DIY RGB Icosahedron

573 点作者 blutack超过 3 年前

29 条评论

If anyone is curious, the origami stellated [1] icosahedron in the second image is built from Sonobe modules [2][3], a kind of modular origami. Basic structures formed by Sonobe units have 3-sided 45-45-90 pyramids on top of an underlying polyhedra with triangular faces.Each Sonobe unit functions as an edge in the underlying structure, so building a structure around an icosahedron, which has 20 faces and 30 edges, requires 30 units, and yields a stellated icosahedron with 60 faces and 90 edges.You can also build a stellated octahedron from 12 pieces, and a stellated tetrahedron (which actually just appears as a cube) with 6 pieces, but that's just the beginning [4]![1]: Strictly speaking, it's not a true stellation, which is formed by extending the planes of faces until they intersect. [2]: <a href="https://en.wikipedia.org/wiki/Sonobe" rel="nofollow">https://en.wikipedia.org/wiki/Sonobe</a> [3]: <a href="https://www.amherst.edu/media/view/290032/original/oragami.pdf" rel="nofollow">https://www.amherst.edu/media/view/290032/original/oragami.p...</a> (instructions for folding; I believe the image uses the two-mountain folds variation on the first page) [4]: <a href="https://www.polypompholyx.com/2017/01/modularorigami/" rel="nofollow">https://www.polypompholyx.com/2017/01/modularorigami/</a>

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doctorhandshake超过 3 年前

This is super bad ass.I made 8 LED icosahedra and 12 octahedra for a permanent lighting install in Boulder. They’re much larger (and thus were easier to make albeit much harder to handle ;) ) than this. I still gotta do the case study but some pics: <a href="https://www.instagram.com/p/Bv0dYbdH0yw/" rel="nofollow">https://www.instagram.com/p/Bv0dYbdH0yw/</a> <a href="https://www.instagram.com/p/Bv-sF0oH4Rd/" rel="nofollow">https://www.instagram.com/p/Bv-sF0oH4Rd/</a> <a href="https://www.instagram.com/p/B5czvt_n3ME/" rel="nofollow">https://www.instagram.com/p/B5czvt_n3ME/</a>[edit: less unintentionally self-aggrandizing]

jaywalk超过 3 年前

I'm in awe at the amount of patience required to hand-place 2400 tiny LEDs. I don't have it in me.

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jcims超过 3 年前

This is the kind of full stack developer I'd like to be. Started tinkering with electronics in earnest about a year ago but it feels like I'm a decade away from being able to build stuff like this of my own volition.

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Workaccount2超过 3 年前

Man, I lived that same nightmare scenario with the flipped G-S pins on a MOSFET.I had the board spun and excitedly soldered it all up. It was a relay logic project with a few micros, tons of LEDs, swaths of general logic chips, and a lot of relays. It was a hybrid mechanical computer, nothing massive, but a lot of components.Fired it up for the first time and got nothing. Just like OP I narrowed it down to the relay coils not firing. No signal out of the driving MOSFETs.Being a fool I had trusted a random online library for the MOSFET footprint, and of course the footprint had the G-S pins flipped. I painfully bodged one before deciding to just bite the bullet and spin another one. I cannot imagine doing 300 like OP did, good on him.

bla3超过 3 年前

Beautiful.If you're just skimming, be sure to slow down and read the "Bodge Time" section.

formerly_proven超过 3 年前

If you're not familiar with electronics the macro photographs might confuse you as to how small all of this is. The MOSFETs he reworked by hand are 1 mm across the longest edge. Wire looks like 0.1 mm, the individual strands in most stranded wire are this thick.

jopsen超过 3 年前

Wow, that's a lot of work...Next time (LOL), maybe put a gyro-sensor inside it, and program the light such that waves mimic motion... or...

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blutack超过 3 年前

I came across this randomly on kitspace (<a href="https://kitspace.org/boards/github.com/gregdavill/d20-hardware/d20-tri-panel-4x1/" rel="nofollow">https://kitspace.org/boards/github.com/gregdavill/d20-hardwa...</a>) and thought other people might be as impressed as I was!

jpm_sd超过 3 年前

Really cool project and brutally honest write-up, I LOLed at "I’ll leave that for future Greg to worry about."Keep up the good work!

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kzrdude超过 3 年前

Does anyone understand the 'footprint rotated 90 degrees' issue? I can't see it in the picture or understand what the problem is.

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punnerud超过 3 年前

This made my day, after watching the assembly video:«You assambled all 19 before testing first one?»«….Yes. I am not a smart. -_-*»When you are in the production flow, it is hard to stop for testing.. Good to see it’s not just me that can make this kind of mistake.

tired_and_awake超过 3 年前

From the future work aspect the author might consider adding an IMU to the device. It could mimic dice behavior or change state based on motion. Also a great opportunity to learn about dynamics and signal processing.

terom超过 3 年前

I wonder if the people commenting "I want one" would still agree if they knew how much it would cost to produce and assemble in small quantities. Would 1000€/piece even be enough to cover costs?

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roland35超过 3 年前

That is a beautiful project.With huge numbers of RGB LEDs I wonder if in the future using some sort of small FPGA per panel would make things easier? I have seen that done in some persistence-of-vision projects.

kryptn超过 3 年前

I'd love to design and build something like this myself, but all of the electronic design seems so daunting.Where's a good place to get started with this?

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monkpit超过 3 年前

I am looking to do something like this as a Christmas gift for my son. However, this looks pretty labor-intensive (300 bodge wires!).I have dabbled with arduino in the past but I am no expert with hardware.Does anyone have suggestions of cool projects similar to this? Toy-like LED things :)Or even a website I could browse to find similar projects (like Instructables maybe)?

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solarkraft超过 3 年前

This is interesting. I’ve been thinking of making an icosahedron shaped room lamp with separately controlled sides for a while and this might provide some inspiration and perhaps motivation to start thinking about it again.

rafaelturk超过 3 年前

This Amazing, pure Art. Kudos.

tmd83超过 3 年前

Just beautiful and a quick scroll seems to suggest a fairly involved undertaking. Hoping to have fun reading it but for now just enjoyed the look of it,I think having so many sides adds a lot of visual appeal.

qwertox超过 3 年前

Next step would be to add an IMU into it so that it can react to movement.Like behaving as if it's half full with water and make the liquid move around when placed on the table or picked up.

ChrisMarshallNY超过 3 年前

That is incredibly cool.I'd think it would be a great programmable D&D dice, except that it might not handle being tossed around.

derac超过 3 年前

Wow, amazing end result. It would be cool if it could detect orientation and change the animation based on that.

joejohns超过 3 年前

Is there any available resources in which I can jump start my way into making these kinds of creations?

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bullen超过 3 年前

I would make a usable display with leds like these if I could!

mhb超过 3 年前

It's a great write up, but is it really worth asking for free PCBs that would cost ~$5 for a project whose cost is >$100?

nxpnsv超过 3 年前

Spectacular!

micromacrofoot超过 3 年前

This is magical! This level of focus is impressive.

amelius超过 3 年前

> I went to assemble one, and when trying to determine the LED orientation I discovered a fatal flaw. I had the footprint rotated 90 degrees. (-___-)Why was that a problem? The leds are square, so you could just rotate them by 90 degrees?

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