Denim Sunglasses Frames Use A Wicked Set Of Jigs

An obligatory “Future’s so bright I gotta wear… denim” joke is the only way to kick off this article. Sorry!

Now that that’s out of the way, how would you turn your own blue jeans into sunglasses? Well you wouldn’t, unless you’ve built an intricate jig for assembling sunglasses frames like [Mosevic] has done. Boiled down, this is like making parts out of carbon fiber, except you swap in denim for the carbon fiber. Several layers of blue jean material are layered in a mold and impregnated with resin. Once hardened, parts can be milled or laser cut from this stock and then assembled into the frames all of the hipsters are after.

For us its the assembly jig that’s so interesting to see. [Mosevic] shared it in an unlisted video of an update to the Kickstarter campaign which ran at the end of 2019. The jig is used to align machined parts into stack ups that include brass reinforcement and pins to align layers, as well as the joining for the three parts of the frame via the metal hinges. Most of the jig is made from machined plywood. The plates that hold the three parts of the frame, the “frame front” and the two “temples” in eyeglass parlance, are interchangeable so that the same jig can be used to assemble several variants of the frame design. The most notable non-plywood part of the jig are two metal clamps that hold the hinge into the frame front as the glue dries, holding a couple of tiny chunks of denim/resin block in place.

Here you can see the jig with all clamps fully closed. There is not an insignificant amount of time just getting the parts into this jig. But parts still need quite a bit of cleanup after this process to sand, shape, and polish all edges and surfaces of the frames. And of course you have to figure in the time it took to make the parts that went into the jig in the first place. The finished frames are gorgeous, but we have a lot more respect having seen what it takes to pull it off.

Now if you like your glasses like George Washington liked his false teeth, here’s how you can pull a set of shades out of your woodshop.

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A Reminder Not To Touch Your Face

In 2020, the world is focused on the rampant spread of a new virus by the name of COVID-19. Like many infectious diseases, transmission can be reduced by good hygiene practices. To help in the fight, [Nick Bild] threw together a device he calls Sentinel.

The concept is simple. Reduce the user touching their own face by shining a warning light when such behaviour is detected. This is achieved through the use of an Arduino, which controls an LED through feedback from an ultrasonic proximity sensor. The LED is placed in the user’s peripheral vision, glowing when the sensor detects hands (or other objects) approaching the face.

While it’s unlikely to be rolled out en-masse, it’s a project that nevertheless reminds us to practice good self-care routines. And, as the adage goes, prevention is better than cure. As governments and industry grapple with the ongoing problem, consider how your supply chain may be exposed to the crisis. Video after the break.

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Bone Conducting Headphones Built Into Eye Glasses

There are times when being seen to listen to music through headphones might get you into trouble. For these moments, reach for a handy solution: bone conduction speakers that discreetly pipe the music to your eardrums through the bone of your skull. [Samuel] wanted just such a covert music listening device, so created his own in a set of 3D-printed glasses.

He first tried using an Adafruit bone-conducting transducer but found that to be too bulky. What you see here is a smaller module that [Samuel] found on AliExpress (search for bone conduction module). The GD-02 is much smaller and thus more suitable for hiding in the arm of a pair of glasses. For the rest of the electronics he used a PCB and battery from a donated set of broken Bluetooth headphones, a space for which he was able to conceal easily in the 3D-printed frame of the glasses. The battery is in one arm and the board in the other, and he says the wiring was extremely fiddly.

The result is a surprisingly svelte set of specs that you might not immediately think concealed some electronics. His choice of bright yellow filament might give the game away, but overall he’s done a great job. This certainly isn’t the first bone conduction project we’ve shown you, some of the others have used motors instead of bone conduction transducers.

Glasses Frames Crafted Out Of Wood

Most glasses and sunglasses on the market make use of metal or plastic frames. It’s relatively easy to create all manner of interesting frame geometries, tolerances can be easily controlled for fitting optical elements, and they’re robust materials that can withstand daily use. Wood falls short on all of these measures, but that doesn’t mean you can’t use it to make a beautiful pair of glasses.

ZYLO is a company making wooden eyewear, and this video from [Paide] shows the build process in detail. Modern tools are used to make things as efficient as possible. Parts are lasercut and engraved to form the main part of the frames as well as the temples (the arms that sit over the ears to hold them on your face). A special jig is used to impart a curve on the laminated wood parts before further assembly is undertaken. Metal pre-fabricated hinges and screws are used to bolt everything together like most other modern sunglasses, but there’s significant hand finishing involved, including delicate inlays and highlighting logo features.

