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Alexandros Marinos Profile picture
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29 Jun, 17 tweets, 6 min read
Widespread daisy-chaining will change hardware forever. Most peripherals connect back to a mainboard that must know the number of peripherals in advance, and everything must travel back all the way. Daisychaining fixes that.

🧵of daisychainable protocols:
Quick review in case you think daisy-chain is something to do with flowers: The daisychaining pattern is to connect many devices together not by connecting each to a central hub, but by connecting each to the previous one, somewhat like the links in a chain.
First and foremost: power. This one is easy, but also easy to forget. You can power any number of devices in the same line. So long as they use the same voltage, and you have enough amperage, daisychaining power is the way to go. What for you ask? I'm glad you did.
i2c is the obvious well-known example. Many sensors and actuators availabe on the market. Low-speed and short-distance? i2c is probably what you need. (or with HS I2C, go up to 3.4mb/s) i2c-bus.org
Before we move on, the qwiic system deserves a mention: it streamlines i2c and power into a simple, daisy-chainable connector, with quite a few peripherals available by SparkFun: sparkfun.com/qwiic
Many people don't know that SPI has a daisy-chainable mode: maximintegrated.com/en/design/tech…
The automotive world of course knows all this, because it's wired everything up through CAN bus. en.wikipedia.org/wiki/CAN_bus
Ok fine, that's all well and good, but did you know Thunderbolt is daisy-chainable?

(if you heard that USB4 will include thunderbolt, that's true, but not the daisychaining part AFAICT 😡) anandtech.com/show/10248/thu…
Allright, you're hip with the wires, you knew all of that. But did you know you can daisychain Ethernet?

Check mate, mate!

dxu3qlulsm4jd.cloudfront.net/sites/www.volt…
I think the musicians in the group will stab me if I don't mention MIDI. An incredible invention that is behind synthesizers everywhere, and so much more: en.wikipedia.org/wiki/MIDI
What about storage? Have no fear, SCSI, and also FireWire(!) have got your back:

en.wikipedia.org/wiki/SCSI
smallbusiness.chron.com/connect-multip…
z
The dream, however, still unfulfilled: daisy-chainable USB without extra components. Until then, we'll have to make do with some nifty setups that hide a hub inside the connector: wired.com/2010/07/daisy-…
That said, I'm getting a bit of inspiration with all these protocols in one place: Could we bootstrap USB into becoming daisychainable by passing an i2c bus through the "alt" wires of the usb-c connector, so that the master can tell peripherals if they should be on or off?
In other news, the debugging standard JTAG apparently is all over daisychaining. No idea what this is for, maybe something cool? en.wikipedia.org/wiki/JTAG
Honorable mention: m5stack, because it looks super cool, and is all about chainin' daisies, I mean modules: m5stack.com
What am I missing? Any other protocols you know of? I'm investigating this for some next-gen balena hardware stuff, so your assistance may end up making a difference. Thanks!

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More from @alexandrosM

Alexandros Marinos Profile picture
1 Jul
I was holding off on doing a🧵on Dr. Maxmen, as she seemed to back off after trying to gaslight everyone into doubting their own eyes. Given her self-admitted memory issues, I'd expect far more caution. Instead, she's back to bullying, and the memory issues are worse than ever.
On the memory issues, here's a thread describing the incident, and her response underneath. Of course as the person replying to her says, the photo should have jogged her memory before the accused others of doctoring.

Now for those technical pieces.
Here is Dr. Maxmen bullying @R_H_Ebright, among many other honors, recipient of the "American Society for Biochemistry and Molecular Biology/Schering-Plough Research Achievement Award" by calling him a "chemist": twitter.com/search?q=chemi…
Read 19 tweets
Alexandros Marinos Profile picture
29 Jun
I want to write a few things about Dr. W. Ian Lipkin or as we call him in my household, *Dr Lynchpin*. He is the in the middle of many networks in virology, but at the same time he is somewhat of a maverick. Plays the game, but eventually finds his way to doing the right thing.🧵
Lipkin, early in the pandemic, was *everywhere*. Just between Jan 20 and Jan 30, he was quoted on 18 different articles, some times 3 articles in the same day! This continued up until March, when the infamous "The Proximal Origin of SARS-CoV-2" came out, with him as one author.
Lipkin was one of the few that George Gao, the head of the Chinese CDC, called on New Year's Eve 2020 to give him the down-low on the new virus. He also is one of only two scientists to claim he knew something was up before the last days of December 2019:
Read 21 tweets
Alexandros Marinos Profile picture
29 Jun
... aaaaand @ComicDaveSmith jumps the shark. Dave, you're doing great with your work with Mises caucus. And in principle objections to lockdowns are understandable. But *do not* tell people the delta variant is not more dangerous. At the very least the science is not clear yet.
If your philosophy is that lockdowns or restrictions are unacceptable that's totally up to you, or if it's that the government can't be trusted to implement them, again fine. It's irresponsible to say the data is somehow exaggerated. We don't yet know, it's too new.
Protect your reputation, we need voices that are sane and not be tarred with strong positions that are risky to take unless you really know what you are talking about. The doctors I watch are very concerned, and trust me they are not in Fauci's pocket, so it doesn't seem as clear
Read 7 tweets
Alexandros Marinos Profile picture
28 Jun
Do we have examples where a paradigm shift in a field came from the core members / inner circle of the field itself?
Semelweis' Germ theory came from an "assistant" doctor at a hospital in Vienna. The field rejected his findings (and the implication that they were at fault) so strongly that his mental health broke down and he died in an asylum at 47. explorable.com/semmelweis-ger… Image
Plate tectonics took 45 years to be properly accepted, being highly contentious much of the time in between 1915 and 1960 - visionlearning.com/en/library/Ear…
Read 4 tweets
Alexandros Marinos Profile picture
28 Jun
Fascinating interview, mostly because Anderson contradicts things we know for a fact from the researchers in WIV themselves.
Principally, she insists work was done in BSL-4, when in fact Shi Zhengli has clearly said the work was being done in BSL-2 and BSL-3. Who do we believe? sciencemag.org/sites/default/…
Anderson: “If people were sick, I assume that I would have been sick—and I wasn’t,” she said. “I was tested for coronavirus in Singapore before I was vaccinated, and had never had it.”
Koopmans: nbcnews.com/nightly-news/v…
Read 13 tweets
Alexandros Marinos Profile picture
27 Jun
After digging into December 2019 COVID-19 events, a significant cluster of... shadows relating to September and October 2019 emerged. This is the thread in which we'll gather everything unusual from August 2019 to mid-December 2019, just so we've got a net wide enough.
This is a refinement of the thread here , focusing mostly on conversation with @tehknein @lab_leak @scotub.
One odd pattern is reports from athletes who participated in the World Military Games in Wuhan in Oct 2019 and reported Covid-like illnesses:
Read 47 tweets

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