I Built Myself a 16×20-Inch Camera in 10 Hours

[Giles Clement] was avoiding work in a bar, nursing a pint, and doodling a sketch for a camera. He looked at his sketch, thought, “gee, that looks better than answering emails,” and called his friend. An hour later they were at home depot buying supplies, and ten hours of furious work later, they had a camera. Nothing gets a project done like avoiding work! (See it all happen before your eyes in the video below the break.)

The camera is built around a 500mm f/4.5 Goerz Dogmar lens from around 1918 and was apparently used for aerial recon out of blimps. The frame of the camera is pine and plywood. [Giles] had heard that building the bellows for these cameras had taken other hobbyists months and thousands of dollars. Rather than elaborately folded fabric, he supported his 6 mil plastic bellows on telescoping rigid rods. To view the image while he’s focusing it, he sanded a plate of glass with 100 grit sandpaper to serve as a view screen.

Once the camera was completed, they prepared the plates and exposed photos. The first step, from what we could tell, was to disregard all chemical safety practices. The second step was pouring a substance called collodion on an unsanded glass plate and tilting the plate back and forth until the whole plate had an even coat on it. Then it was put in a bath of silver nitrate to sensitize. Once sensitized the plate was placed in the frame of the focused camera and an astonishing amount of strobe light emitted. After that it’s back to the chemical baths for more safety hazards. The whole process has to be done under fifteen minutes or the plate cures before it can be used. The photos that come out are seriously cool. It’s no wonder these old styles of photography have seen a comeback.

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Sub $300 CNC, If You Have a 3d Printer

[Allted] has designed a CNC machine that you can print yourself; adding conduit, bearings, and the standard vitamins to bring it to life. The CNC machine uses a mechanical design similar to an etch-a-sketch, though instead of the maze of pulleys and cable it uses four stepper motors to do the X and Y translation. The machine looks to be about as accurate as a Shapeoko, and is able to handle light cutting in aluminum.

The coolest part is the extensibility of the printer. For example, [Allted] needed to print a lot of parts to make orders of the kit. So, he built a 4 headed 3D printer by copying blocks of the design, and tying them all to the same belt. The design also seems to be a little more resistant to dust and debris than some homemade rigs. The CNC won the Boca Bearings design competition. If you’d like to build one yourself, [Allted] has all the instructions with print setting recommendations on his website.

Bismuth Crystals Hold Magnet Suspended for 100 Years

[NightHawkInLight] has been playing around with the diamagnetic properties of bismuth. Diamagnetic materials get a lot of attention due to their strange ability to produce the opposite of the magnetic field going through them. In simpler terms, metals like iron are attracted to magnets; metals like bismuth repel them.

[NightHawkInLight] built his own interpretation of a common lab example used to demonstrate this remarkable property, a levitator. A levitator is made by sandwiching a magnet between two plates of diamagnetic material. One of the plates is given a magnetic field opposite of the magnet underneath it by a stronger magnet placed some distance away. When this is done, the magnet in between wants to repel away from the plate above, only to find that as it gets closer to the plate below it is equally repelled, creating a stable system.

Eventually the magnet above will need realignment, but [NightHawkInLight] assures us this is only once every 100 years. Video after the break. Continue reading “Bismuth Crystals Hold Magnet Suspended for 100 Years”

Lego Technic of the Past Eliminates Apple ][ with Arduino and Touchscreen

[JAC_101], the Director of Legal Evil Emeritus for LVL1 Hackerspace (don’t ask me, it’s their title system), was challenged to a hacking duel. It all started years ago. The person who is now president of LVL1, visited the space for the first time and brought with her a discarded Apple II controller for Lego bricks which had previously belonged to her father. Excited to test it, the space found that, unfortunately, LVL1’s Apple II wouldn’t boot. An argument ensued, probably some trash talking, and [JAC_101] left with the challenge: Could he build an Arduino interface for the Apple II Lego controller quicker than the hackerspace could fix its Apple II?”

