[HN Gopher] 4.2'' and 7.5'' NFC-powered e-Paper Displays Work wi...
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4.2'' and 7.5'' NFC-powered e-Paper Displays Work without Battery
Author : homarp
Score : 543 points
Date : 2020-03-17 13:22 UTC (9 hours ago)
(HTM) web link (www.cnx-software.com)
(TXT) w3m dump (www.cnx-software.com)
| 0xff00ffee wrote:
| I'm really impressed they've got current requirements down to the
| level where NFC can power the refresh. Geometry has to be the
| next step. When eInk busted out of MIT in the late 90's, they
| kept revisiting flexible formats without too much luck. I hope
| the flexible screen folks are cross pollenating with the eInk
| brains. In this example, even though the display is small, the
| electronics around it are very bulky.
| hadlock wrote:
| Would be interesting for use on a boat. Generally you want a fast
| refresh rate but once a minute would be fast enough for most
| users. The problem with navigation displays on boat are
|
| 1. daytime visibility 2. long term waterproofing in a saltwater
| environment
|
| With this setup you could mount a raspberry pi W on one side of
| the fiberglass to interpet NEMA 2000/0183 data and the NFC chip,
| and the waterproof, hermetically sealed e-ink display on the
| other, held on with velcro or neodymium magnets etc.
| yingw787 wrote:
| Wow, this looks wonderful! It reminds me of my old solar-powered
| Casio calculator. I have a Boogie Board already, but I can see
| how computer access can change the game (accurate drawings, NFC
| to save, etc.). Hope to see these guys around more!
| eyegor wrote:
| This could be great for a calendar or schedule at work, network a
| bunch together and push updates whenever needed. Or acting as a
| live sign for reserving conference rooms, allow people to reserve
| on a web portal or at the sign.
| solarkraft wrote:
| Just a tad too slow to be a cool e-reader.
| ddevault wrote:
| If this can be made thin and small enough, it'd be cool to use it
| to put your remaining balance and perhaps recent transactions on
| transit cards.
| jv22222 wrote:
| Let's talk that through a bit more.
|
| I wonder if it could be used to create one-off cryptographic
| notes - that, when used (scanned), are somehow deleted and can
| never be used again.
|
| Can't think of a way off the top of my head, but I wonder.
| slfnflctd wrote:
| If the encryption is strong enough, you could assign a subset
| of predetermined keys to each card issued-- but you still
| need a robust server/network to verify the transaction ACID-
| style & invalidate the key (or part of the subset?) at the
| end while retaining the rollback ability until that final
| invalidation is verified.
|
| Tricky business, for sure. Seems theoretically plausible, but
| I'm sure there are many things I haven't thought of.
| arkh wrote:
| https://www.gemalto.com/financial/cards/payments/dynamic-
| cod...
|
| Already used to make dynamic CVV codes for cards which change
| every 30 minutes.
| jv22222 wrote:
| That's cool
| fit2rule wrote:
| Awesome! I'll be getting a couple of these for my sound studio ..
| these are the ideal things to use to put up the daily recording
| schedule/sessions, plus "RECORDING - QUIET PLEASE" type signs.
|
| I've wanted to put an e-ink display up on the door for a while,
| but always stumbled when it came to actually routing power to the
| door - but this just elegantly solves the problem completely.
| kohtatsu wrote:
| Clicking "Read More" on the cookie banner sends you to Google for
| "How to remove cookies."
|
| No, I want to set a cookie to tell y'all not to set tracking
| cookies and just limit it to strictly necessary ones.
|
| I can remove them and their server will go ahead and set them
| again.
|
| And no, sending me to a property owned by one of the worst
| offenders in this space is not what I want.
| DubiousPusher wrote:
| Very cool. I love ideas that seem super obvious after you hear of
| them.
| timw4mail wrote:
| These look similar to the ePaper price tags I've seen starting to
| pop up
| remcob wrote:
| I wonder if the same app will allow updating those.
