i've been reading Hacker News forever and just now created an account to share my project similar to this...
I built mine a couple years ago. I 3d printed most of the parts on a Makerbot Thing-o-matic. It uses 24 rare earth magnets built into the feet to attach to the door over the deadbolt. There is a 3d printed sleeve that slides over the deadbolt lever and turns with a servo.
A piezo sensor on the frame of the device detects knocks on the door. knock the correct pattern (shave and a hair cut, two bits, for example), and the servo turns the deadbolt.
It is easily modified with an ethernet sheild to be controlled with my phone when within range of wifi outside the house...
I still plan to do a proper write-up and share the source code and stl files for printing- i just havent gotten around to it yet. I've got a few other unique projects I'd like to share as well, I just need some time to organize some photos and info.
thanks! no, I don't have the models up on thingiverse, but I plan to put them up there and to document the build. I'd like to start documenting more of my builds as well. I'm going to work on promoting myself and my work better as it's something I've not spent much effort on recently.
I enjoy reading stuff like the original post here and am always looking for such content but so easily forget that I could be sharing my projects and methods... perhaps time to stop lurking so much :)
I built mine a couple years ago. I 3d printed most of the parts on a Makerbot Thing-o-matic. It uses 24 rare earth magnets built into the feet to attach to the door over the deadbolt. There is a 3d printed sleeve that slides over the deadbolt lever and turns with a servo.
A piezo sensor on the frame of the device detects knocks on the door. knock the correct pattern (shave and a hair cut, two bits, for example), and the servo turns the deadbolt.
It is easily modified with an ethernet sheild to be controlled with my phone when within range of wifi outside the house...
I still plan to do a proper write-up and share the source code and stl files for printing- i just havent gotten around to it yet. I've got a few other unique projects I'd like to share as well, I just need some time to organize some photos and info.
photo: http://now.oldman.ca/lib/img/bg/heimdall.jpg video (early test): http://www.youtube.com/watch?v=5zFRAlZB0Sw&list=UUl6Pnlqx1eh...