Post : Knock lock balks knock, uses CapSense without shock
URL : http://hackaday.com/2012/08/06/knock-lock-balks-knock-uses-capsense-without-shock/
Posted : August 6, 2012 at 3:00 pm
Author : Brian Benchoff
Tags : capsense, knock lock
Categories : arduino hacks, security hacks

http://hackadaycom.files.wordpress.com/2012/08/knock.png

[Rob Hemsley] sent in an update to an RFID-based door lock. Previously, if you wanted to enter the MIT media lab, a RFID-enabled card was required to get in. Now, with [Rob]'s update, you only need to tap the door handle in a 'secret' pattern (http://www.robhemsley.co.uk/knock_lock.html) .

The earlier RFID-enabled build used about $80 in hardware, not a very economical solution. The new touch-based solution only uses an Arduino and servo, making the build much cheaper.

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 door is locked sends power to the servo, unlocking the door.

A very cool build that's also a little more secure than the traditional, audible knock lock. Check out the video after the break.

Read more of this post (http://hackaday.com/2012/08/06/knock-lock-balks-knock-uses-capsense-without-shock/#more-81962)

Add a comment to this post: http://hackaday.com/2012/08/06/knock-lock-balks-knock-uses-capsense-without-shock/#respond

--
WordPress.com | Thanks for flying with WordPress!