| fraidy-cat wrote:
| I would hope that electronic price tags make use of some sort
| of authentication in order to set the price that they
| display.
|
| In Norway, where I live, big retailers will often allow you
| to pay the price that is shown on the shelf even if their
| cash register is returning a different, higher price.
|
| I have personally experienced a difference between shelf
| price and cash register price a few times, and in all of the
| cases where this happened at a big retailer they allowed me
| to pay the shelf price.
|
| I actually thought that they were required to do this by law,
| but looking into it now I find that it is only a
| recommendation that they do so and not something that they
| are required to do by law.
|
| The Norwegian Consumer Ombudsman (the government-appointed
| ombudsman in Norway for consumer affairs [1]) has an article
| on their website about this topic [2]. Translated from
| Norwegian, here is an exceprept of what they say:
|
| > * Do you have the right to buy the item at the price at
| which the item was marked? The Marketing Act does not grant
| such rights, and it is disputed to the extent that one has a
| legal right on other grounds to demand the purchase of the
| item at the shelf price.
|
| > * The stores should still allow the customer to pay a shelf
| price. It is the store that made the mistake, and it would be
| very bad service to allow for this to negatively affect the
| customer who notifies them of the error so that they can
| correct it.
|
| Anyway, as mentioned you will often be allowed to pay the
| shelf price rather than the cash register price when you're
| at one of the stores of the larger retailers. So obviously it
| would be bad for their business if someone was able to
| manipulate the price tags without them noticing it.
|
| In closing I should also note that there are probably
| limitations to how big of a difference in price that they
| would be willing to accept. In my case it has often been a
| matter of $20 in difference at most. So, don't expect that
| you would be able to pay like $99.50 for something that was
| supposed to cost $995 or anything like that, even if the
| shelf price somehow ended up showing $99.50 :P
|
| And also, any consumer that changed the price-tags of the
| things they were buying in order to con the store into
| selling it to them at a lower price would see no sympathy
| from me when they inevitably eventually got caught for doing
| so. Remember, kids: Just 'cause it's technically possible
| don't mean you are legally allowed to do it. If you notice a
| vulnerability in a system I strongly recommend that you don't
| touch it and that you at most let them know about it
| anonymously unless you have prior written consent to
| investigate and/or mess with the electronic systems that
| belong to other people, businesses or other kinds of
| entities.
|
| [1]:
| https://en.wikipedia.org/wiki/Norwegian_Consumer_Ombudsman
|
| [2]: https://www.forbrukertilsynet.no/regler-for-prismerking-
| buti...
| sschueller wrote:
| Not cheap (USD 42) but still cool [0]
|
| [0] https://www.aliexpress.com/item/4000418859190.html
| jaclaz wrote:
| It's roughly 10 US$/inch, and is not that there that many uses
| for the smaller 4.2" model, the US$ 70 for the 7" model is IMHO
| more than "not cheap", "rather expensive".
|
| I guess that for the "this week recipe" a more traditional
| printed paper remains cheaper and more practical.
|
| For "daily" or more frequent need of refresh, maybe it may
| become a valid choice.
| reaperducer wrote:
| I see at least one good use for the smaller one: Price tags
| at a supermarket.
|
| Instead of a team of clerks changing the labels for three
| hours at night, you can have one guy do the whole store in
| that time. The savings in labor would quickly make up for the
| initial expense.
| jaclaz wrote:
| Sure, but - all in all - it is not that the batteries will
| make a difference, if you have to change them - say - once
| every 1 to 5 years.
|
| Comparable "normal" e-ink labels cost much less than these
| (like 50-60%) AFAIK.
| boomlinde wrote:
| E-ink shelf labels are quite common here. NFC in that case
| seems like a much worse option than longer distance radio
| communication powered by a small battery lasting a few
| years.
|
| As the article notes, this is probably best for information
| that needs to be updated relatively infrequently, if you're
| doing it so often that labor cost is at all much of a
| concern. Updating displays one by one manually using NFC
| seems like it would be nearly as labor intensive as
| swapping paper labels.
