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Quorten Blog 1

First blog for all Quorten's blog-like writings

Raspberry Pi file server speeds, power saving, remote push button

quorten

2018-04-28

Categories: raspberry-pi   important   reiterate  
Tags: raspberry-pi   important   reiterate  

Important!

What kinds of speeds can you expect out of a Raspberry Pi file server?

20 MB/s expectation from Raspberry Pi. So, actually you can get a 100 Mbps speed out of a Raspberry Pi. Raspberry Pi Zero? Maybe, at least it will come close.

20180427/DuckDuckGo raspberry pi zero sd card read speed file server
20180427/https://raspberrypi.stackexchange.com/questions/15123/network-storage-on-sd-card

Words of unreliable SD cards? How reliable are they with Raspberry Pi?

20180427/DuckDuckGo raspberry pi how reliable sd card

Answer: Do make sure to have adequate backup, but don’t worry about the lifespan being too short.

20180427/https://raspberrypi.stackexchange.com/questions/38321/raspberry-pi-lifespan-reliability
20180427/https://www.geek.com/chips/a-geek-tests-12-micro-sd-cards-with-a-raspberry-pi-to-find-the-fastest-1641182/

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H.264 successor, Raspberry Pi libre boot and Odroid, space garbage trucks, SLS patent expiration

quorten

2018-04-15

Categories: misc   media-prog   raspberry-pi   3d-scanning   3d-scaner   3d-printing   important   reiterate  
Tags: misc   media-prog   raspberry-pi   3d-scanning   3d-scaner   3d-printing   important   reiterate  

Important! H.264? The successor is H.265.

  • But, the future is not so clear as is the case with H.264. There are concerns over patent royalties and quite a number of alternatives currently (2018) available.

20180414/https://en.wikipedia.org/wiki/H.264/MPEG-4_AVC
20180414/https://en.wikipedia.org/wiki/High_Efficiency_Video_Coding
20180414/DuckDuckGo mpeg-2 raspberry pi patent expire

Old news, I think this is the same thing I saw about libre boot of Raspberry Pi.

20180414/https://hackaday.com/2017/01/14/blob-less-raspberry-pi-linux-is-a-step-closer/

Interesting. Space garbage trucks. Robotic tools to track space junk is curiously a “challenge” to track a non-communicating object.

20180414/https://hackaday.com/2018/04/09/a-look-at-the-uks-new-space-garbage-truck/

Interesting but not quite related. A computationally powerful alternative to Raspberry Pi.

20180414/https://hackaday.com/2016/03/16/hands-on-with-the-odroid-c2-the-raspberry-pi-3-challenger/

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3D scanning file formats, failure of 3D PDF, 3D scanning users

quorten

2018-04-15

Categories: 3d-scanning   3d-scanner   inven-sys  
Tags: 3d-scanning   3d-scanner   inven-sys  

Relating to the failure of 3D PDF files.

20180414/https://tex.stackexchange.com/questions/1030/for-movie15-based-3d-embeds-how-to-get-u3d-files

This TeX StackExchange generated a very interesting discussion. How do you embed 3D files inside of a PDF file? Quite quickly in, it became obvious that the methods and techniques of one party did not transfer to those of the other party. “I’m working with imaging data, not drawings, so those conversion methods will not work for me.”

So, let’s step back for a moment. Think about what’s going on with my most recently collected information. Even though we’re all purportedly working on the same problem, 3D data, each and every party involved has their own preferred tools to use to approach the problem, and poor interoperability is the norm, not the exception.

So, let’s start off with the basics. 3D printing and 3D scanning are two opposite sides of a spectrum. They represent two very different modes of usage, with a clear majority representation on the side of 3D printing, in preference to the 3D scanning user base.

So, what’s going on to cause this? Fundamentally, it is due to user and market segmentation. So, what are these market segments?

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U.S. government Congress composition

quorten

2018-04-11

Categories: random  
Tags: random  

U.S. government, Congress is composed out of the Senate and the House of Representatives. Both are elected with a per-state representation, with the House of Representatives larger and with multiple people per state.

20180410/https://en.wikipedia.org/wiki/Senate
20180410/https://en.wikipedia.org/wiki/House_of_Representatives
20180410/https://en.wikipedia.org/wiki/United_States_Congress
20180410/https://en.wikipedia.org/wiki/United_States_House_of_Representatives

Water fluoridation and negative effects of too much

quorten

2018-03-30

Categories: random  
Tags: random  

Fluoride in water? Fluoride really helps with dentistry, we know, but what about the criticisms of fluoride in water? Okay, so, here’s what’s going on.

Many water sources have naturally occurring minerals in them, some more than others depending on the geography. In earlier times, this meant that some locales were getting too much fluoride in their drinking water, leading to dental fluorosis. Others were not getting too much. Fluoride has a protective effect on the teeth when used properly, but generally it is not good for the body, so it seems. Fluoride in water can absorb into the body while showering or bathing. Nevertheless, humans were historically exposed to fluoride in small concentrations, depending on how they sourced their water.

In modern times there are still debates about this depending on people’s municipal water supply. Additionally, with the advent of water filtration machines that can be purchased on the commercial market, where the buyer tends to have far less relevant scientific knowledge than the manufacturer, there is yet another source of “locale” problem depending on which filtration unit someone buys, given the variance in effectiveness in filtration units.

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CentOS or Debian? And MHVTL.

quorten

2018-03-30

Categories: unix  
Tags: unix  

CentOS or Debian? Which one? Okay, so now I have a clear and definitive answer from experience.

CentOS is most useful only in specific company environments. Many of the practices and methods for working with CentOS are highly specialized, meaning to build a machine only to be used for a specific purpose.

If you want something more general purpose, like is the case for libre software development at home, you definitely want to go with the Debian side of matters. DKMS is well supported which is needed for a variety of applications, but DKMS does not exist on the Red Hat side of affairs. Also, the official package repositories are much broader, a big boon to typical hobbyist use that is much more inclusive in features and functions on a single machine for “development.” The typical hobbyist use for specialized configurations is embedded systems. The other use, large server farms, is of course too expensive.

I saw that the MHVTL installation uses rpmbuild to build the kernel modules from source, and I was wondering why they didn’t simply use DKMS in a binary package to do likewise. So it turns out that Red Hat doesn’t want to support DKMS, that’s why.

20180329/https://access.redhat.com/discussions/2336291

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Calculating negative sleeves archival storage requirements

quorten

2018-03-29

Categories: pentax-k-1-camera  
Tags: pentax-k-1-camera  

Working with rolls of 36 exposures, and trying to use your 28 exposure sleeves most efficiently?

36 = 3 * 3 * 2 * 2
28 = 7 * 4

8 extra, 2 rows extra.

Multiply by 3 = 6, 1 unused row.

36 * 3 = 108
28 * 4 = 112
Extra: 4

So, the solution. For three rolls of 36 exposures, use 4 sleeves. This will leave you with only 4 unused exposure positions in your sleeves, or one row. Under ideal conditions, of course. If you cut apart your own exposures, for sure you can get ideal conditions.

% Waste: 4 / 112 = 3.6%

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