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dandelany

5,264 karma · joined July 17, 2008

developer at NASA/JPL, formerly Spotify, Seed Scientific, Enigma, Turntable.FM. http://www.cognitiveharmony.net
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dandelany··on Adafruit interviews Siemens re SupplyFrame, the future of Hackaday, Tindie
Just guessing, but something like:

1. Network - just as you describe. Freemium/ad revenue. Low $/High volume

2. Platform - sell data derived from Network to manufacturers, eg. “Part X is increasingly popular and likely to go out of stock” or “part Y is a popular alternative to X”. Medium $/medium volume

3. Send them your BOM and pay consultancy rates and they’ll use 1 & 2 to make direct recommendations like “you’ll save 4 cents by replacing X with Y and reduce risk by sourcing Y from supplier Z”. High $/high touch/lower volume but they’re probably killing it right now in this arena during the chip shortage.

dandelany··on USB-C is about to go from 100W to 240W, enough to power beefier laptops
...it doesn't hurt. Dry skin isn't conductive enough to pass any significant current at 12V. But if you inserted electrodes into your fingers so the electricity conducted through your wet inner bits, you can be killed by a lot less than 12V across the heart.
dandelany··on China lands rover on Mars
No it’s not - aeolian processes do a fine job of weathering it. It is very fine dust, and somewhat toxic, but it is not sharp like lunar regolith is. https://medium.com/@adammann930/the-problem-with-dust-on-the...
dandelany··on Out-of-control Chinese rocket expected to fall to Earth in the coming days
I suspect the closest American mindset is something like “They’re not paying me enough to worry about that” or “that’s outta my pay grade”. When we choose Chinese companies that optimize for price above all else, fixing problems that crop up completely destroys their profit margin, so it’s unsurprising that they often don’t bother.
dandelany··on Mars Ingenuity helicopter mission extended by NASA
There really isn’t enough of an atmosphere to present a risk of blowing Ingenuity away, or even toppling it over - same thing with depositing enough material to bury it. More likely it could be covered in a thin film of dust that would render the solar panel nearly useless, like what happened to Opportunity.
dandelany··on Exploiting vulnerabilities in Cellebrite UFED and Physical Analyzer
> is Cellebrite capable of copying locked devices, or more to the point - has vulnerabilities to unlock devices without knowing the access PIN?

Yes, they even brag about it in their marketing materials: https://www.cellebrite.com/en/a-practical-guide-to-checkm8/

That's a public vunerability, it's anyone's guess how many nonpublic ones they're using.

dandelany··on Missing hiker found after man using computer at home pinpoints his location
Actually, I believe that's Ben Kuo, the person named in the article who identified the location originally, recreating his own work.
dandelany··on Show HN: Brushless Motor Simulator
I don't care what anyone says, I love the skeuomorphic look - knobs, buttons, toggles, even the subtle CRT glow on the scopes. Not everything needs to be clean & minimalist. Great work :)
dandelany··on Raspberry Pi 400 – CyberDeck Project
Ok, but the product is called “Adafruit CYBERDECK HAT for Raspberry Pi 400”. It’s not really muddying the waters to call it “cyberdeck” for short when you’re writing an article about it...
dandelany··on Watchy: Hackable $50 Smartwatch
The screen supports incremental updates which are pretty fast, so you don't get the full flash refresh every minute. But yeah, it's not "video" fast, it's still the same old e-ink technology with all its pros and cons - you still have to do full screen updates sometimes.
dandelany··on Watchy: Hackable $50 Smartwatch
ESP's only a power hog when it's using the WiFi... In deep sleep it can go as low as 10 uA! .15mA gets you the low-power processor for doing sensor interrupts.

In reality Watchy currently draws around 1mA while sleeping and 55 hours of battery for me, not using WiFi (not really a priority for me).. I think that can be improved with firmware updates, seems like there is potentially some low-hanging fruit. It's all open source firmware, so you can eg. program it to deep sleep while you deep sleep to save battery :)

dandelany··on Watchy: Hackable $50 Smartwatch
The link isn't loading for me, but I'm assuming that's a TTGO. Also a cool device & a good choice too, but as others mentioned Watchy has placed a high priority on docs, community, and open source - TTGO is more like "here's some hardware good luck". Plus, the e-ink screen just speaks to me :)
dandelany··on Watchy: Hackable $50 Smartwatch
It's not curmudgeonly to not be interested. But I'm always surprised when people feel the need to comment about their disinterest, and more surprised when such comments do well. Going to, say, a rock-climbing thread and commenting about how I have zero interest in rock-climbing would be a bit curmudgeonly tbh :)

Your Raspberry Pi will be e-waste in 30 years too...

dandelany··on Watchy: Hackable $50 Smartwatch
There is also a new Watchy community on Discord here: https://discord.gg/uKcfZZa2

For those considering purchasing - as a Watchy owner - if you're looking for a polished smartwatch product that you can put on your wrist and not think about how it works - this isn't that product. It's still rough around the edges, uploading new watchfaces takes some work, phone notifications aren't implemented yet, no case, etc.