| bleuarff wrote:
| I don't know where you live, but here in France I haven't
| seen a paper price tag for years. Every chain store has
| been using e-ink tags for a long time.
| com2kid wrote:
| Only one of the grocery stores near me uses LCD price
| tags.
|
| There is a constant hiss/buzz from the power and I
| presume they aren't OLED because I can see the
| inconsistent backlight that goes out in places along the
| strip.
|
| Feels cheap and crappy overall.
| IanCal wrote:
| Oh that's great. I wanted a nice, updatable eink screen for
| things like "this weeks recipies" and have been trying to work
| out how to drive it / power it without spending too much. A
| jailbroken kindle and a server somewhere could work nicely, but
| there's a lot to that and I don't _really_ want to spend too much
| time maintaining things.
|
| Would be interesting to know if people have got it working with
| other NFC apps / how hard it is to add to your own app.
| hirsin wrote:
| I'd be happy with just taking a screenshot of the recipe and
| scanning it on to the e-ink - this will save my phone quite a
| few run ins with oily/dirty hands while cooking.
| philips wrote:
| I think Chrome 81 has WebNFC too
| https://googlechrome.github.io/samples/web-nfc/
| vitovito wrote:
| Open source code to write the image using libnfc and node.js 8.x:
| https://gitlab.com/bettse/wne_writer
| philips wrote:
| Anyone find if the NFC protocol is documented somewhere?
| jaclaz wrote:
| >Anyone find if the NFC protocol is documented somewhere?
|
| You won't probably like this (between 100 and 600 US$ per
| document):
|
| https://nfc-forum.org/our-work/specification-releases/specif...
| philips wrote:
| Posted elsewhere on this discussion:
| https://gitlab.com/bettse/wne_writer
| jobseeker990 wrote:
| This could replace your printer really nicely. Anytime you want
| to print something out, you swipe your phone by this and use it
| instead.
|
| Any kind of reference, recipe, directions, notes. This would even
| be cool instead of a second monitor. Just to put up a reference
| page or cheat sheet.
| datashow wrote:
| But no color, and no real gray scale.
| doorbellguy wrote:
| The pricing should also play a significant role in its
| adoption. Especially if unbundled with other phones. At almost
| $42 and $70 (for the larger display) we should wait to see
| which subset of customers could justify it's use-case in daily
| life.
| p1esk wrote:
| Did you forget an extra zero or are they really this cheap?
| blisterpeanuts wrote:
| They're also for sale on Amazon for about the same prices.
| akiselev wrote:
| Yeah I had to do a double take. It's less than $80 before
| shipping.
|
| https://www.aliexpress.com/item/4000748950835.html
| z2 wrote:
| I currently do something like this with a cheap thermal
| printer. Aside from apparent environmental issues of thermal
| paper, it is really great to print out these short, portable,
| and disposable materials on a whim from my phone (Bluetooth)
| and computer (USB).
| TheSpiceIsLife wrote:
| The reactant in thermal paper is often BPA.
|
| Might pay to check yours and read the health effects section
| here https://en.wikipedia.org/wiki/Bisphenol_A
|
| Edit: fixed a word
| rtkwe wrote:
| Couldn't tell but is BPA toxic on skin contact. All the
| worry I was hearing was based on ingestion.
| saurik wrote:
| Do a Google search for "BPA toxic skin contact" (search
| terms you came up with) and be amazed at the wonder of
| modern search engines (which will return results from
| PubMed, Nature, and WebMD).
