@jaseg@chaos.social
@jaseg@chaos.social avatar

jaseg

@jaseg@chaos.social

I am doing #electronics, #embedded programming, #python scripting, hardware security and recently some sewing. Pronouns: er/they

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Daojoan, to random
@Daojoan@mastodon.social avatar

I love that “you sound scared” has become a way to shut down critics of AI.

…yes.

yes, I absolutely am scared of it.

No, I’m not ashamed of that.

I don’t hate AI. I don't believe it’s going to destroy us terminator style.

But I’m scared half to hell of the misinformation, political divisions, unemployment, manipulation, spam and deepfake porn and what it’s going to do to our world.

Like it or dislike it, everyone should have a healthy level of fear about what this technology can do.

jaseg,
@jaseg@chaos.social avatar

@Daojoan "scared of AI" as in "scared of mold". Like mold, it's not going to become sentient and eat us all. But also like mold, it has a tendency to spoil previously good things, and my preferred amount of it in my (information) diet is zero with very few, carefully selected exceptions. Those exceptions, or the bries among the internet mold that is AI, are things like automatic transcription or translation.

cstross, to random
@cstross@wandering.shop avatar

AI models found to show language bias by recommending Black defendents be 'sentenced to death'

— The thing about this that terrifies me is the implication that lethal racism is embedded pervasively in our written culture at so deep a level that simple attempts to sanitize the LLM input data corpus doesn't even scratch the surface of the problem. https://www.euronews.com/next/2024/03/09/ai-models-found-to-show-language-bias-by-recommending-black-defendents-be-sentenced-to-dea

jaseg,
@jaseg@chaos.social avatar

@cstross I highly recommend a read through the research paper that article is referring to. They have a neat study design, and one of the more awful findings was that when they prompted them with AAE in a description task, the LLMs were even more racist than an english-language (human) control corpus dated to 1933.

jaseg, to random
@jaseg@chaos.social avatar

TIL that sudo, the unix command line utility, has a logo. And that logo is cursed.

https://commons.m.wikimedia.org/wiki/File:Sudo_logo.png

ja2ke, to random
@ja2ke@idlethumbs.social avatar

This video from Corridor Crew is pretty amazing. They re-create the nearly perfect compositing from the penguin dance sequence in Mary Poppins, which was achieved using high intensity sodium vapor lights and a very custom beam splitter, instead of a blue or green screen. It truly feels like a lost art rediscovered. When the matted footage just perfectly drops in I gasped haha https://m.youtube.com/watch?v=UQuIVsNzqDk

jaseg,
@jaseg@chaos.social avatar

@rberger @ja2ke LEDs have a substantially larger bandwidth than a sodium vapor lamp, but if they are too broadband depends on how narrowband their filters in the video are. You're right in that you definitely want a straight yellow/red/whatever LED instead of a phosphor-converted one, as the PC ones have much broader bandwidth, and usually have a peak of the original blue or purple showing through as well.

jaseg, to science
@jaseg@chaos.social avatar

Wow this is bad. Some Italian researchers decided there wasn't enough anti-right-to-repair hardware in the world already, and developed a way to physically profile and recognize individual battery cells that can be combined with classic DRM technologies to prevent non-OEM battery cells from working inside a device, even if the classic DRM portion is circumvented. Whyyyyyy?!

https://dl.acm.org/doi/pdf/10.1145/3576915.3623179

jaseg, to kicad
@jaseg@chaos.social avatar

At my work, I wrote , a security mesh generator plugin for . A security mesh is a set of labyrinth-like traces covering an area on a to detect someone drilling or sawing through it. I'm happy to report, that you can now install KiMesh on KiCad nightly through the built-in plugin manager.

