jayyhu

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Submissions

Intel spinning out RealSense as standalone company

therobotreport.com

4 pointsby jayyhuil y a 2 ans0 comments

China sanctions US drone maker Skydio

85 pointsby jayyhuil y a 2 ans96 comments

The Original Prusa MK4S Is Here

blog.prusa3d.com

4 pointsby jayyhuil y a 2 ans1 comments

Japan's SLIM lunar lander miraculously wakes up

15 pointsby jayyhuil y a 2 ans1 comments

comments

l’année dernièrediscuss

The author points out that his changes have already been upstreamed to https://github.com/rp-rs/rp-hal

l’année dernièrediscuss

For the layman, 0 degrees celsius is also a good proxy for the distance to "room temperature" superconductor.

l’année dernièrediscuss

AFAIK the Section 301 tariff (and increases) only applies to parts imported from China/HK. There are lots of manufacturers on DigiKey that make their parts from elsewhere where these tariffs are not assessed. As a data point, I recently bought a bunch of Lite-on LEDs on DK, their COO was Thailand, and I wasn't tariffed for those parts.

il y a 2 ansdiscuss

Consider a scenario where you're editing a function:

  function foo() { return a*2.1^2+0.52/2 }

So you do a find-all regex "1.*5" and delete all matching occurrences (à la CRISPER) to get:

  function foo() { return a*2.2/2 }

But unbeknownst to you, the code is littered with a bunch of commented out versions of the same function you're trying to edit:

  /* function foo() { return a*1.5/2.1 } */
  /* function foo() { return a*1.95/2.4 } */

And now those commented out versions now become:

  /* function foo() { return a*/2.1 } */
  /* function foo() { return a*/2.4 } */

And now the whole program doesn't compile anymore--or your patients get Leukemia. Oops.

il y a 2 ansdiscuss

While it might be hard for the US to make lithium batteries that are competitive economically, there are still many countries in the world that can make them economically that are not China, eg. SK, Japan, Taiwan, and the rest of SEA. For Skydio, surviving these sanctions is just a matter of moving their supply chain away from China.

il y a 2 ansdiscuss

From the article's opening sentence, it's clear that they are being sanctioned for doing business with Taiwan's Fire Agency, and not for any military reasons.

  A few weeks ago, China announced sanctions on Skydio for selling drones to Taiwan, where our only customer today is the National Fire Agency.

il y a 2 ansdiscuss

Sanction aside, this action is a wake-up call for all US based companies operating in geopolitically sensitive industries that they absolutely need to diversify their supply chain away from China.

And in terms of the sanction itself, it’s definitely a reasonable response by China, given the fact that DJI is heavily sanctioned by the US government.

il y a 2 ansdiscuss

The actual paper describing the construction of the MUSE Stellarator: https://www.cambridge.org/core/journals/journal-of-plasma-ph...

il y a 2 ansdiscuss

I want to clarify that they actually did build a transistor-like device, and not just hypothesize about it. I missed section 3.2 when I initially skimmed the paper, which demonstrates and shows the results of a working “transistor”.

Unfortunately I can’t edit my original post, so apologies for causing any confusion.

il y a 2 ansdiscuss

It looks like the editors have amended the title of their article since this was initially posted. The original title was just “3D-printed Active Electronics”

il y a 2 ansdiscuss

Reading the article, it looks like so far they only have a working resettable fuse (a passive device), and only hypothesize that a transistor was possible with the copper-infused PLA filament. So no actual working active electronics.

And from the paper linked in the article[1], it seems the actual breakthrough is the discovery that copper-infused PLA filament exhibits a PTC-effect, which is noteworthy, but definitely not "3D-Printed Active Electronics" newsworthy.

[1] https://www.tandfonline.com/doi/full/10.1080/17452759.2024.2...

il y a 2 ansdiscuss

They made a video that explains how to navigate the roundabout, and shows what it will actually look like (with yield markings)[1]

[1]: https://youtu.be/07_m7HHiZRw

il y a 2 ansdiscuss

Yep, they explicitly call out that the onboard voltage regulator can work with a single lithium ion cell.

il y a 2 ansdiscuss

You're right, after re-reading the Power section on the datasheet it seems connecting 5V to the VREG_VIN should suffice to power the digital domains, but if you want to use the ADC, you still need a external 3.3V source.

il y a 2 ansdiscuss

Edit: See comment below; The RP2350 can be powered by a 5V supply.

il y a 2 ansdiscuss

Why Germany? Both Netflix and Broadcom are American companies, so isn’t it more logical to pick a venue in the US? Was Broadcom’s case so flimsy (with regards to US patent law) that they had to find an overseas jurisdiction to get a favorable ruling?

il y a 2 ansdiscuss

The alternative is to do what JS does: https://www.destroyallsoftware.com/talks/wat

il y a 2 ansdiscuss

The STM32 F0/G0/C0 lines come to mind. More I/O, more peripherals and built-in flash.

For hobbyist levels, buying 1-10 pcs they are comparable in price to an RP2040 + SPI flash. However at volume pricing, the STM32 MCU's can be cheaper than just the RP2040 itself. I do think Raspberry Pi needs to figure out volume pricing if they want to be competitive for anything that's not just hobbyists.

il y a 2 ansdiscuss

Also you could potentially damage the on-board voltage converter/regulator, since most aren’t designed to be back-driven from their outputs.

il y a 2 ansdiscuss

He also has a video on YouTube for Conical slicing (for those that prefer watching videos): https://www.youtube.com/watch?v=1i-1TEdByZY