IButton Is Opening Doors At The TkkrLab

Finding alternative ways to unlock doors is a favorite hacker pastime. TkkrLab recently took on the challenge themselves. The hackerspace, which is located in the Netherlands, faced a problem common to communal workshops; how could they manage keyed access for a large number of members? The metal keys for the door are special, and cannot be cheaply duplicated. To further compound the issue, they are not the only tenants in the building so they can’t replace the lock with one that uses less-expensive keys. So they decided to add an electronic solution.

They first looked at a method for electronically opening the door. Often, this comes in the form of an electronic strike, but rather than alter the door jamb, they replaces the latching mechanism. The electronic latch was compatible with the original cylinder, which means the old keys still work in it. You can see the new assembly above. Just to the left of the lock is an iButton reader. We’ve seen this hardware in projects many times before. It’s cheap, and easy to work with. Now TkkrLab issues an iButton to each member, and can keep track of who is coming in door.

A Beginner’s Guide To Magnetometers

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The folks over at LoveElectronics recently published an article that explains some of the ins and outs of magnetometers for those who are interested in trying one out, but might not understand how to use them.

A good part of the article focuses specifically on how to manipulate the HMC5883L magnetometer from Honeywell, but a lot of the information can be applied to other makes/brands of compass sensors. They start out discussing in very basic terms how the compass works, then delve into some specifics on how to interface the chip with an Arduino, courtesy of a breakout board that they sell. The breakout board is actually quite simple, so any number of custom iterations could be built for your own testing purposes.

They walk through the use of an HMC5883L-specific Arduino sketch they produced, making it easy for beginners to start getting useful data from the compass units. While a pre-made sketch might seem like a bit of a cop out, it at least gives the curious/motivated beginner a chance to look at some completed code in order to see how things work.

If you are interested in cutting your teeth on some additional beginner concepts, check out these other how-to articles and tutorials.

Incredible 1000 MW Iron Man Repulsor Beam

awesome_hand_mounted_repulsor_laser

German lab technician by day, hacker by night [Patrick Priebe] has done it again, this time strapping a ridiculously high-powered laser to the palm of his hand. Earlier this year, we showed you an awesome Neodymium:YAG pulse laser pistol he built, and it seems he never takes a rest from constructing crazy laser projects.

[Patrick] is a huge Iron Man fan, and his palm-mounted laser unit was built as an ode to his all-time favorite super hero. Crafted to invoke images of Iron Man’s repulsor beam, his laser uses a 1000 mw 445 nm laser diode to get the job done. if you happen to be keeping track, that makes his DIY laser just as powerful as the WickedLasers Spyder 3 Arctic – THE benchmark in portable handheld lasers.

Like his previous builds, we can’t seem to find a whole lot of information about the laser’s construction process. We do know however, that the unit was crafted from a 2mm thick sheet of brass, which fits nicely on his hand while simultaneously acting as a very large heat sink. This large surface area allows him to run the laser continuously for three minutes before requiring a cool down, which is no small feat.

We think it’s an awesome project, and as you can see by the videos of the three separate revisions it has undergone, [Patrick] is quite serious when it comes to perfecting his wares.

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ND Sticks It To Traditional Gaming Giants

What do you do if you’re a developer that gets shut out of the approval process for closed-shop gaming systems? If you’re [Robert Pelloni] you protest first, then establish your own startup to develop a gaming platform that is open and inexpensive. The hardware seen above is a rendering of the nD, a cheap and open gaming handheld. They plan to sell it at cost ($20) and let anyone develop games.

Check out the video after the break to see the pitch. The hardware is sparse; a plastic case and some buttons, a 320×240 LCD screen, a PCB with a system-on-a-chip, and a rechargeable battery. But if you’re writing great games the spartan hardware doesn’t matter (we still love a good game of Metroid when we have the time). Developers will be able to license games for sale in the nD online market. They’ll keep 90% while nD takes it’s 10%. Not a bad deal.

If you haven’t heard about [Bob] protesting Nintendo, give this article a gander.

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IOIO Upgrades Get A Bit Easier

The IOIO, a breakout board for Android phones that predates the Android Developer Kit hardware, is a now a little bit easier to upgrade. That’s because [Ytai’s] IOIO manager app just his the Android market. The PIC24F that sits proudly on top of the board has always been running a bootloader, but for security reasons it is programmed to only talk to apps that have been officially signed. Now that there’s an app that meets this qualification, you can upgrade the firmware from your phone without the need for an external programmer.

What about the bootloader itself? Surely that will need upgrades over time, right? Well, yes. [Ytai’s] announcement today also came with an option for upgrading the bootloader but with one caveat. You’ll need two IOIO boards to complete the upgrade. One connects to the phone and becomes a programmer, while the other lays back and waits for a refreshing code flash.

Omniwheel Robot

Like all of us, [Jonathan Guberman] has a list of projects and builds that ‘will get done when I have time.’ His Kiwi drive robot is no exception. It’s intended to be one piece of a much larger project, but he decided to document it anyway (we think in the hope of getting is rear in gear).

The robot uses a holonomic drive to get around. A holonomic drive uses three fixed wheels placed 120 degrees apart. The wheels can be independently controlled and with some vector addition the robot can move in any direction and rotate 360º inside its own wheelbase. Of course the wheels will have to be able to roll in two dimensions, so an omniwheel is used. Everything is controlled with a Wiimote nunchuck, and the movement is very smooth.

[Jonathan] has had a few projects featured on Hack A Day before, like his Mechanical Pac-Man and his adorable Portal turret plushie. [Jonathan] really demonstrates his artistry and skill in his project, so we’re really wondering what his ‘larger project’ actually is. Take a guess in the comments section, that might get [Jonathan]’s rear in gear.

Check out the video of the omnidirectional robot after the break.

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Replacing Non-standard USB Charging Ports

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While many mobile phone manufacturers are moving towards the micro-USB interface as a standard, others such as Apple and HTC are still bucking the trend. Part of [arto’s] job includes repairing mobile phones, and last month he found himself faced with a pair of broken HTC handsets that needed their charging ports replaced.

Replacements for HTC’s proprietary connectors are apparently quite hard to find, and [arto] says he had to source them from an HTC repair center. With the proper parts in hand, he could finally get down to work.

The HTC Hermes handset he repaired was a breeze, as it had plenty of space available around the charging port. He said that this allowed him to replace the jack pretty easily, but the HTC Touch Dual was a mess in comparison. He started by removing the old adapter, which was done by cutting it out bit by bit. He says that he did it this way rather than desoldering, due to its proximity to other heat-sensitive components. After some careful soldering under a microscope, everything was back in working order.

While his repairs are not necessarily the things that hacks are made of, the information is still quite helpful. Broken charging ports are extremely common among smart phones, and with plenty of these older models still floating around, his pointers just might help someone save a few bucks on a replacement phone.