A tap-sensitive panel beneath an ornate steampunk mechanism offers artistic security.

A designer who goes by the name BFarn has created a knock detector lock in the form of a mechanical iris for authenticating visitors. As he documents on his site, BFarn used a combination of projects by other DIY  inventors to create his secret knock detector  for his workshop door.

I combined Chris Schaie’s beautiful Mechanical Iris, Steve Hoefer’s Secret Knock detecting Arduino code, and an engraving made with my scratch-built CNC-Router to make the entrance to my garage/lab a bit more special.  These people all inspire the hell out of me, and I just want to feed a little bit of that back to the source.

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