Wouldn’t it be cool if you could just knock on your front door, and have it open automatically without having to fumble around with your keys? If that sounds like a dream come true, then you might ...

Hideouts can’t be protected with a simple lock and key, those jobs require passwords or secret knocks. For the latter, you can go the extra mile and build a knock ...

DIYer Steve Hoefer has been hard at work making every 6 year old's dream come true: A device that unlocks your door whenever someone seeking entrance taps out the secret knock. His device, which fits ...

Watch any movie about the years of prohibition, and you’ll probably see character gain admittance to a speakeasy by using a secret knock on the door. In the old movies, a little sliding door would ...

Regular garage door openers are dull; why aren't you using a knock-controlled mechanical iris to authenticate visitors instead? BFarn has been detailing his beautiful secret-knock detecting door ...