A security mesh covering an irregular shape on a PCB. The mesh has two traces, that go around the entire area in a random fashion, covering it completely.

jaseg, to physics
@jaseg@chaos.social avatar

Researching inductor parasitics, I found this cool manuscript by radio amateur David W Knight. To visualize the E-field in and around coils, they used a gas discharge tube! Even if you're not up for the math, check out the PDF linked below for a few more cool pictures 😄

https://g3ynh.info/zdocs/magnetics/appendix/self_res/self-res.pdf

jaseg, to origami
@jaseg@chaos.social avatar

New boards arrived with silk made in from a sheet of patterned paper. The silkscreen covers the mostly empty bottom layer, with the top silk containing all component references. The footprint in the middle is a socket for a Würth WR-WST direct-to-board connector that I'm starting to use as a much cheaper and more convenient alternative to the offerings of Tag-Connect.

jaseg, to linux
@jaseg@chaos.social avatar

So my just catastrophically self-destructed. I was using arch with the yubikey full-disk encryption package, when the machine hung and crashed during a system update. The machine crashed exactly after the old initramfs files were cleaned up, and before the new ones were written to disk. Since the yubkikey fde thing stores the seed ("challenge") for the luks key in the initramfs, all copies of the seed are gone now, and the data on that disk is unrecoverable.

jaseg,
@jaseg@chaos.social avatar

Quite the failure mode if you ask me. I guess I will be scraping that yubikey fde thing from all of my machines now, and go back to plain passphrases. Deleting the old seed files before the new ones have been written and flushed to disk is a pretty bad design error.

jaseg,
@jaseg@chaos.social avatar

Update to the update: The creators of the yubikey full disk encryption thing have responded to my bug report with what is essentially a shrug emoji and the line "I hope you had [a backup]".

I don't think that's an appropriate reponse from the maintainers of a critical piece of software like this. I think if you choose to release software like this, you have a responsibility to either make it good or to at the very least warn users that it's bad.

jaseg, to science
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In case you were wondering, this is what a tray of cookies looks like on a thermal camera, fresh out of the oven (first pic) and during cooling (the other pics). The second pic shows traditional German cinnamon waffles, the others show shortcrust cookies.

The applications of thermal cameras in the kitchen are totally underrated. You can easily tell which ones are cold enough to be stacked and put into boxes.

Temperatures shown in the pictures are in Celsius.

#thermalcamera #science

A thermal image of a table with several wire racks full of traditional German cinnamon waffles cooling off. A cinnamon waffle maker is in the bottom of the image next to the wire racks.
Several wire racks of star, heart and holiday tree-shaped cookies cooling off. The hottest cookies have almost 95 Celsius surface temperature, the coldest are only 10 or so celsius above ambient temperature. The differences between the cookies at different stages of cooling are easily discernible.

jaseg, to Electronics
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RF transistor manufacturer CEL tells you in their datasheets not to lick their transistors.

https://www.cel.com/documents/datasheets/CE3512K2.pdf

jaseg, to embedded
@jaseg@chaos.social avatar

Here's a neat trick for SWD/JTAG-debugging boards that use scary voltages, when you're afraid of toasting your computer: Some wonderful person on github has ported the firmware to those dirt cheap ESP8266 wifi modules (the cheaper old generation), so you can just plonk down an ESP-01 footprint and your target shows up on your wifi with a GDB remote exposed on a TCP port.

It's hacky as hell, but I got it to build for a stock 1MB flash module.

jaseg, to Electronics
@jaseg@chaos.social avatar

The boards for , a light installation I'm doing just arrived. Here's some pictures of the 'd bottom sides.

An abstract fog pattern printed on the bottom side of a small circuit board using a half-tone technique.
A close-up of the first picture showing detail around the circuit board's pads, where the half-tone pattern stays clear of the pads.
A close-up shot of the second picture, showing that the half-tone pattern is based on a random scattering of points instead of some geometric pattern.

jaseg, to Electronics
@jaseg@chaos.social avatar

So, on that new JLCPCB colorful silk screen feature that's making the rounds atm. From what I can tell, the colorful silkscreen layers are just plain SVG files, but they encrypt them in a way that only EasyEDA and JLC can read them (and you can't). That means not only can these Gerbers never work with other vendors, you can't even export your own design from EasyEDA in a way you, yourself, can read or import in another tool.

jaseg, to random
@jaseg@chaos.social avatar

Just found this smol LCD on aliexpress, and now I want to build something with it. What would you make with it?

