Final Key : A Mooltipass-like Device

January 21, 2014 by 5 Comments

Since the Hackaday community started working on our offline password keeper, Mooltipass, we’ve received several similar projects in our tips line. The Final Key may be the most professional looking one yet. Similarly to the Mooltipass, it is based on an Atmel ATMega32U4 but only includes one button and one LED, all enclosed in a 3D printed case.

The Final Key is connected to the host computer via USB and is enumerated as a composite Communication Device / HID Keyboard, requiring windows-based devices to install drivers. AES-256 encrypted passwords are stored on the device and can only be accessed once the button has been pressed and the correct 256 bit password has been presented through the command line interface. Credentials management and access is also done through the latter. Unfortunately, the Arduino source code can’t be found on [cyberstalker]’s website, so if you see interesting features that you would like to be integrated in Mooltipass you may send us a message to our Google Group.

Make Me A Drink, Drinkmo.

January 21, 2014 by 26 Comments

[Cabe Atwell’s] latest project is a work of art. Let us introduce the Drinkmotizer: a Raspberry Pi Drink Mixing Robot.

As [Cabe] says, almost every engineer has a drink-mixing robot on their project todo list. We’d probably have to agree; they’re functional, cool, and useful at parties.

You need the Drinkmotizer at your party… At some point, dexterity for drink mixing is lost at a gathering.

Drinkmo is your designated, sober, mixologist.

Your enabler.

Your friend.

Drinkmo works by rotating a long leadscrew that moves the mixing glass from bottle to bottle. The entire setup is made using aluminum extrusion, and is by nature, completely expandable. On the top shelf are gravity fed shot dispensers, controlled by 12VDC car lock actuators. The chaser station (at the end, on the right) works differently. The chaser bottle is actually pressurized by a paintball gun tank and dispensed using a solenoid valve. We hope he’s got a pressure regulator in there, considering the pressure capacity of paintball tanks can range from anywhere from 1000-3000PSI!

The entire system is controlled by a Raspberry Pi running Raspbian, and [Cabe] is using Tkinter for the GUI of the program. He’s got tons of info on the original forum post linked above (including the schematic!), and if you stick around after the break, there’s a very well produced video of Drinkmo in all its glory.

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Educational Circuit Box For Young Aspiring Hackers

January 21, 2014 by 9 Comments

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Here’s a great idea: an Educational Circuit Box you can make to get kids interested in electronics! What looks like a boring project box with wires sticking out might just become a box of wonder and curiosity for young ones.

[Fileark] built this for his son, and has happily shared it on his blog for others to recreate. As you can probably guess from the picture, it makes use of a project box, LEDs, buttons, switches, and female header pins. Using the included breadboard jumpers picked up off of eBay, it allows your kid to learn about circuits by plugging in different components and seeing what happens.

The majority of the parts he used were salvaged from scrap electronics he had laying about. It’s a great way to turn e-waste into something fun and educational for kids! For more information about the project, stick around after the break to see [Fileark] explain (and his son demonstrate!) it in a video.

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Retrotechtacular: How A Bicycle Is Made

January 21, 2014 by 24 Comments

Does your bicycle master boardwalk and quagmire with aplomb? If it was built by the Raleigh Bicycle Company, it ought to. This week’s Retrotechtacular is a 1945-era look into the start-to-finish production of a standard bicycle. At the time of filming, Raleigh had already been producing bicycles for nearly 60 years.

The film centers on a boy and his father discussing the purchase of a bicycle in the drawing office of the plant where a bicycle begins its life. The penny-farthing gets a brief mention so that the modern “safety model”—wherein the rider sits balanced between two wheels of equal size—can be compared. The pair are speaking with the chief designer about the model and the father inquires as to their manufacturing process.

We are given the complete story from frame to forks and from hubs to handlebars. The frame is forged from high-quality steel whose mettle is tested both with heat and with a strain much greater than it will receive in manufacture or use. It is formed from long pieces that are rolled into tubes, flame sealed at the joint, and cut to length. The frame pieces are connected with brackets, which are formed from a single piece of steel. This process is particularly interesting.

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A Meccano Pinball Machine

January 21, 2014 by 14 Comments

This pinball table is almost entirely out of Meccano Construction Set parts. [Brian Leach]’s Meccano Pinball Machine features a digit counter, a kick out hole, flippers, and a timer.

The digit counter is likely the most complex part of the build. By sending it an electrical signal, either the ones, tens, or hundreds digit can be incremented. The electrical signal engages an electromagnet, which connects a motor to the wheel to increment the score. A mechanism ensures the next digit is incremented when a digit rolls over from 9 to 0, and allows the counter to be zeroed.

Rolling the ball over the set of rollover switches increments the score. A mechanism is used to ensure that the switch will trigger with a small weight. Arcing was an issue, which was reduced by adding a snubber to suppress the transient.

The pinball machine was demoed at the South East London Meccano Club, and is a great demonstration of what can be built with the construction kit. After the break, check out a video of the pinball machine.

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Finding The Fix For A Dimmed 27″ IMac Screen

January 21, 2014 by 29 Comments

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Like many with a 27″ iMac, [Gerry’s] been experiencing some screen brightness issues. According to him, Apple’s been largely ignoring the problem and the community’s outcry, which led to [Kaos2k] poking around inside to hack together a fix. It’s a solution clearly born from trial and error; [Kaos2k’s] initial post on the issue simply recommending “applying pressure” to the panel itself, which would sometimes cause the dim screen to spring back to life.

It turns out that heat (or stress, or something) from the screen causes the solder joints to weaken on the board where a 6-pin connector hooks up, dimming the screen to eye-strain levels. Some Mac users are suing over it, because the problem tends to show up just outside of the warranty window and affects a large number of people. [Kaos2k], however, provided the much needed solution for those looking to get the fix over with: just solder the cable directly to the board. Our tipster, [Gerry], has documented his experiences over at his blog, and was kind enough to make a step-by-step video of the repair, which you can see after the break.

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Gamecube Robot Is More Than Meets The Eye

January 21, 2014 by 23 Comments

[Joshua] had his old Gamecube kicking around. Rather than let it gather dust, he took it into the machine shop at Harvey Mudd College and used its body as the shell of a mobile robot. With a bit of thought, it turns out that you can fit quite a lot inside the rather small Gamecube case. [Joshua] started with a couple of R/C plane style brushless outrunner motors. These motors generally give more torque and spin slower than their inrunner counterparts. Several thousand RPM was still too fast to directly drive the LEGO tires though. He needed a gear reduction.

Gears and tight spaces usually send people running for the SDP/SI website. We’ve used SDP/SI parts before, and have found that they make incredibly accurate gears and assemblies. Things can get pricey, however, when you’re buying two of everything. In search of a solution a bit more within his college-student-budget, [Joshua] looked at radio control servos. R/C servos have some rather strong output gears, especially the metal gear variety. Even with strong gears, parts do break in crashes, so replacement gear sets are available and cheap. [Joshua] settled on gears made for Hitec servos. His next problem was finding a pinion gear for his motors. That turned out to be easy, as 64 pitch gears commonly used in RC cars mesh with metric servo gears.  The final results are great. His robot has tons of torque and plenty of speed to zip around. The only thing it’s missing is a brain. Videos after the break.

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