As exciting as Eclipse 2017 is going to be this Monday, for some folks it might appear a bit — underwhelming. Our star only occupies about half a degree of the sky, and looking at the partial phase with eclipse glasses might leave you yearning for a bigger image. If that’s you, you’ll need to build a sun funnel for super-sized eclipse fun.
[Grady] at Practical Engineering is not going to be lucky enough to be within the path of totality, but he is going to be watching the eclipse with a bunch of school kids. Rather than just outfitting his telescope with a filter and having the kids queue up for a quick peek, he built what amounts to a projection screen for the telescope’s eyepiece. It’s just a long funnel, and while [Grady] chose aluminum and rivets, almost any light, stiff material will do. He provides a formula for figuring out how long the funnel needs to be for your scope, along with plans for laying out the funnel. We have to take exception with his choice of screen material — it seems like the texture of the translucent shower curtain might interfere with the image a bit. But still, the results look pretty good in the video below.
Eclipse 2017 is almost here! How are you planning to enjoy this celestial alignment? By proving Einstein right? By studying radio propagation changes? Or just by wearing a box on your head? Sound off in the comments.
Continue reading “Embiggen your Eclipse 2017 Experience with a Sun Funnel”
It’s hard to beat a vintage clock for something that you can hack, and that your significant other might actually let you display in your home. It’s practical and it’s art all at the same time! But, finding that perfect vintage clock for restoration can be a bit tricky. A crowd favorite is to choose something with intricate mechanisms and gears — the motion of a mechanical display is just so fascinating.
[Gavin] managed to find a clock that is every bit as interesting without any moving parts. The clock uses a unique system of bulbs and screen masks to project each digit of the time onto glass, which creates a pretty cool look you’re not likely to see on other devices. As cheap as LCD and 7-segment displays are these days, it’s hard to imagine a time when an intricate solution like this — using 72 light bulbs — was considered practical.
Of course, what isn’t practical is replacing 72 incandescent bulbs, just to have them start the process of burning out all over again. [Gavin’s] solution to this problem was to replace the incandescent bulbs with LEDs. After getting the color temperature right (to replicate the vintage warm glow), he was able to use a jig system to get the LEDs positioned correctly to project the digits properly.
This certainly isn’t the first time we’ve seen a unique clock design, but there is something intriguing about seeing a design like this that never quite caught on. It’s a little bit of technological history that even your significant other will think is cool.
A DLP 3D printer works by shining light into a vat of photosensitive polymer using a Digital Light Processing projector, curing a thin layer of the goo until a solid part has been built up. Generally, the resolution of the print is determined by the resolution of the projector, and by the composition of the polymer itself. But, a technique posted by Autodesk for their Ember DLP 3D Printer could allow you to essentially anti-alias your print, further increasing the effective resolution.
Continue reading “Get Subpixel Printing With a DLP 3D Printer”
Mirror galvanometers were originally developed in the 17th century to precisely measure very small changes in current. Unlike other instruments of the day, a mirror galvanometer could clearly show minute current variations by translating tiny movements of the mirror into large movements of the light reflected off of the mirror. Before clean electrical amplification became possible, this was the best means of measuring tiny differences in current. True mirror galvanometers are very sensitive instruments, but hobby servos can be used as a low-fidelity alternative, like with this project on Hackaday.io created by [robives].
Using a mirror galvanometer is by far the most common technique for laser projection shows – it’s really the only way to move the laser’s beam quickly enough to create the visual illusion of a solid line in real time. A mirror galvanometer works by using coils to attract magnets attached to the mirror, allowing the angle of the mirror to change when current is applied to the coils. This movement is extremely small, but is amplified by the distance to the projection surface, meaning the laser’s beam can move huge distances in an instance. If you’ve ever seen a laser show, it almost certainly used this technique. But driving galvos requires a beefy DAC, so we can’t blame [robives] for wanting to keep it digital.
[robives’s] project side-steps the need for galvanometers by using glow-in-the-dark vinyl and a UV laser. The result is a laser beam trail which lasts much longer, which means that solid lines are visible without the need for high-speed galvos. A build like this lets you experiment with laser projections without dealing with sensitive mirror galvos, and instead use components that you probably already have sitting on your workbench.
Continue reading “UV Laser Projector Shines With Glow-in-the-Dark Vinyl”
Do you know how a film projector works? We thought we did, but [Bill Hammack] made us think twice. We have covered the Engineer Guy’s incredibly informative videos many times in the past, and for good reason. He not only has a knack for clear explanation, the dulcet tones of his delivery are hypnotically soothing. In [Bill]’s latest video, he tears down a 1979 Bell & Howell 16mm projector to probe its inner workings.
