A zoetrope is a charming piece of Victoriana, a device that gives the sensation of a moving image by exposing its successive frames through slits in a rotating drum. [Brian Corteil] however is not content with a mere 19th century parlour amusement, he’s connected twelve OLED displays to a Raspberry Pi and mounted them on a circular platform with a rotary encoder to make a fully digital zoetrope.
Connecting 12 SPI devices to the Pi was always going to be something of a challenge, because only two CS lines are provided. [Brian] has a rather elegant solution to this problem, he’s daisy-chained his displays to form a shift register in which each image is passed to the next display on a rotational increment.
His resulting zoetrope sits on a laser-cut frame which rotates over an encoder disc which looks to be made from printed paper. It is still something of a work in progress, but he has plans to record video on the Pi camera for immediate playback on his creation. You can take a look at his code for the zoetrope on GitHub.
This isn’t the first zoetrope we’ve covered here at Hackaday, or even the first digital one. We’ve seen a couple of 3d-printed ones, and one featuring laser-cut images captured with a Kinect. But it’s a good piece of work, and has the promise of more to come if his camera plans come to fruition. Continue reading “Digital Zoetrope Powered By Pi”
Spirals, fractals, and even bone length proportions whisper of a consistent ratio woven into the universe. Math is hidden in the fabric of things, and when this fact is observed in art, magic happens. Professor, artist, and inventor [John Edmark] draws inspiration from geometric patterns found in nature and builds sculptures using the golden ratio as a standard for design. In this project, he expresses these characteristics through animated biomorphic zoetropes.
[John] modeled several 3D sculptures in Rhino containing similar geometric properties to those found in pinecones and palm tree fronds. As the segments grow from those objects in nature, they do so in approximately 137.5 degree intervals. This spacing produces a particular spiral appearance which [John] was aiming to recreate. To do so, he used a Python script which calculated a web of quads stretched over the surface of a sphere. From each of the divisions, stalk-like protrusions extend from the top center outward. Once these figures were 3D printed, they were mounted one at a time to the center of a spinning base and set to rotate at 550 RPM. A camera then films the shape as it’s in motion at a 1/2000 sec frame rate which captures stills of the object in just the right set of positions to produce the illusion that the tendrils are blooming from the top and pouring down the sides. The same effect could also be achieved with a strobe light instead of a camera.
[John] has more information on his instructables page. He also provides a video of this trick working with an actual artichoke; one of the living examples of the golden ratio which this project was inspired by. Thank you, [Charlie Nordstrom] for helping him document these awesome sculptures and for telling us about them!
Continue reading “Animate Your Artichoke with a Lathe and Camera”
[Sholto] hacked together this ultra low-budget spinning display. He calls it a zoetrope, but we think it’s actually an LED based Persistence Of Vision (POV) affair. We’ve seen plenty of POV devices in the past, but this one proves that a hack doesn’t have to be expensive or pretty to work!
The major parts of the POV display were things that [Sholto] had lying around. A couple of candy tins, a simple brushed hobby motor, an Arduino Pro Mini, 7 green LEDs, and an old hall effect sensor were all that were required. Fancy displays might use commercial slip rings to transfer power, but [Sholto] made it work on the cheap!
The two tins provide a base for the display and the negative supply for the Arduino. The tins are soldered together and insulated from the motor, which is hot glued into the lower tin. A paper clip contacts the inside of the lid, making the entire assembly a slip ring for the negative side of the Arduino’s power supply. Some copper braid rubbing on the motor’s metal case forms the positive side.
[Sholto] chose his resistors to slightly overdrive his green LEDs. This makes the display appear brighter in POV use. During normal operation, the LEDs won’t be driven long enough to cause damage. If the software locks up with LEDs on though, all bets are off!
[Sholto] includes software for a pretty darn cool looking “saw wave” demo, and a simple numeric display. With a bit more work this could make a pretty cool POV clock, at least for as long as the motor brushes hold up!
Continue reading “POV Display Does it on the Cheap”
Looking for a clever way to build a Phenakistoscope? Maybe you’re more familiar with its other names; Fantoscope, Phantasmascope, or perhaps its close cousin the Zoetrope?
If you’re still scratching your head, that’s okay — they have really weird names. What we’re referring to here is a type of optical illusion that mimics movement by showing a series of still images at an offset interval — this can be achieved by looking through slots, strobing a light (like in this case) or even by the use of mirrors.
This particular Phenakistoscope is a very simple but clever design that makes use of a recycled stepper motor from a printer, a CD as the animation disk, a strip of LED lighting, a few potentiometers and an Arduino to control the strobe. It works by synchronizing the strobe frequency with the motor rotation, resulting in the image in motion effect.
Stick around after the break for a full gallery of the build and a demonstration video.
Continue reading “Electronic Phenakistoscope!”
[Jasper] sent in a project he, [Quinten], and [Mr. Stock] have been working on for a while. It’s called the Pristitrope and brings the classic 19th centrury paper-based animation device into the 21st century with 18 LCD displays.
The lazy suzan portion of the build was fabricated out of plywood cut on a CNC router and fastened together with the help of a slip ring to transfer power between the stationary and spinning portions of the device. For the electronic part of the build, eighteen LCD displays were connected together on a data bus with each display independently addressable by a microcontroller.
One really interesting feature of the Pristitrope is its ability to detect if it is currently rotating clockwise or counterclockwise. While [Quinten]’s video doesn’t show off the full possibilities of this feature, the spin sensor makes it possible to always have an animation played in the right direction regardless of how the Pristitrope is spun.
Continue reading “Digital zoetrope uses 18 LCD displays”
Normally, 29 men walking around in an endless circle would be the stuff of an [M.C. Escher] engraving. [Tobias] turned this into a reality with a little help from some LEDs and a 3D printer.
Like his earlier project, [Tobias] built himself a nice little strobing zoetrope that maintains the illusion of movement by flashing LEDs at precise intervals. Instead of a flat 2D image, [Tobias] went for a walking 3D figure that marches to the beat of a timer circuit. The figures themselves were printed via Shapeways.
The electronics were improved for this iteration. Formerly, [Tobias] used a 555 and a whole bunch of auxiliary components. The circuit was improved for this version to uses Schmitt triggers and an optical encoder. The easy-to-build-on-perfboard schematics and layouts are available, so feel free to build one for yourself.
[Tobias]’ zoetrope isn’t much different from the gigantic Charon sculpture seen at last year’s Burning Man. Sure, it’s not 40 feet tall but it’s still a nice piece of work.
Continue reading “3D printed zoetrope”
A zoetrope is a device that contains a disk full with a series of images that make up and animation. A couple of different methods can be used to trick the eye into seeing a single animated image. In the past this was done by placing the images inside of a cylinder with slits at regular distances. When spun quickly, the slits appear to be stationary, with the images creating the animation. But the same effect can be accomplished using a strobe light.
The disk you see above uses the strobe method, but it’s design and construction is what caught our eye. The animated shapes were captured with a Kinect and isolated using Processing. [Greg Borenstein] takes a depth movie recorded while someone danced in front of a Kinect. He ran it through a Processing sketch and was able to isolate a set of slides that where then turned into the objects seen above using a laser cutter.
You can watch a video of this particular zoetrope after the break. But we’ve also embedded the Pixal 3D zoetrope clip which, although unrelated to this hack, is extremely interesting. Don’t have a laser cutter to try this out yourself? You could always build a zoetrope that uses a printed disk.
Continue reading “Building a zoetrope using Kinect, processing, and a laser cutter”