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Inspired by several door-unlocking mechanisms I've seen on hackaday.com, I decided to create one on my own. This one has a two-button interface; one to start and end the password submission, and one to actually tap in the rhythm that is your password. There is also a status light. I was able to build this really cheaply using parts I had scavenged over the past few months. The only things I had to pay for were the microcontroller itself, which was $21 (http://www.pjrc.com/teensy/), and some picture hanging wire which I had from before.
It's lots of fun to tap in the Star Wars Theme or something to enter my room. Now, I don't have to worry about locking myself out of my room again! Plus, it feels good and geeky.
It's lots of fun to tap in the Star Wars Theme or something to enter my room. Now, I don't have to worry about locking myself out of my room again! Plus, it feels good and geeky.
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Signing UpStep 1Parts and Tools
I chose the Teensy because this is my first microcontroller, and I don't have a programmer yet. The Teensy only requires an A-miniB USB cable and free software to install, compatible with Mac/Windows/Linux. Also, it's really easy to upload the hex file; just compile, and press the button on the Teensy.
The cost of this project to me was $21, plus the picture-hanging wire.
Parts from the street came from a coffee percolator (relay, LED, capacitor) and a router (LED, modular jack, power jack, capacitors). Free samples were the 7805 5-volt regulator, buttons and switch. I also found lots of stuff in the "broken parts" box in my EE lab: banana connectors and cable, wire, the sn754410 driver, a four-pin header and resistors. I had an extra laptop charger lying around that I used for power, and an Apple modem cable whose tab was broken.
Other hardware: a wall plate.
I used a hot glue gun, a soldering iron, a needle file and a power drill, which are pretty standard. The most unusual thing I used was a long, flexible grabber tool.
The cost of this project to me was $21, plus the picture-hanging wire.
Parts from the street came from a coffee percolator (relay, LED, capacitor) and a router (LED, modular jack, power jack, capacitors). Free samples were the 7805 5-volt regulator, buttons and switch. I also found lots of stuff in the "broken parts" box in my EE lab: banana connectors and cable, wire, the sn754410 driver, a four-pin header and resistors. I had an extra laptop charger lying around that I used for power, and an Apple modem cable whose tab was broken.
Other hardware: a wall plate.
I used a hot glue gun, a soldering iron, a needle file and a power drill, which are pretty standard. The most unusual thing I used was a long, flexible grabber tool.
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Dec 19, 2009. 1:53 AMallenrodgersjr
says:
do you have a video of it in action? great instructable!
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1
May 14, 2010. 7:14 PMMusashiAharon (author)
says:
The electronic lock now has a video. Enjoy!
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1
Dec 20, 2009. 9:20 PMMusashiAharon (author)
says:
Thanks! Unfortunately, I had to disassemble it because I left my dorm for winter break. When I get back in about a a month, I plan to reassemble it and take a video. Reassembly will definitely be one of the first things I do - I think I'm going to need this thing several times when I forget my room key. Luckily, I designed all the modules so that it is quick and easy to put together - it took only about 10 minutes to disassemble, so I think I will be able to plug it back together just as easily.
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