Secret Knock Detecting Door Lock
Have you and your friends ever had some secret knock to gain entrance to your secret, awesome hideout? Your friend knocks on the door in a certain sequence and, if executed correctly, you walk up to grant him/her access in to your epic man-fort.
Well, now you can automate that gruesome process with this secret knock detector. Made with an Arduino microcontroller, a knock sensor, and PVC pipe, this device automatically recognizes sequences of knocks and will unlock the door appropriately. Using this advanced contraption, you can now prevent cootie-infested girls from entering your protected cool-zone.
[ Link ] [ Sample Video ]
