader and an RFID tag, both have a coil surrounding them.  When an RFID tag is shown near an RFID Reader, it collects the unique tag data (a combination of digits and characters) from the RFID tag.

Hardware requirements:

  • Arduino
  • RFID Reder & Tag
  • LCD Display
  • Locking System/ Mechanism
  • Regulated Power Supply 

Software requirements:

  • Arduino IDE 

How does this work?

This is made possible via Electromagnetic Induction. I told you, both RFID reader and RFID tag comes with a coil in them. We power the RFID reader from the power supply for reading purpose. Now when an RFID tag is shown near the reader, electromagnetic induction will take place between the coils and these powers the chip inside tag. This chip will send data electromagnetically to the reader. The reader will receive this electromagnetically transferred data and outputs it serially. Every RFID reader comes with Serial output pins. We can collect the read data through these serial pins using Arduino or any other microcontroller.

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