Follow mercenarymind on Twitter
USRP 101: unlocking wireless PC locks (and freeing dolphins)
Written by Dangerus Prototypes   
Monday, 01 August 2011 00:00

Authors: Dangerus Prototypes

We’ve been interested in the Universal Software Radio Peripheral (USRP) SDR and the associated open source GNU Radio softwarefor some time, but the $1500+ cost has kept the project on the back burner. Nevertheless, we always like a good story about RF hacking with the USRP.

Corey and Max saw a wireless USB Proximity Lock in use in their office and wondered how difficult it would be to hack it open using the USRP. The principle behind these locks is simple: when the associated fob is within range, the USB attached dongle sends a message to the PC locking software which then permits access to the PC (and also frees you from the “dolphin” lockscreen.)

In this tutorial they describe the steps they took to using a USRP to conduct a record and replay attack on the fob-dongle wireless link. While you may think it’s overkill to use this type of expensive RF equipment to hack a $20 lock, the point is to demonstrate the steps involved in coding in GNU Radio to use the USRP to analyze and attack wireless protocols.

Via Intrepidus Group.

Last Updated on Monday, 01 August 2011 00:29
Homemade PID Controlled Hotplate
Written by admin   
Monday, 25 July 2011 00:00

Authors: admin writes:

Hot on the heels of my last hack (no pun intended), is my latest project, a PID (proportional – integral – derivative) controlled hotplate. The inspiration for this project came from this post on I choose to build it because I wanted to increase my knowledge on PID controllers and also wanted to get into soldering surface mount components. I got lucky and got all of the components for this project for under $20. Check out after the break for the build details.

Homemade PID Controlled Hotplate - [Link]

Last Updated on Thursday, 21 July 2011 22:03
Servo-Actuated Door Keylock Hack with capacitance touch-pad
Written by Electronics lab   
Thursday, 21 July 2011 00:00

Authors: Electronics lab

touch lock writes:

I believe that kids (and not only kids) that have their hands on electronics, wanted at least once in their lives to make an electronic keylock system for their house or room. When i was a kid, i had bought a Smart Kit Keycode lock system, and i had adapted it on the external door of my house. But this door had already the automatic-release mechanism. I only had to find which wires actuate this mechanism and hook the relay of the kit in parallel to this.

Then, i discovered that making a key-code circuit, is simple, very simple. As a matter of fact, so simple, that i designed this very simple key-code circuit, similar to the one from smart-kit but much better (mine had automatic reset operation when wrong code was entered), which took me only a few hours to design. Not to mention the microcontrollers… But why don’t i have a keycode-lock for my apartment.

Read More: PCBHeaven

Last Updated on Thursday, 21 July 2011 00:36
The Whack A Mouse Project
Written by Administrator   
Thursday, 21 July 2011 00:00

Inspired by my friends at Toymaker Television, I decided to build an interactive Cat toy thingy. After some thought, I figured that a toy mouse poking it’s head out of a hole might be fun. When the Cat whacked at the mouse, it would disappear inside the hole and then another mouse would pop out of a nearby hole! This could be lots of fun for a Cat!

So, then I thought about how to make all this happen. At first, I thought about using a micro controller and some sensors, but no, as usual I wanted it to be simple. After some more thought I realized that I could do it all with a few switches and a pivoting lever, and so, I got started making a plan. Now, when I plan something. I literally sleep on it. Things just come to me in my sleep, or I’ll wake up with a solution to a problem. That’s how this project got designed… I slept on it for a few days.

After I had a solid idea in mind, I sat down with pen and paper and a few drafting tools like a divider, a ruler, a circle template and a pencil. I drew out a design, then made a working 2D model of the mechanism. Once I worked out all the details, I built the heart of this device, the central lever that holds the two mice and functions as an actuator for several switches. I decided to use an RC servo to do the work so I opened one up and modded it to free rotate past 180 degrees, and wired it direct to the motor, Basically, I turned it into a gear reduction motor.

Then it was time to put it all together, which took about 10 hours over two sessions at the bench! A lot more time than I would have estimated, but there were several problems that came up that had to be solved. That’s what rapid prototyping is about. Solving problems quickly. Along the way I made a few changes and additions.

Finally, I had a working device. Time to let the Cat, Seamus, have at it….

Talk about an anti-climax! He was not only disinterested in it, he was a bit freaked out by it and didn’t want to be near it! What the hell? Mouse filled with Cat Nip… interactivity… nope. Seamus would rather just go sleep. Ahh Kittehs!

Not to be let down, I let Sophie the Dog have a go at it. She was pretty excited about the ball launchers so why not! Well, she loved it! As you’ll see in the video, sometimes projects end up working differently than you had planned, or even thought of. It’s not a failure… it’s a surprise and a realization that your project has more applications that you had originally thought of, or conceived. Bonus!


Read More Hackolog

Last Updated on Thursday, 21 July 2011 00:25
Laser Tag Hack
Written by hackolog   
Thursday, 21 July 2011 00:00

Authors: hackolog

laser tag

Believe it or not, there are hardcore laser tag players who fight to the death in abandoned military bases, using incredible, highly modified custom guns. To start with, you will need a microcontroller, a photoresistors, and plenty of cheap laser diodes with collimators lenses. By using the photoresistors to have the microcontroller learn your lasers signal, ...

Read more:

Last Updated on Thursday, 21 July 2011 00:13
<< Start < Prev 1 2 3 4 5 6 7 8 9 10 Next > End >>

Page 3 of 36