DIY Detector Opens Doors Upon Correct Knock
November 6, 2009 by Rico Mossesgeld
Filed under Household
This is so cool! The brainchild of Steve Hoefer, the “Secret Knock Detecting Door Lock” attaches to a doorknob and its corresponding lock with suction cups. Upon detecting the correct knock pattern (by default, the classic shave and a haircut), it unlocks the door to grant access.
Even better, the knock detector is completely programmable. Changing the secret knock cadence is a simple matter of holding the red button while executing a new lock pattern, with a max of 20 knocks. The system simply detects the pattern, and not the tempo, providing allowance for users who knock slower or faster than …read more