Other things that belonged to people's fathers.
Other things that belonged to people’s fathers.

In the end, a concentrated force by one hacker over two years overcame the collective ADHD of many. He began by opening the interface to look inside, a completely unnecessary step since he found it was already thoroughly documented. Next he forgot about the project for a year. Then he remembered it, and built an interface for an Arduino Uno to hook to the controller and wrote a library for the interface. Realizing that sending serial commands was not in line with the original friendly intention of the device, he added a graphical display to the project; which allowed the user to control the panel with touch. In the end he won the challenge and LVL1 still doesn’t have a working Apple II. We assume some gloating occurred. Some videos of it in action after the break.

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Test Drive Your New Programming Font

After hour and hours spent in front of a terminal or IDE, a user begins to build a list of infuriating little things. That one pop-up box that happens every time you press that button by mistake. The noise the software makes when the compile fails. Or the horrible reality that your code just crashed because there wasn’t enough difference between uppercase ‘O’ and a zero. In comes the programming font.

The typical way to find a programming font is to troll forums for a user with a similar problem and see if they have a workable solution. [Koen Lageveen] went out and found nearly all of the free programming fonts out there and compiled a list. He then took one more step and wrote a web app that lets you test them out. Hopefully this will help those in the very real struggle for the perfect programming font. You can try out the tool for yourself, and if you really like it [Koen] has all the code up for it on his GitHub.

[via Hacker News]

Web Connected Breathalyser with Phone Display

[spillsman] is working on a IoT startup and wanted to work and play while he tested their hardware. His company, WifiThing, is bundling the Texas Instruments toolchain and mesh networking with a sort of plug-and-play web interface. The board uses a MSP430 and two other TI Networking chips to make setting up, logging data, and controlling outputs simpler. The web interface looks interesting, but in our experience this sort of approach only saves time up to a point. Then it’s time to pull out the chip’s various bibles, ‘nomicons, spell manuals, and supporting religious documents to get the thing to work.

Though, there are some projects where you would like a simple way to log data from multiple sensors, if this can do that easily (and more importantly, cheaply) it might be very cool. We are interested to see if the open source software is easy to integrate without buying their hardware. Either way, after setting up a simple circuit to heat the coil in the breathalyzer, and translate the data into a signal usable for the chip, [spillsman] was able to record alcohol levels and even keep a, perhaps unwise to record, high-score from his phone.

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A Digital Canvas That’s Hard to Spot

While sorely lacking in pictures of the innards of this digital canvas, we were extremely impressed with the work that went into making such a convincing object. [Clay Bavor] wanted a digital picture frame, but couldn’t find one on the market that did what he wanted. They all had similar problems, the LCDs were the lowest quality, they were in cheap bezels, they had weird features, they had no viewing angle, and they either glowed like the sun or were invisible in dark environments.

[Clay] started with the LCD quality, he looked at LCD specs for the absolute best display, and then, presumably, realized he lived in a world where money is no object and bought a 27″ iMac. The iMac has a very high pixel density, no viewing angle, and Apple goes through the trouble of color balancing every display. Next he got a real frame for the iMac, cut a hole in the wall to accommodate it, and also had a mat installed to crop the display to a more convincing aspect ratio for art. One of the most interesting part of the build is the addition of a Phidgets light sensor. Using this, he has some software running that constantly adjusts the Mac to run at a brightness that’s nearly imperceptible in the room’s lighting.

Once he had it built he started to play around with the software he wrote for the frame. Since he wanted the frame to look like a real art print he couldn’t have the image change while people were looking, so he used the camera on the Mac and face detection to make sure the image only changed when no one was looking for a few minutes. He also has a mode that trolls the user by changing the image as soon as they look away.

We admit that a hackier version of this would be tearing the panel out of a broken iMac and using a lighter weight computer to run all the display stuff. [Clay] reached the same conclusion and plans to do something similar for his version 2.0.

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