Quick and Dirty RFID Door Locks Clean up Nice

homemade RFID Door Locks

[Shawn] recently overhauled his access control by fitting the doors with some RFID readers. Though the building already had electronic switches in place, unlocking the doors required mashing an aging keypad or pestering someone in an adjacent office to press a button to unlock them for you. [Shawn] tapped into that system by running some wires up into the attic and connecting them to one of two control boxes, each with an ATMega328 inside. Everything functions as you would expect: presenting the right RFID card to the wall-mounted reader sends a signal to the microcontroller, which clicks an accompanying relay that drives the locks.

You may recall [Shawn's] RFID phone tag hack from last month; the addition of the readers is the second act of the project. If you’re looking to recreate this build, you shouldn’t have any trouble sourcing the same Parallax readers or building out your own Arduino on a stick, either. Check out a quick walkthrough video after the jump.


  1. notdave says:

    cool project! its too bad these cards are so trivial to clone (without you detecting it!) i think it would actually be more difficult to steal/clone a physical key!

  2. lingnau says:

    I actually wanted to see it but the video is tilted.

  3. Doris Kim says:

    I really like to hit him for not filming in portrait mode ….

  4. Anne Nonymous says:

    Nice, but wow, that is some of the worst most redundant code I have ever seen.

  5. Jimmie says:

    No comment on the project itself…but that’s a nice optical illusion in the pic. I had to a drag shell window down to verify that the edge of the carpet in the pic was indeed a straight line…

  6. Galane says:

    I want to see someone put an RFID key into a sonic screwdriver for unlocking doors.

  7. Tiago Dias says:

    You’re not shooting that right, dummy!

  8. h3ll0_w0rld says:

    Looks like time for another link to this:

  9. h3ll0_w0rld says:

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