The Arduino then processes the knock pattern and compares it to the pre-programmed secret knock. If the pattern matches, the Arduino activates the motor to unlock the door.

The touch sensitive lock uses the CapSense Arduino library. By turning the door handle into a touch sensor, [Rob] allowed a secret code to be saved in the EEPROM. Repeating this sequence when the ...

Patrick has this week launched his 19th Kickstarter campaign to raise the funds he requires to take his new Arduino compatible secret knock lock ...

Steampunk Secret Knock Lock One of the most visually stunning Arduino-based projects around is also one of the simplest from a circuit perspective: the Steampunk Secret Knock Detecting Workshop Door.

[Andrea] just sent us this great student hack he made for his room. He’s constructed an Arduino keypad door lock — without using any proper fastening hardware! The entire build is made out of ...

Steve Hoefer’s secret knock detector is little more than a piezo speaker, a tiny gear reduction motor, an Arduino and some PVC pipe—basically a bunch of stuff he had lying around the lab.

Perhaps you could create an Arduino device to lean on the door right before the Arduino device bolts the door. It's not clear if the lock unlocks the door when you close that incognito browser.

This kit uses a CD-ROM drive and an Arduino board to build a clever robotic lock. This dude used a bolt to create the project and it's voice activated.