2015-07-18 (Sa) RFID Car Access

Success with communication protocols and Arduino has been rare for me.

Enough background.

RC-522 RFID module and Arduino Pro Mini were given header pins and sockets to connect the with a breadboard but no communication could be established. Instructions online called for an Arduino Uno which was not available so a direct pin-to-pin diagram was not found. Presumably internet available code could be found which would establish communication. Hours were spent trying to establish communication.

While researching the RC522 chip it became evident that it was for for 13.56MHz chips like NFC rather than 125kHz like the most recent implant. This is fortunate since the RC522 should be able to read serial number data from the NFC chip implanted a year ago. NFC has been a great level of mobile phone security for a year.

Components as they were shipped

Soldered Arduino and RFID module

Commercial readers for 125kHz RFID tags were common and inexpensive. Eight dollars was enough to buy a device commonly used to unlock car doors with RFID authentication. The device has an all-weather antenna, processing/control unit, power leads, and a transistor module to control line voltage to a device, 12 volts in this case. The device could conceivable perform any on or off function in a vehicle including ignition if the car didn't need a transponder key.

Commercial RFID Authenticator

Previously a different model was looked at which was owned by the president of Twin Cities Plus. His device used an internal relay which was held high whenever a valid tag was present. Instead of an internal relay the purchased version used an external solid state switching device to control line voltage. A coaxial power receptacle was soldered in place so a power adapter (wall wart) could power the device. Using the "master tag" the implanted RFID tag was taught to the device. Video was shot which used a light to demonstrate how the device recognized trained tags including the implant.

Power receptacle

Video showing trained tags

To do:
  • Interface with remote unit
  • Add circuit to car
  • Install device
  • Add enclosure

The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.
Completed projects from year 2

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2015-07-17 (F)