A Lenticular Clock Spells Out The Hours

So many are the clock projects which cross the Hackaday threshold, that it’s very rare indeed to see something that hasn’t already been done. We think we’ve not seen a lenticular clock before though, and we’re thus impressed by this one produced by [Moritz Sivers].

You may well be familiar with lenticular images from toys and novelties, an animation is sliced into lines and placed behind an array of multi-faceted linear lenses. It gives the effect of movement as from different viewing angles a different frame of the animation is perceived. In this clock the animation is replaced by the clock digits, and by rotating the whole with a servo driven by an ESP8266 microcontroller it can display different digits to the viewer. The write-up and the video below are of value both for the clock itself and the description of how these animations are produced. The clock itself doesn’t sacrifice usability for all its novelty, and we can see this technique might find a place in other projects requiring custom displays.

The lenticular lenses used here are off the shelf, but if you are of an adventurous mind, you could try printing some of your own.

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A 3D-printed puzzle for the visually impaired. The pieces have both a texture and a slant.

A Puzzle For The Visually Impaired, Or Blindfolded

There’s no reason why a visually impaired person can’t enjoy putting together a jigsaw puzzle. It just needs to look a little different. Or, in this case, feel different.

16-year-old [feazellecw] has come up with just the solution — a puzzle with pieces that have both a defining texture and a slant in the z-height to them. While there is no picture on the puzzle face to speak of, instead there is a satisfying end result. You could change it up and add a relief image if you wanted, as long as you still observed the diagonal lines, the z-slant, and the little hole in the bottom that helps differentiate it from the top.

As [feazellecw] says, it’s important to find a box to help keep the pieces together during assembly; a 3D-printed box would be a nice touch. Files for this 15-piece puzzle are available if you’d like to make one for yourself or someone else, but just the idea might inspire you to make your own variant.

Don’t like putting puzzles together? Build a robot to do it for you.

FLOSS Weekly Episode 793: Keeping An Eye On Things With Hilight.io

This week Jonathan Bennett and Aaron Newcomb chat with Jay Khatri, the co-founder of Highlight.io. That’s a web application monitoring tool that can help you troubleshoot performance problems, find bugs, and improve experiences for anything that runs in a browser or browser-like environment. Why did they opt to make this tool Open Source? What’s the funding model? And what’s the surprising challenge we tried to help Jay solve, live on the show? Listen to find out!

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Supercon 2023: Jesse T. Gonzalez Makes Circuit Boards That Breathe And Bend

Most robots are built out of solid materials like metal and plastic, giving them rigid structures that are easy to work with and understand. But you can open up much wider possibilities if you explore alternative materials and construction methods. As it turns out, that’s precisely what [Jesse T. Gonzalez] specializes in.

Jesse is a PhD candidate at Carnegie Mellon’s Human-Computer Interaction Institute, and an innovator to boot. His talk at the 2023 Hackaday Supercon covers his recent work on making circuit boards that can breathe and bend. You might not even call them robots, but his creations are absolutely robotic.

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Exploring Soap Films

While fluid dynamics sounds like a dull topic, SoapFilmScope promises to make it fun by using your cell phone to observe the interactions between sound waves and liquid membranes. You can make your own with some PVC pipe, some 3D-printed attachments, a speaker, and a few other odds and ends.

If your PVC pipe doesn’t match [DaniloR29’s] exactly, no problem. The files are in OpenSCAD so you can easily change them to suit your needs. One end of the PVC tee dips into soap solution to form a film — think like a soap bubble before you blow it out of the bubble wand. The other ends have the speaker and the cell phone camera.

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The Rise Of The Disappearing Polymorphs

Science and engineering usually create consistent results. Generally, when you figure out how to make something, you can repeat that at will to make more of something. But what if, one day, you ran the same process, and got different results? You double-checked, and triple-checked, and you kept ending up with a different end product instead?

Perhaps it wasn’t the process that changed, but the environment? Or physics itself? Enter the scary world of disappearing polymorphs.

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Lab-grown diamonds in 'cake' form -- before they are processed and polished.

Is It Time For Synthetic Diamonds To Shine?

The process of creating a diamond naturally takes between 1 and 3.3 billion years. Conversely, a lab-grown diamond can now be created in 150 minutes. But despite being an ethical and environmentally-friendly alternative to the real thing, the value of lab-grown diamonds has plummeted in recent years. Manufacturers are doing various things to battle the stigma and increase their value by being carbon neutral and using recycled metals.

About halfway through is where this article gets really interesting. Swiss jeweler LOEV has partnered with lab growers Ammil to produce a line of Swiss-made jewelry by relying on renewable energy sources. 90% comes from hydroelectric power, and the rest comes from solar and biomass generation. Now, on to the process itself.

A lab-grown diamond 'cake' before the excess carbon is lasered away.
You can have your cake and heat it, too.

Growing a diamond starts with a seed — a thin wafer of diamond laser-shaved off of an existing stone, and this is placed in a vacuum chamber and subjected to hydrocarbon gas, high heat (900 to 1200 °C), and pressure.

Then, a microwave beam induces carbon to condense and form a plasma cloud, which crystallizes and forms diamonds. The result is called a ‘cake’ — a couple of diamond blocks. The excess carbon is lasered away, then the cake is processed and polished. This is known as the chemical vapor deposition method (CVD).

There is another method of growing diamonds in a lab, and that’s known as the high-pressure, high-temperature (HPHT) method. Here, a small bit of natural diamond is used to seed a chamber filled with carbon, which is then subjected to high pressure and temperatures. The carbon crystallizes around the seed and grows around a millimeter each day.

As the industry evolves, lab-grown diamonds present a sustainable alternative to natural diamonds. But the consumer is always in charge.

Once you’ve got a stone, what then? Just use 3D printing to help create the ring and setting.