Hackaday Links: November 24, 2024

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We received belated word this week of the passage of Ward Christensen, who died unexpectedly back in October at the age of 78. If the name doesn’t ring a bell, that’s understandable, because the man behind the first computer BBS wasn’t much for the spotlight. Along with Randy Suess and in response to the Blizzard of ’78, which kept their Chicago computer club from meeting in person, Christensen created an electronic version of a community corkboard. Suess worked on the hardware while Christensen provided the software, leveraging his XMODEM file-sharing protocol. They dubbed their creation a “bulletin board system” and when the idea caught on, they happily shared their work so that other enthusiasts could build their own systems.

BBSs were the only show in town for a long time, and the happy little modem negotiation tones were like a doorbell you rang to get into a club where people understood your obsession. Perhaps it’s just the BBS nostalgia talking, but despite the functional similarities to today’s social media, the BBS experience seemed a lot more civilized. It’s not that people were much better behaved back then; any BBS regular can tell you there were plenty of jerks online then, too. But the general tone of BBS life was a little more sedate, probably due in part to the glacial pace of dial-up connections. Even at a screaming 2,400 baud, characters scrolled across your screen slower than you could read them, and that seemed to have a sedating effect on your passions. By the time someone’s opinion on the burning issues of the day had finally been painted on your monitor, you’d had a bit of time to digest it and perhaps cool down a bit before composing a reply. We still had our flame wars, of course, but it was like watching slow-motion warfare and the dynamic was completely different from today’s Matrix.

Speaking of yearning for a probably mythical Golden Age, Casio has announced a smart ring that looks like a miniature version of their classic sports chronograph wristwatch. The ring celebrates Casio’s 50th anniversary of making watches, and features a stainless steel case made by metal injection molding. The six-digit LCD is pretty limited in what it can display, and the ring doesn’t do much other than tell the time and date and sound alarms. So we’re not sure where the smarts are here, except for the looks, of course.

We got a tip recently on a series of really interesting videos that you might want to check out, especially if you’re into EMC simulations. Panire’s channel is chock full of videos showing how to use openEMS, the open-source electromagnetic field solver, with KiCad EDA software to simulate the RF properties of high-speed circuits. He’s got some in-depth videos on getting things set up plus some great tutorials on creating simulations that let you see how your PCB designs are radiating, allowing you to make changes and see the results right away. Very useful stuff, and pretty fun to look at, too.

Here at Hackaday, we get a surprising and disappointingly regular stream of projects that claim to finally have beaten the laws of thermodynamics. So the words “Perpetual Motion” are especially triggering to us, but we instantly put that aside when we saw the title card on this video about the Atmos Clock. No, it’s not perpetual motion, but since as the name suggests, being powered by atmospheric pressure and temperature changes, it’s about as close as you can get. We remember one of these beautiful timepieces on the mantle in our grandparents’ house, gifted to “Grampy” for years of faithful service by his employer. It was a delicate machine and fascinating to watch work, which it only briefly did once we grandkids got near it. Still, watching how the mechanism worked is pretty interesting stuff.

And finally, if you haven’t checked out The Analog, you really should. It’s a weekly newsletter written by our friend Mihir Shah and is full of interesting tidbits from the world of electronics and technology. This time around he gifted us with a video that looks inside optical sorting in food processing. You’ve probably seen these in action before, where cascades of objects — grapes in this case, obviously in a winery — are spread out on a high-speed conveyor belt under the watchful gaze of a computer vision system, which spots the bad grapes and yeets them into oblivion with a precisely controlled jet of compressed air. The mind boggles on the control loops needed to get the jet and the bad grape to meet up at just the right time so that good grapes stay in the game.

6 thoughts on “Hackaday Links: November 24, 2024

    1. Good question. I certainly don’t know but you could see toward the end that despite the video’s assertion of a “perfect” result, there were plenty of stems still in the final product. Regardless, it’s still a very nice machine with fascinating process control strategies.

    2. For home wine making we use a thing called a crusher-destemmer. It’s like a big trough with an auger thing and all the stems and stuff sort of end up at one end. But in the frame grab it looks like whole grapes so I guess the industrial process is different. My guess is manual labor. Hand picked grapes.

      1. My friends elder brother was camped out on the bbs from his ZX81 at 300 baud in the early 80s.
        Downloading games and chatting. We thought he was pretty cool..
        Their dad freaked when the phone bill for the month was double their bill for the entire year before!
        Fun times..!

  1. Thx, Dan, for the trip down BBS Memory Lane again. I’d never want to go back to those update speeds, BUT it was a fun time. I think that was partly due to the “newness” of every advance back then. When BBS’s first came out, the ability to connect to others, get information online, play simple games against others online and all from your own home was nothing short of amazing.

    I remember in the very early 90’s playing in an online end-of-year RISK tournament. It was the 12 monthly champions all pitted against each other to crown the city’s RISK champion! The BBS was so busy that you could only get in around 2-3AM in the morning. So I volunteered to take the middle of the night bottle feeding of our newborn at 2AM each night. I held him and the bottle in my left arm and took all my RISK turns in the tournament with my right arm/hand. I came in 3rd in the tournament but found out the top 2 were actually married and were cheating to help each other out. At work, they all thought I was tired just because we had a newborn at home. :-)

    Ahhhh … good times!

  2. That grape sorter is neat. I like that it does the sorting in mid-air, as the grapes follow a predictable parabola, rather than trying to deal with them rolling and bouncing on a conveyor.

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