|
| (edit) There is something telling about how three people
| have now downvoted my comment for not doing the work of
| pasting the links myself, but not a single person has
| bothered to provide the links themselves, which kind of
| demonstrates the problem with these comments: the comment
| I am responding to is undermining a well-researched
| notion--one that AFAIK no one questions, and for which it
| is trivial to find numerous articles and studies: that
| BPA is absorbed through the skin from receipts--with the
| moral equivalent of "citation needed"; that comment
| asking for a reference seriously took longer to type than
| finding the relevant articles would have, and yet in
| practice is asking other people to do that work, and so
| the work doesn't get done by anyone... but the comment
| itself sits there, making people who are less informed on
| the topic question the validity, as in "I dunno, this
| comment claims they hadn't heard that, and is demanding
| citations; if it were easy to find a citation they
| wouldn't be asking that, so I guess the thing they are
| poking at isn't actually true". If you want to downvote
| my response to that behavior--which is to point out that
| a Google search would have worked--but you aren't willing
| to actually do the work of providing the links yourself
| (or at least _also_ downvoting the comment), you are just
| making yourself part of the problem of incentivizing
| leaving these misinformative comments : /.
| DenisM wrote:
| You are being downvoted for being snarky, which is
| against the HN guidelines.
| mrexroad wrote:
| I say this to be helpful, so please don't take it as an
| attack. While initial comment added no value (e.g. that
| Google exists), but what I found off-putting was your
| tone. That, coupled with the comment[0] in your profile,
| make it easy to jump to a specific conclusion, right or
| wrong, about your intent. just be mindful of perception.
| FWIW, I struggle with this daily and often wish more
| folks would point out when I'm coming across in a way I
| didn't intend.
|
| [0] "I make it something of a policy to not look at
| things people say in response until at least a month
| later."
| rahimnathwani wrote:
| The resolution is only 800x480. What reference page or cheat
| sheet would fit on that?
| pipework wrote:
| Smalltalk's syntax[0], presumably.
|
| [0]: https://medium.com/@richardeng/syntax-on-a-post-card-
| cb6d85f...
| catalogia wrote:
| I think you must be spoiled by modern high-dpi displays if
| you can't see any use for 800x480 displays. When I was in
| school I used to put cheatsheets on my TI-83+ which had a
| 96x64 monochrome display!
| anigbrowl wrote:
| Lots of useful things would fit on that, and resolution
| increases with technological refinement.
| hnlmorg wrote:
| You used to be able to stick a lot of text on a 320x200
| display when I first got into software development. :)
|
| Jokes aside, you'd probably want that 480x800 (portrait
| rather than landscape). Which would be 80 columns and 100
| rows in old 8-bit microcomputer terms. So it wouldn't be the
| more detailed of a document but it should be detailed enough
| for a cheat sheet or narrowly focused reference page. You
| probably wouldn't want much more than that anyway otherwise
| you risk your reference material to be too verbose for quick
| sanity checks.
| semi-extrinsic wrote:
| Isn't that the same as the OG Kindle? If so, you can fit
| approx half an A4 / Letter page at adequate readability.
| lukifer wrote:
| I'm always surprised that e-ink readers have such good
| readability at low resolutions. I think an accidental by-
| product of how they work is a little "fuzziness" when
| translating from digital data to analog atoms, so the text
| looks more like organic newspaper ink than a pixellated
| screen.
|
| Anyway, most e-readers are in the ballpark of 800x600; and I
| expect if the concept got traction, there's no reason it
| couldn't be scaled up to 8.5" x 11" at equivalent pixel
| densities (at the cost of hovering your phone for a few
| seconds longer or whatever).
| andai wrote:
| If you swipe _two_ phones, you can double the resolution.
| ako wrote:
| The only times i use a printer these days if someone else wants
| me to deliver something on paper, not for myself. ePaper is
| just as unacceptable as digital on phone. Last time was to have
| a paper copy of a india e-visa.
| m-p-3 wrote:
| It's nice as long as your document fits on a single page.
| Otherwise you need several of them, and it won't allow you to
| scribble on it or highlight stuff.
|
| IMO this is still less functional than an ordinary sheet of
| paper, this just solve the energy issue, but not much else.
|
| I'd still probably go with a powered one just to get the
| benefit of swapping pages and taking notes on it.
