Grathio Labs of Steve Hoefer
Steve Hoefer, the main brain behind Grathio Labs. A freelance problem solver and writer. Active in the Open Source software and hardware. The Secret Knock Detecting Lock unlocks your door when it detects the correct knocking sequence.Protect your secret hideout from intruders with a lock that will only open when it hears the secret knock.
This started out as a bit of a joke project, but turned out to be surprisingly accurate at judging knocks. If the precision is turned all the way up it can even detect people apart, even if they give the same knock! (Though this does trigger a lot of false negatives, which is no fun if you’re in a hurry.)
