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MatthiasWandel

792 karma · joined June 21, 2015

YouTuber and creator of woodgears.ca since 2007 Used to work at Research in Motion (later Blackberry) before that.
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MatthiasWandel··on Why 12 notes in Western music?
There was 12 notes before there was even division. It was Bach that pushed equal temprament (equal spacing). Before that, the ratios were actual ratios (perfect 4ths and 5ths), though you couldn't just transpose music and expect to sound good.
MatthiasWandel··on Hacker News is a masterpiece
So what makes Haker News great is a lot of "features" that it doesn't have. How ironic that others spend so much resources adding features that are ultimately detrimental.

But I guess it's a matter of who the audience is. If you want to appeal to the masses, some of these "features" probably do help.

MatthiasWandel··on How fast can a 6502 transfer memory?
For games that scrolled the screen, those had to happen essentially between scans, so a lot of tricks were employed. Fixed addresses in the code, unrolled loops, and self modifying code to avoid the expensive zero page indicrect indexed addressing mode (the slowest instruction on the CPU). The other trick was to start moving the first line of screen just after it got displayed, which would give you nearly two jiffies to do it before the scan caught up to you on the next frame.
MatthiasWandel··on The true cost of linked lists
Why don't I like linked lists? Cause they are complete disarray :)

Ok, not a great pun, but I have always used arrays when possible, even for stuff that needs inserting. I just assume I won't have a million elements to shuffle.

MatthiasWandel··on In 1997, Wired Predicts Things That Could Go Wrong in the 21st Century (2021)
There's an awful lot of points on there that are true or partially true. But some things, like terrorism, loomed much larger then than they do today.
MatthiasWandel··on In 1997, Wired Predicts Things That Could Go Wrong in the 21st Century (2021)
That's very subjective. Some would say wokeism threatens progress, others say anti-wokeism ghreatens progress because wokeism IS progress. Anti-science is just saying that the other side disagreees with some science that is incovnvenient to them (both sides). I would say they didn't get that one right. They didn't predict today's divisiveness.
MatthiasWandel··on Watching the World Wrecking
I think believing the propaganda for Russians is a matter of mental and physical self preservation. If you know it's a war and it's bad, what do you do? Remain silent - bad for mental health. Say or do anything about it - physically dangerous. It's easier and safer live in the comfortable "reality" presented by the propaganda, taking the attitude "just tell me what to believe so I will be safe"
MatthiasWandel··on DC Circuit Water Analogy (1998)
Unfortunately, water isn't as simple as electricity.

Pipes almost always end up having turbulent flow inside, in which case, pressure drop is proportional to flow rate squared. Whereas for electricity, voltage drop is always proportional to current. This leads to problems when trying to use circuit analogies when trying to solve for pressure drop in a system of pipes.

MatthiasWandel··on Build a weather station with Elixir and Nerves
I don't understand.

Why all these software tools for publishing and managing the data. Why not just put the data in a csv file from a python script, then use gnuplot to plot it when requested from a web server running on the pi.

Reminds me of the recent hacker news post "is this madness ever going to end?" https://news.ycombinator.com/item?id=29898030

