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    What is Ultra Wideband and why it is good for location services?

    Danie van der Merwe · Wednesday, 9 June - 17:01

If you’ve been following the world of mobile phone technology of late, you may be aware that Apple’s latest IPhones and AirTag locator tags bring something new to that platform. Ultra wideband radios are the new hotness when it comes to cellphones, so just what are they, and what’s in it for those of us who experiment with these things?

The real trick up the sleeve for UWB comes not in its data transfer capabilities but in location services, because it allows the synthesis of extremely short RF pulses on the order of a fraction of a nanosecond by combining frequencies across that wide bandwidth. These pulses can be used for extremely accurate time-of-flight measurements between transmitter and receiver, allowing for the distance between them to be determined to an accuracy of a few centimeters. In a system such as Apple AirTags where a tag is likely to have visibility to more than one UWB-equipped Apple product, it can then be used for triangulation with several sources, and thus for accurate 2D and 3D positioning.

See https://hackaday.com/2021/06/09/what-is-ultra-wideband/

#technology #hardware #RF #ultrawideband #UWB

  • What Is Ultra Wideband?

    If you’ve been following the world of mobile phone technology of late, you may be aware that Apple’s latest IPhones and AirTag locator tags bring something new to that platform. Ultra w…

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    chrisalzo

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    The Decentralized Web of Hate - How and Why Hate Groups Started Using Peer-2-Peer Technology - But P2P Can Be Used For Positive Social Impact Too

    Danie van der Merwe · Friday, 14 May - 19:41 · 1 minute

Emmi Bevensee, of Rebellious Data, SMAT, and the Centre for Analysis of the Radical Right, has finished the second of Rebellious Data new Research Insights series of deep dives into the critical topics of our time. This report looks at how hate movements are decentralizing using emerging technologies in ways that make them harder to combat. These technologies ask us critical questions about the future of society and the internet but also pose incredible potential to help us along our way.

This was a real growing issue near the end of 2020 and there was a lot of worry that the technology intended for privacy and protection of those feeling marginalised, would in fact be taken over and abused by hate groups. I saw those hate groups making a presence on Aether P2P network, and the debate starting there, but also on Scuttlebutt and RetroShare.

What is different about P2P is that your network and what you see in your feed, consists of who you are linked to and following. So if your 'community' unfollows or blocks problem individuals, they disappear from view. It does not mean they are gone as they can exist in their own community, but a P2P network is not a centralised moderated service liker Twitter or Facebook, and it effectively protects everyone. It also cannot really be shut off as it only exists between individual peers without any central server (hosting) or country managing it.

If the report whets your appetite to try Scuttlebutt and venture down the rabbit hole, I'd suggest trying it via the Planetary mobile app, or Patchwork for desktops.

See https://rebelliousdata.com/p2p/#more-2630

#technology #P2P #SSB #socialnetworks #decentralised

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    System76’s Launch configurable mechanical keyboard is fully open source hardware and firmware for Linux, MacOS and Windows... At a price

    Danie van der Merwe · Friday, 14 May - 18:56 · 1 minute

System76 unveiled its first keyboard, which also happens to be the first open-source configurable mechanical keyboard. It is easy to swap out the keys, choose the type of switches (Royals which offer a muted clack, and Jades which produce an addictive click sound), can fully remap the key layout in software, it has RGB lighting, as well as it acts as a high-speed USB hub to plug additional USB devices into it.

That said it is fairly pricey at $285 and may lack the additional keys that gamers like to have (media control keys with volume, macro program keys, and number pad), and in my case I like the actual keycap lettering to be lit through the keys (that allows the RGB lighting in effect to change the "colour of the key" and can be quickly changed per game without mechanically removing the keycaps. It is possible though that in future, transparent keycaps could be available that will anyway achieve this, so it may not be a big drawback.

It is well-built though and has certainly packed some requested features in, and the split spacebar makes better use of space. Being open source hardware there is also a good chance of 3rd party support for keycaps and other features. My Redragon Yama mechanical keyboard for example has limited Linux support for the customisation side and I had to use Windows to program it.

See https://news.itsfoss.com/system76-launch-mechanical-keyboard/

#technology #opensource #hardware #keyboard #system76

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    Geekmark benchmark shows identical hardware faster with Linux than Windows 10

    Danie van der Merwe · Saturday, 3 April - 14:34 edit

I have a Windows 10 SSD drive (for two games that would run some 3rd party add-ons under Linux) and a Manjaro Linux SSD drive for booting Linux (all Linux user data sits on a slower HDD). The Windows 10 side is not use for daily use so is a lot cleaner in terms of what (and how much) is installed.

That said, with the same graphics card and normal boot up with what auto starts, the Linux side shows a distinct edge.

Also, for comparison is the benchmark for my Core i7 CPU. The Big difference is the AMD has double the number of cores.

#technology #geekbench #benchmarking #windows #linux

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    Personal Blog Post Title

    Danie van der Merwe · Monday, 18 January, 2021 - 13:49

Body text here to just see where this is publicly visible outside of Movim on XMPP...

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    Yannv , Timothée Jaussoin , Matt

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    My Tech Blog is Online now at Movim

    Danie van der Merwe · Saturday, 19 December, 2020 - 14:55

Took me a few "movims" to realise how to set up a community blog but it is now online at https://nl.movim.eu/?community/news.movim.eu/gadgeteerza-tech-blog and I'll be posting my tech related stuff there.

Glad to see I can run it as a blog (much like Google+ Communities) so anyone should be able to comment on the posts, but not publish new posts, as this is way easier to moderate.

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    Matt , Matt , eyome , ericbuijs

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  • 6 February, 2021 Terrance

    How did you go about setting up the community blog? I've been trying to poke around a bit to see how one would go about it, but there's really not much documentation out there for end users.

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    27 Super Cool Raspberry Pi Zero W Projects for DIY Enthusiasts, Some of which I've not seen Before

    Danie van der Merwe · Saturday, 19 December, 2020 - 07:55 edit

The small form factor of the Raspberry Pi Zero W enables a new range of projects. In fact, a lot of people use the Pi Zero in the final version of the project after prototyping on a different full-sized Pi board. And, that’s because it consumes much less power compared to the flagship Pi boards and makes it ideal to build battery powered gadgets.

See https://itsfoss.com/raspberry-pi-zero-projects/

#technology #DIY #raspberrypi #hardware

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    Remap Keyboard And Mouse Buttons On Linux With The New Key Mapper GUI (Supports X11 And Wayland)

    Danie van der Merwe · Friday, 18 December, 2020 - 09:37 edit

The application supports per-device presets, and it allows using timed macros with the ability to repeat keys, wait between keys, hold a modifier while using a key, and more. Besides keyboards and mice, Key Mapper also comes with basic support for gamepads.

It's working nicely for my XP-Pen graphics tablet. I did have to execute the tip at the end though and re-login to activate seeing my devices.

See https://linuxuprising.com/2020/12/remap-keyboard-and-mouse-buttons-on.html

#technology #opensource #linux #utililities