RFID reader for BuildBrighton door pt II

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Chris HoldenĀ has written an article on theirĀ new door entry system at BuildBrighton:

The basic idea is this:

  • A keyfob is presented to the reader and the serial number read from it.
  • The keyfob number is displayed on the character LCD.
  • This is sent (via the ethernet module) to a URL to validate the serial number and the web site returns data to say who the key belongs to
  • If data is successfully received from the website, it is stored in the local eeprom chip
  • If there is a fault and no data can be received from the ‘net, the eeprom is searched, looking for a matching keyfob number. If a match is found in eeprom, the data is read out and handled as if it had just come from the website.
  • If the keyfob belongs to a valid user, their name is displayed on the character LCD and a relay is activated to open the door.
  • If the serial number is not recognised, a “not recognised” message is displayed in the lower part of the LCD display.

Check out the video after the break.

Schematics for RFID door entry system.

 

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