But if you're intrigued by the idea of hacking on ESP32s, WiFi, BLE and/or e-ink, as a wearable hackable dev device, Watchy can't be beat. It's a lot of fun. Think of it as a wifi/BLE-enabled Arduino on your wrist.

dandelany··on Watchy: Hackable $50 Smartwatch
They are garden variety 3.7V 200mah 402030 pouch LiPos, which are pretty easy to find. More hardware details here: https://watchy.sqfmi.com/docs/hardware
dandelany··on Watchy: Hackable $50 Smartwatch
Photo (of mine) here: https://twitter.com/dandelany/status/1348224456640974850

Just measured it at 9.3mm thickness with the battery - but it has no case.

dandelany··on Watchy: Hackable $50 Smartwatch
I have one... The battery life is currently OK but not great - something like 55 hours. But I think this can be improved with some firmware changes - and the firmware is open source.
dandelany··on 31.2˝ Color EPaper Display
Power isn’t the main issue I’d be concerned about re: “lifespan” for signage. I wonder more about how it handles long-term UV exposure, day-night temperature cycles, changing humidity, etc.
dandelany··on Uniwidth Typefaces for Interface Design
It’s literally the 3rd and 4th paragraphs, in bold, with examples.
dandelany··on The Hyperbezier Pen Tool
This is a great idea, I always struggle getting Bezier points to look natural. Will definitely play more with this, looking forward to the future posts!
dandelany··on Suspicions grow that nanoparticles in Pfizer vaccine trigger allergic reactions
Hi Jacques, I’ve been reading your excellent comments for a long time. Sorry to hear you had such a painful experience with COVID. Hope you’re back to 100% soon.
dandelany··on Far Cry: How the Fire Burns and Spreads (2012)
Heh, it does this already. Your aiming precision goes way down as the weed starts to burn :-P
dandelany··on From LEGOs to Ziploc: The Science of the Snap Fit
Surely it’s not just to “feel rugged”. The rubber seal of a cooler lid is essentially a deformable spring which must be compressed in order to form an effective seal.
dandelany··on Rock Pi X: An x86 Computer in Raspberry Pi Form Factor
Dunno if there’s one compatible with the Pi X model yet, but they do make a “SATA Hat” for the RockPi 4 that you can attach to the GPIO pins to add SATA ports: https://www.seeedstudio.com/Penta-SATA-HAT-for-Rock-Pi-4-p-4...
dandelany··on Loss of smell could be a 'highly reliable indicator' of Covid-19, research says
Exactly. Losing your sense of smell is a strange and specific enough thing that, in this study, 80% of the people who volunteered because they noticed a loss of smell tested positive for COVID. But that doesn't mean 80% of people with COVID lose their sense of smell - other studies report "that the incidence rate of olfactory dysfunction in COVID-19 patients varies from 33.9–68%".

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7265845/

dandelany··on Phosphine detected in the atmosphere of Venus – an indicator of possible life?
FYI - this story was supposed to be embargoed and only a few sources are leaking details. So tune in tomorrow (presumably) for some better sources! https://twitter.com/starstoofondly/status/130532585089260339...
dandelany··on Cloth masks do protect the wearer
/shrug It’s self-censorship. Publications commonly unpublish bad articles for a wide variety of reasons. Should one not supervise one’s own conduct and morals?
dandelany··on Cloth masks do protect the wearer
It's obviously hard to critique a study that hasn't been released, but I [again] find it bizarre how the "introduction" and "conclusions" in the abstract you linked seem to be asking two separate questions.

The intro says "This trial investigates whether the use of face masks in the community will reduce wearers' risk of SARS-CoV-2 infection." (emph. mine) ie. if everyone wears masks, does my risk go down? This seems like the correct question to ask. But then the conclusion says "We will study whether a face mask protects the wearer of the mask against SARS-CoV-2 infection" which is a different question entirely!

If what we have been hearing over the past months is true (masks provide marginal protection for the wearer, but catch a significant portion of aerosol droplets & therefore protect society against the wearer) - I would expect the answer to the first question to be "yes" and the second to be "no"!

dandelany··on Cloth masks do protect the wearer
The original paper was asking the question: Do surgical masks provide adequate protection against disease transmission for dentists and patients in a clinical context? And their conclusion was: no.

This is an entirely separate question from: Do masks provide enough protection against disease transmission to be worth wearing/recommending in public places during a global pandemic, despite their imperfections? The answer to that, from many other studies, seems to be clearly yes. I can imagine that anti-mask folks started using this article as ammunition, due to the catchy headline ("see, this article says face masks don't work!"), and the publishers felt it was doing more harm than good and took it down for that reason.

dandelany··on Drug cartel assassinates its enemies with bomb-toting drones
I'm not sure, tbh, though I suspect it's due somewhat to the general technical incompetence of (terrorist & gang) organizations. Bright people aren't exactly attracted to the idea of joining an organization which doesn't value life highly, and the bright ones that do enlist may be likely to be conscripted to work on other projects or killed by enemies/rivals. It's doable by hobbyists, but doing it with the scale/accuracy needed to be dangerous is a complicated endeavour that doesn't lend itself well to this kind of organization.
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