|
| On the other hand, if the can manage to make something that can
| power them over a longer distance than typical NFC, I could see
| those used for in-office digital signage (meeting room status
| and schedule, employee schedule, etc) which doesn't require a
| battery swap, PoE or some other kind of way to power it.
| arendtio wrote:
| Now I understand why the Stark Trek people used to have
| dozens of tablets ;-)
| [deleted]
| numpad0 wrote:
| These type of E Ink devices takes seconds to update
| [deleted]
| jandrese wrote:
| Refresh time is listed as 4 or 5 seconds, depending on how
| big the display is.
| codetrotter wrote:
| I don't mind. Printers often have a startup time of multiple
| minutes. And with printers we waste paper and we are required
| to refill them with ink or toner.
|
| I will gladly use this e-Paper display instead in any
| situation where I want some kind of reference sheet like the
| parent commenter said, and where the resolution is
| sufficient.
| nathancahill wrote:
| This is really excellent. Various projects I've wanted to do with
| old iPads all require a power source. Price is a little steep but
| hopefully lower in the future?
| akincisor wrote:
| It would be a good choice to replace tablets that are used
| outside conference rooms to show the schedule and/or book the
| room.
| tannerbrockwell wrote:
| I've seen companies waste some pretty serious time on admin and
| maintenance of room reservation screens by the doors. Oddly
| enough they had chose not to go with an iPad based system
| because of cost
| ForHackernews wrote:
| My university replaced some room reservation tablets with
| pieces of paper on a clipboard.
| ek750 wrote:
| what were the reasons for doing so? maintenance,
| theft/vandalism, or worse, bad software?
| ThePadawan wrote:
| My employer uses Roomz (https://roomz.io/) which does exactly
| that.
|
| It has some trade-offs like being very laggy if a meeting is
| spontaneously cancelled, and it doesn't show double bookings,
| but besides that, it's pretty attractive.
| hcs wrote:
| They're battery powered:
|
| > More than 2 years of autonomy for the ROOMZ Display and
| more than 4 years for the ROOMZ Sensors. Runs on single
| Batteries that can easily be replaced.
|
| Still, 2 years is pretty good.
| Shivetya wrote:
| getting larger and the ads displayed in store windows could
| eventually be replaced. it would be a much better way to
| display pricing and menus in restaurants than the current fad
| of large monitors.
|
| there are all sorts of places where information does not need
| real time updates that this type of technology could eventually
| satisfy. the best part is reduced energy use and even paper use
| KMnO4 wrote:
| Many of the grocery stores in my area actually use e-ink
| labels[0] on the shelves.
|
| [0]: https://www.displaydata.com/
| EvanAnderson wrote:
| If you could parasitically power the unit from Wi-Fi beacon
| frames that would be _awesome_. The idea of a sign that
| "magically" updates itself over the air gives me a giddy "I
| live in the future" feeling.
| doorbellguy wrote:
| Interesting thought. At that point (or for that fact - at
| this point) it's is essentially a reusable printable paper.
| For people arguing about the low resolution of the $70~
| model, I would not disregard their argument because we
| haven't seen it in real life and would love to see how
| documents scale up on that display.
| tracker1 wrote:
| If you aren't using super-white printer paper, not sure
| that this is any more eco friendly than printing a sheet of
| paper off twice a day, every weekday for years. Not sure
| what the materials impact is for e-ink, and paper is a
| renewable resource and sourced from trees generally grown
| specifically making paper as a crop.
| jodrellblank wrote:
| WiFi -> electric current rectennas announced a year ago[1]
| were in the range of 40 microwatts, and the blog post says
| this NFC system runs at 1.4 Watts, that feels a long way
| away. But years ago LCD calculators could run on a solar cell
| the size of a finger and powered by ambient room lighting -
| surely must be some close to crossover level available.
|
| [1] http://news.mit.edu/2019/converting-wi-fi-signals-
| electricit...
