81–90 of 180 posts
This is a really neat little project. Make sure to check out the other ones, some of which have been featured on HN before: https://mitxela.com/projects/hardware Personal favorite: the MIDI slide whistle.
That's beautiful. Nothing intelligent to add, just a very neat, clever and aesthetic project.
One of those brilliant ideas that seems obvious in retrospect. Given that the results are so compelling even when pulled together by hand out of relatively primitive discrete components, I’m wondering why we shouldn’t expect to see full color, high resolution versions from every random 7-letter drop shipper on Amazon next Christmas?
It's not a new idea -- they're called swept-volume volumetric displays, and they've been around for a long time [1]. But they're mostly kind of just toys. When you're limited to transparent glowing surfaces and you can't even touch them, there's really not a whole ton you can do. You can see a much larger non-spinning version made of LEDs suspended on cables [2] and it's very cool, but the novelty kind of wears off a…
Many years ago, someone did a similar holographic hack with a spinning hard drive motor, a piece of reflective plexiglass mounted upright on it, and a small projector. As the plexiglass carved out a cylinder, the projector sent a series of frames adjusted for each little slice of 3D space. [0] This gave me a wild idea: what if you could encode a low-resolution 3D video on the left channel of a stereo vinyl groove? [1…
I would pay $200+ for a bigger (50x50?), rugged, RGB version of this that you can make to display different images without coding.
It's not volumetric, but it's still really cool and may fit your use case https://spinprojector.com/
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There's gotta be some way to replace the rack-of-leds-spinner with something lighter. Mirrors? Acrylic light pipe matrix?
Why do you think the weight is the problem?
And we can't reduce RPM.
Get it light enough and you don't even have to center it that good.
Earlier quoted context omitted.
There's gotta be some way to replace the rack-of-leds-spinner with something lighter. Mirrors? Acrylic light pipe matrix?
I wonder if it would be simpler to just spin two phone screens glued back-to-back. You get higher resolution in about the same weight. Bandwidth would be a problem though.
Are phone screens (minus the phone etc) transparent?
Earlier quoted context omitted.
Why do you think the weight is the problem?
Because EVIL = RPM X WEIGHT. And we can't reduce RPM. Get it light enough and you don't even have to center it that good.