Animated engraving

It’s been seven years since Janala did his first job with engraving and highlighting acrylic (Jani Ponkko), nicknamed Japala. . Then it was a simple mouse pad. Many new things have been discovered in modding over the years. The technique has become more perfect, and modders have accumulated a lot of experience. But as then, today one sheet of acrylic for engraving is most often used. But you can work with several. This may open up new possibilities: multi-colored lights, a believable image of 3D models, or even the creation of animation. Jani Ponkko will show what can be done with several layers of acrylic, Dremel and LEDs.
As the name suggests, The technology of multilayer design consists of two or more layers of acrylic. Each layer can have its own pattern and color. The result will be impressive.
For the first time, Japala spoke about the multi-layered image using acrylic engraving back in 2002. Then he made a trial project - the silhouette of an anime-style girl with a flashing red ball.The girl herself was engraved on one layer, the ball was on the other.
First you need to understand the very principle of highlighting engraving on acrylic. Engraving - a series of thin grooves in acrylic. To make them more visible, they are highlighted. For this purpose, high-intensity LEDs are usually used. The place of engraving is scattered by light, and it reaches the viewer. In multi-layer animation, one layer is highlighted first, then the second, third, and so on. The result is similar to animated neon signs.
Japala makes an engraving on the back of an acrylic sheet. It improves the dispersion of light and makes the picture brighter. Only it is necessary to remember that the image must be done in a mirror image. The modder himself admits that he sometimes forgets this simple truth. This is not so important with an arbitrary picture, but text sheets can be thrown away.
For the animated image, Jani chose the Intel logo. For good reason. This is the first design consisting of three elements that came to his head.In addition, the images on different layers do not overlap each other, which facilitates the task for the first time.
After a small session with the Dremel, all three layers were ready . In the photographs, acrylic sheets seem a bit dull. No need to worry, just a protective film has not yet been removed.
The LEDs used are 5 mm thick. At the same time, the thickness of acrylic sheets is only 3 mm. So I had to work a little on them. Now they have become shorter and more compact, which slightly simplified their installation. But if 3-mm LEDs are available in the store, then it’s better to buy them right away.
Then Japala made a pair of LED + resistor. Epoxy glue can damage acrylic, so ordinary glue was used.
For the page with the word“ Intel ”one LED was used, as for the layer“ Inside ". But to highlight the image of the oval made two LEDs located on opposite sides.
The edges of acrylic sheets opposite to the LEDs were wrapped in aluminum tape.It has a mirror effect, so a beam of light will be reflected until it comes out through the engraving line. In addition, this will create light insulation between the layers.
Japala used Attiny's ATtiny4 chip. It includes several LEDs in turn. But this thing modder applied only for verification. It was decided to create its own scheme.
Previously, the enthusiast used the diagram shown on the left to organize the sequential switching on of LEDs. The switching speed of the LEDs is controlled by the 555 microcircuit. Moreover, if you replace the 47 kΩ resistor with a potentiometer, you can manually change the switching frequency. &Nbsp;
stillusetherightschema.Basicallyitisalmostthesame,buttheoutputsareadditionallyconnectedtoanNPNtypebipolartransistor.ThisallowsyoutocontrolalargenumberofLEDs.Notethatthebluewiregoesfromoutput7to15.Connector15inthiscircuitisresetting,andwhenitreceivesasignal,itsuppliespowertothefirstLED.Youcanvarythenumberof 
layerstobehighlighted.Ifyoumovethebluewiretooutputnumber10,andconnectanotherLEDto7,youwillhave4layers.
Thisschemewasoriginallydesignedforotherpurposes-adjustingthethree-colorbacklight.Buttheprogrammaticchangeinpulse-widthmodulationmadeitpossibletoquicklypreparethedeviceforcurrenttasks.Thechipcontainsa8MHzresonatorandthreeseparatechannels.Theregulatorcontrolsthespeedofswitching.Youcouldusethealternateinclusionschemeforeachlayer.ButJanididnotgotheeasyway.Hedidsothatattheendallthreelayerslightupforamomentandsimultaneouslygoout.

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