In contrast, Manuel Arroyave works very differently in the creation of his Cedoro glasses. Sheets are first laminated together, before the shape is roughed out by a special horizontal axis milling setup. Even small details like the hinges are delicately hand-crafted out of wood and fitted with tiny wooden dowels.

It goes to show that there’s always more than one way to get a job done. We’re tempted to break out the laser cutter and get started on some custom shades ourselves. Perhaps though, you’re too tired to put your sunglasses on by yourself? Nevermind, there’s a solution for that, too. Video after the break.

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Voice Controlled Glasses And Magnifying Lens

If you’re reading Hackaday, you’re probably intimately familiar with really small parts. 0201 resistors are tiny, and even smaller parts aren’t unheard of. The screws that go in your phone are minuscule, and a magnifying glass is really handy if you want to check out the detail on your 3D prints. While this is easy if you have good eyesight and you’re young, a lot of us don’t have that luxury and instead must rely on magnifying glasses and loupes. [Mauro]’s project for the Hackaday Prize makes wearing these loupes and lenses even easier by adding a voice-controlled servo.

The basic idea behind this device is simple — just mount a standard hobby servo to a pair of glasses and put a pair of loupes on a hinge. With a Raspberry Pi Zero W, controlling this servo is easy. The real trick here is adding voice control, and for that [Mauro] is using the Watson Speech to Text service. Moving a pair of loupes away from your eyes is as simple as setting up an account with the Watson Speech to Text service, and sending out API calls using NodeJS.

In addition to magnifying glasses, [Mauro] also has a few other ideas in mind on how to make this device even more useful. It could be used for welding goggles, for removing sunglasses as you’re driving through a tunnel, or it could even be adapted as an improved version of those crazy straws that suck liquid around the rim of plastic glasses. The potential here is almost limitless, and this is one of the better projects in this year’s Hackaday Prize.

You can see a video of these glasses in action (without the voice activation) after the break.

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Automatic Sunglasses For The Lazy Hacker

[Andreas] may have created the ultimate lazy hacker accessory: automatic sunglasses, or “Selfblending sunglasses” as he creatively titled his video. If you can’t tell from the name, these are glasses that you never have to take off. If the light is dim, they move away from your eyes. Going back outside to bright light? The glasses move to protect your eyes.

The glasses consist of a couple of micro servos which move tinted lenses toward or away from the user’s eyes. A side-mounted Arduino Uno reads a CdS cell light sensor and drives the servos.  Why an Uno rather than a much more wearable Arduino Nano? It’s what [Andreas] had lying around.

Yes, a good portion of the fun of this build is [Andreas’] comedy. But the best part comes when he tests the glasses out — in an actual car on the highway. The glasses work better than expected — moving the lenses into and out of [Andreas] field of view as he drives through tunnels. You can actually see how surprised [Andreas] is that it works so well.

These aren’t the first automatic sunglasses we’ve seen, nor are they the most peril-sensitive. Still, it’s a fun project and the video gave us a few chuckles.

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Low-Cost Eye Tracking With Webcams And Open-Source Software

“What are you looking at?” Said the wrong way, those can be fighting words. But in fields as diverse as psychological research and user experience testing, knowing what people are looking at in real-time can be invaluable. Eye-tracking software does this, but generally at a cost that keeps it out of the hands of the home gamer.

Or it used to. With hacked $20 webcams, this open source eye tracker will let you watch how someone is processing what they see. But [John Evans]’ Hackaday Prize entry is more than that. Most of the detail is in the video below, a good chunk of which [John] uses to extol the virtues of the camera he uses for his eye tracker, a Logitech C270. And rightly so — the cheap and easily sourced camera has remarkable macro capabilities right out of the box, a key feature for a camera that’s going to be trained on an eyeball a few millimeters away. Still, [John] provides STL files for mounts that snap to the torn-down camera PCB, in case other focal lengths are needed.

The meat of the project is his Jevons Camera Viewer, an app he wrote to control and view two cameras at once. Originally for a pick and place, the software can be used to coordinate the views of two goggle-mounted cameras, one looking out and one focused on the user’s eye. Reflections from the camera LED are picked up and used to judge the angle of the eye, with an overlay applied to the other camera’s view to show where the user is looking. It seems quite accurate, and plenty fast to boot.

We think this is a great project, like so many others in the first round of the 2018 Hackaday Prize. Can you think of an awesome project based on eye tracking? Here’s your chance to get going on the cheap.

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