Movies operate on the persistence of vision (POV) principle, which basically states that the human brain creates the illusion of motion from still images. If you’ve ever drawn circles and figure eights in the nighttime air with a sparkler or perused a flip book, then you’ve experimented with POV.
A film projector is no different in theory. Still images on a strip of celluloid are passed between a lamp and a lens, which project the images on to a screen. A device called a shuttle advances the film by engaging its teeth into the holes on the edge of the film and moving downward, pulling the film with it. The shuttle then disengages its teeth and moves up and forward, starting the process again.
Film is projected at a rate of 24 frames per second, which is sufficient to create the POV illusion. A projector’s shutter inserts itself between the lamp and the lens, blocking the light to prevent projection of the film’s physical movement. But these short periods of darkness, or flicker, present a problem. Originally, shutters were made in the shape of a semi-circle, so they block the light half of the time. Someone figured out that increasing the flicker rate to 60-70 times per second would have the effect of constant brightness. And so the modern shutter has three blades: one blocks projection of the film’s movement, and the other two simply increase flicker.
[Bill] explains how the projector reads the optical soundtrack. He also delves into the mechanisms that allow continuous sound playback alongside intermittent projection of the image frames. You’ll never look at a projector the same way again.
Want to know more about optical soundtracks? Check out this Retrotechtacular that explores the subject in detail.
Continue reading “Shedding Light on the Mechanics of Film Projection”
Week 17 of the Caption Cern Contest on Hackaday.io is now a polished sheet metal memory, but the captions live on! Thanks to everyone who entered. We may never know exactly what these scientists and their ladder holding friend were up to. We do know a bit more about some of the equipment in that photo though! Astute reader [Pierlu] dropped a photo comment here on the Blog showing some interesting lawn ornaments over at CERN. The device to the right looks quite a bit like the device on the right side of our original image. We don’t have a close-up to be sure, but chances are this is part of a Cockcroft–Walton generator.
- “…and six cute little kittens, too. I wonder how she got in here? Hey, hold that ladder steady, Schrödinger!” – [sbi.gaijin]
- “Good news: the shrink ray worked. Bad news: we have to escape the janitor’s vacuum cleaner” – [Cody]
- “Archeology Professor Ammit Duat from the University of Cairo, assisting CERN engineer Jack Orsiris in changing the locks on the door to the Egyptian underworld” – [carbonfiber]
This week’s winner is [alj5432] with “Sticking with CERN’s usual “Go Big or Go Home” theme,
scientists make adjustments to LHC’s massive “Press To Start” Button.” We’re sure [alj5432] will enjoy probing digital circuits with his new Logic Pirate From The Hackaday Store! Congratulations [alj5432]!
CERN is no stranger to innovative display systems. That should be no surprise, considering CERN staff are trying to work with massive amounts of data collected by thousands of scientists. Here we see one of those systems, a projection table of some sort.
Today video projectors are relatively cheap and easy to make, thanks to advances in LCD and MEMS technology. Back when this image was shot in 1979 though, video projectors were expensive and rare commodities. What was this scientist doing?
You tell us!
Once again, we’re giving away a Logic Pirate from The Hackaday Store.
Add your humorous caption as a comment to this project log. Make sure you’re commenting on the contest log, not on the contest itself.
As always, if you actually have information about the image or the people in it, let CERN know on the original image discussion page.
Navigating with your phone can be a hassle: the phone displays a tiny map that you’re never supposed to look at while driving, but of course you do. [Mikeasaurus] has the ultimate solution: Direction Projection! Mike has created an augmented reality system with no glass heads-up display, and no goggles ala Microsoft Hololens. The road ahead is his canvas. A standard projector mounted atop his car displays maps and turn indicators, all from his phone. Linking the phone and projection system would normally involve HDMI or analog video cables strung through the roof. [Mikeasaurus] simplifies that by using a Chromecast, which allows him to stream his phone’s screen over WiFi.
The projector itself is the HD25-LV, a 3500 Lumen model from Optima. the HD25-LV is capable of 1080p, though in this situation, brightness is much more important than resolution. [Mikeasaurus] mounted the projector along with a gel cell battery and 900 watt DC to AC inverter to power it. A mobile WiFi hotspot fills out the rooftop kit. Leaving an expensive setup like that on top of a car is a recipe for disaster – be it from rain, rocks, or theft. [Mikeasaurus] thought ahead and strapped his setup down inside a roof mounted cargo box. A plastic covered hole in the front of the box allows the projector to shoot down on the road while protecting its lens. We’d want to add a vent and fan to ensure that projector gets a bit of airflow as well.
On the road, the system actually works. Understandably, it’s not going to work very well during the day, but at night the system really shines! Just don’t tailgate – you wouldn’t want the driver in front of you to know exactly where you’re going, would you?
Continue reading “Direction Projection is a beacon in the night”