ookseer, YouTube (October 29, 2009)
video, 2:12
"Unlock your door with a secret knock. More information, source and schematics at http://grathio.com"
This could be the early 21st century's equivalent of those old clap on-clap off light switches.
It's pretty cool technology, as far as I'm concerned - and could be fun to use for some rooms in a large house. As a serious security device, I'm not so sure: seems to me that there's too big a chance of someone hearing the sequence of knocks, and remembering it. A surprising number of people 'got rhythm.'
Still: It's cool technology, and looks like fun.
On http://grathio.com:
- "Knock Lock Kit Update & Mailing List"
Steve Hoefer (November 11, 2009) - "Secret Knock Detecting Door Lock"
Steve Hoefer (November 2, 2009)
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