Link: https://www.aliexpress.com/item/1005003745628043.html

jaseg, to random
@jaseg@chaos.social avatar

Today I found out that Lenovo publishes a big honking PDF with the full technical specs of all of their current laptops, tablets and desktops. Enjoy: https://psrefstuff.lenovo.com/syspool/Sys/i_pdf/psref618.pdf

jaseg, to random
@jaseg@chaos.social avatar

A new halftone algorithm is on its way to ! This one adapts the underlying grid pattern to both conform to edges, and to maximize contrast by adjusting cell size.

The test picture is this one by photographer Marlon Schmeiski: https://unsplash.com/photos/a-man-with-tattoos-sitting-on-a-stool-mMT3bxPxL2s

jaseg, to Electronics
@jaseg@chaos.social avatar

For the longest time I was to cheap to get a proper soldering fume extractor for my occassional hobby soldering (not shit ones start around 500 €). After using just a PC fan for years, yesterday I finally improvised something nicer from an Ikea air purifier w/ activated carbon filter, an old carton and some leftover air hose from our air conditioner. I took before/after measurements with an Airthings View Plus on the same desk and found that this improv solution works great 😄

A desk with soldering equipment and a PCB. Next to the PCB lies the end of the thick air hose.
A graph showing PM2.5 particle density, showing a peak deep in the red zone at around 60 microgram per cubic meter.
The same graph, but tjis time it tops out still in the green zone below 10 microgram per cubic meter.

jaseg, to Electronics
@jaseg@chaos.social avatar

This is really cool: About ten years ago, a few friends and I built the first , a very large display made from crates of glass bottles stacked up sideways, with adressable LEDs stuck into the bottles from the back. Now Hito Steyerl, a renowned artist, used a Matelight inspired by the actual one we hacked together back then at c-base as a part of one of her installations, called "Green Screen". Here's an article on the exhibition, and a photo:
https://www.theguardian.com/artanddesign/2023/jun/13/post-internet-artist-hito-steyerl-refusing-honours-big-tech

jaseg, to Electronics
@jaseg@chaos.social avatar

New boards just arrived, with silk made with :3

A black PCB is lying on a red desk. The PCB has gold-plated pads and an oblong shape. In the middle of the PCB, there is a big array of 1206 size SMD LED footprints with ten rows and more columns than fit inside the picture. Outside the array there is one transistor footprint per row and one resistor footprint per column, and a smattering of SOIC-package IC footprints and small passives.

jacqueline, to random
@jacqueline@chaos.social avatar

the good shit has arrived

jaseg,
@jaseg@chaos.social avatar

@jacqueline Looking at the datasheet for that solder made me notice that I never really understood the tradeoff in silver content in SAC lead-free solder, so I did a little bit of research.

In case anyone is interested, I found a really nice paper that goes into detail on shock performance, temperature stress performance, wetting characteristics and more. Here's a link:

https://smtnet.com/library/files/upload/Effect%20of%20silver%20in%20common%20leadfree%20alloyspaperEng042309.pdf

arturo182, to random
@arturo182@mastodon.social avatar

I live in the contstant anxiety of someone making the same project as me before my lazy ass finishes it 😬

jaseg,
@jaseg@chaos.social avatar

@arturo182 I know that anxiety. I always tell myself that it's okay to do something that has been done before, just for myself, because I like doing it. It's hard to internalize that though.

cccpresser, to random
@cccpresser@chaos.social avatar

If in doubt, use more flux.

the plan is to bring those to future events.

jaseg,
@jaseg@chaos.social avatar

@cccpresser I want one of these, but for flux

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