MatthiasWandel··on I made my first web0 website today. It's so cool it just works
And yet it has stuff that wouldn't be recognized by early browsers, like https, or the viewport meta tag (useful for mobile)
MatthiasWandel··on Testing the strength of different wood species
Typically the beam has to fit where it needs to go. A lighter beam doesn’t mean you have room for a bigger one.
MatthiasWandel··on ATX-80 – ZX-80 computer clone with ATmega8 processor
Back in the day, the printer port was the way to interface experiments on the cheap. I had a spare printer card just in case I blew one up. There were expensive A/D boards and such used in labs, but it was too expensive for hobbyists. On the cheap, best to use a commodore 64.
MatthiasWandel··on Office 2000 is good to go
Still using office 2000. its simple and fast, never liked the later bells and whistles like the "ribbon". Sadly, windows 10 doesn't get along with it perfectly well.
MatthiasWandel··on Making the dislike count private across YouTube
the ability to hide the like/dislike counts has been there all along. I don't see why they want to take this choice away from creators.
MatthiasWandel··on Nine Raspberry Pis powering an office (2016)
Possibly the engineers working there took account not only the size of the HDMI connector, but also the plugs that go into them. if you put two connectors next to each other, you would only be able to use one at a time.
MatthiasWandel··on Automating My Air Conditioner
Yes, indeed. If it's a cheap one, it's starting current will probably be 4x it's run current. But it's probably a 400 watt unit, and at 1600 watts for starting, barely within spec for the tiny relay in the smart plug. That said, I have blown the relay in one of my smart plugs with switching motors. But I cycle a dehumidifier in a similar way, and that's been running for two years now.
MatthiasWandel··on The rise of user-hostile software
This isn't new. I was annoyed enough to write a rant about it on my website back in 2004, 17 years ago. http://www.stentex.net/~mwandel/rants/hp_scanjet_4600.html
MatthiasWandel··on Cargo cult programming (2020)
Its the antithesis to "design patterns", "best practices" and whatever other buzzword comes along.
MatthiasWandel··on “Plug and socket”, industry group pushes for "obvious" change in terminology
Just because something is true doesn't make it something we are allowed to acknowledge as being so.
MatthiasWandel··on “Plug and socket”, industry group pushes for "obvious" change in terminology
Plug/socket terminology is not necessarily the same as male/female terminology. The socket can be male, if it is the one with the metal pins. The power connector on the back of a PC is a good example. https://en.wikipedia.org/wiki/Gender_of_connectors_and_faste...

Of course, people aren't necessarily using the terminology completely correctly as it is.

And then there's the connectors on fancy RF equipment that can assume either role!

MatthiasWandel··on Hacking a PC sound card to read temperature and liquid level sensors
25 years ago I treasured my paper copy of an article about how to do general purpose I/O on a printer port, and always kept an old PC around for experiments for that. But with Raspberry Pi computers, interfacing is so much easier. And no need to worry about blowing up a precious motherboard, because they don't cost much. And the Pi4 is as fast as oldest PCs I still have, core 2 duos.
MatthiasWandel··on U.S. Commerce Department rescinds TikTok, WeChat prohibited transactions list
Tiktok is all about Short attention span, whereas hacker news is longer attention span. I don’t expect too many tiktokers to go so far as to log in and down vote.
MatthiasWandel··on Modern “Freedom” Means Being a Slave to Impulses
I suspect your the nature of your objection is something you can't quite grasp yourself. Calling it sexist seems a safe way of attack.

It is one thing to know that we like or don't like something. Much harder is understanding why. Usually we give the first acceptable "reason" that comes to mind rather than trying to figure it out. Figuring out why we like or not often takes a number of thought experiments.

MatthiasWandel··on Suicide by Culture (2017)
I can totally believe it. I have a webpage about a “wasp sucking machine”. I was amazed at how many google hits that got for “sucking machine”, back when you could see the queries. Top country for those searches was Saudi Arabia.
MatthiasWandel··on A fringe Japanese religion built a pro-Trump social media empire
Rejection of BLM and SJW ideals. Desire for equality of opportunity over equality of outcome. Much of the world is much less left leaning than the united states. Not that all of the united states is left leaning overall, but a lot of very important institutions, such as universities, education, and traditional media are.
MatthiasWandel··on Daves Old Computers – Robotic DVD Loader
Built one of those 15 years prior. https://www.sentex.ca/~mwandel/tech/changer.html
MatthiasWandel··on Germany, once a model, is swamped like everyone else by pandemic's second wave
Atlantic Canada was able to wipe out the virus completely early in the pandemic. But travel keeps bringing it in, causing outbreaks here and there, but each time so far they have gotten The outbreaks under control. Cases per capita are about a tenth of the rest of Canada, which in turn is half of what it is in the us. And ironically, restrictions here are less than in many hard hit areas.
MatthiasWandel··on 68% of the top links on Facebook since September are in support of Donald Trump
Good point there, split between Obama and Biden. But there's only one like trump, and his fans are very passionate. That's what worked for him in 2016 too.
MatthiasWandel··on A closer look at Raspberry Pi RP2040 Programmable IOs
Had not thought of that. But that will give me one count per bar that goes past the encoder, yet there are four transitions that could potentially be counted. Of course, the pulses are not precisely symmetrical, so the four sub-counts are potentially not the same size.
MatthiasWandel··on A closer look at Raspberry Pi RP2040 Programmable IOs
I guess the ting to do would be to somehow wait on a change on either line. Could be done with a wait on just one line if I only want half counts instead of quarter counts
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