Secret Knock Detecting Door Lock - Made by Steve Hoefer - The Diigo Meta page

• 17 Dec 09
  

  Sam Harris

  new invent
  

  door secret knock invent

• 18 Nov 09
  

  Valeriano Sousa

  knock invent lock door

• 16 Nov 09
  

  Arlene Knapp

  amazing invent!
  

  secret knock door look invent

• 

  Bruce Nelson

  awesome!!!!
  

  invent secret knock new invent

• 11 Nov 09
  

  Brian Collins

  good idea!!!!!
  

  invent door new invent

• 05 Nov 09
  

  Rob Karney
• 

  Phil Cook

  diy deadbolt lock arduino build

• 

  Cathy Emery

  secret detecting knock sensor ICT ISS

• 04 Nov 09
  

  Adam Pie

  knock detecting secret

• 02 Nov 09
  

  Steve Dickie

  ow many times have you seen a secret hideout with a secret knock?  It's a staple of cheesy dramas, Saturday afternoon movies, and tree houses throughout the world.
  
  While working on another project I ran across the Arduino knock sensor tutorial.  Sensing a single knock is a great little project for learning about microcontrollers, but what about sensing specific knocks?  Seeeeecret knocks?  And if we could detect a secret knock, shouldn't it unlock a door?   If you can't tell by looking this was cobbled together from spare stuff around the lab, it's not much more than a piezo speaker, a tiny gear reduction motor, and an Arduino. And PVC pipe.  How about a video to explain:

  arduino electronics project

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