| Smoosh wrote:
| I'm wondering if that was a constant 40 microwatts, and if
| that could be stored in capacitors so that every 4-5
| seconds (the refresh rate of the panel) there would be
| enough energy accumulated to power the circuitry for an
| update.
| gtkspert wrote:
| Actually, there are units similar to this that update over
| Infrared (even non-directionally)
|
| Best Buy use them as price tags:
| https://www.youtube.com/watch?v=7aVoeDC-7MA
| zndr wrote:
| We already power our iPads via POE< which is also how you'd
| power those beacons, so it's not really a great improvement.
|
| BUT the idea that you would "tap in" to book it would be
| great.
| walterbell wrote:
| Is there a PoE to lightning adapter?
|
| edit: $28 splitter, https://www.poetexas.com/products/af-
| lightning
|
| And $100 Belkin Ethernet-PoE adapter.
| robocat wrote:
| Use a PoE to USB (female USB-A or USB-C) adapter -
| variety of models e.g. I saw one for $10 on Alibaba.
| EvanAnderson wrote:
| I'm talking about radio energy powering the device. 802.1
| beacon radio frames, which your access points send out over
| the air. Configure it via USB, etc, then just hang it on
| the wall. No cables. Just a passive device.
| solarkraft wrote:
| My employer and university have had these on conference/lefture
| rooms for years. They're ridiculously expensive from what I
| remember (700EUR for the ones at work, I think, the uni ones
| are larger and older, so probably even more expensive), but
| compared with not getting the information as easily as they
| provide it makes them worth it.
| pbhjpbhj wrote:
| $70 for the larger one, I was really surprised at the low
| cost.
| srcmap wrote:
| With such limited power budget, is there any security circuits
| for authentication and encryption?
|
| If not, it would be super easy hack.
| KMnO4 wrote:
| Even the most basic xor "encryption" would use virtually no
| power. Define a key and xor all data coming in with it. Given
| the slow refresh rate of these things, it would provide
| sufficient security against a bruteforce.
| gruturo wrote:
| Upload a file consisting of all zeroes (or any other known
| content for that matter) and now the contents of the screen
| is the secret used to XOR the input. Surely you meant
| something a bit more substantial?
| edent wrote:
| I wonder what sort of security it has? Wouldn't want anyone to be
| able to deface it.
|
| The photos make it looks like there's a micro-USB port on the
| bottom. Any idea what that's for?
| daveoc64 wrote:
| It's far better than a paper sign or label. It'd be much easier
| to just put a sticker on top of the screen if you wanted to
| deface it.
| baybal2 wrote:
| Then, just undeface it.
| edent wrote:
| Doesn't help much if the display is in a public place like a
| supermarket.
| reaperducer wrote:
| I've seen e-ink price tags in grocery stores, and it
| doesn't seem to be any more of a problem than someone
| writing over a paper price tag with a Sharpie.
| frogpelt wrote:
| But maybe more of a target?
| fit2rule wrote:
| > micro-USB port
|
| Firmware updates?
| FroshKiller wrote:
| Anyone could smash or paint over these if they really wanted to
| deface them. I'd be more concerned about subtly tampering with
| the image, e.g. changing a displayed price.
| tpolzer wrote:
| AES GCM should take insignificant amounts of power compared to
| eink panel refresh and make this secure enough (unless there's
| no way to reprogram the mcus in there?).
| peter_d_sherman wrote:
| Excerpt:
|
| "e-Paper displays have great readability under sunlight, and only
| consume power when updated. But their refresh rate is limited,
| and most displays are fairly expensive."
|
| I've been searching for a tiny computer / screen combination that
| would work under absolute minimal power; that is, if you were in
| deep space (or in the deep wilderness), and only had a small
| (say, 5W or less) solar panel for power, then what tiny computer
| / screen / keyboard combination would you use?
|
| Well, this screen seems like it might be ideally suited to be the
| screen component of a setup like that...
| brtkdotse wrote:
| I had one of these back in the mid-90s:
| https://en.m.wikipedia.org/wiki/Poqet_PC
|
| It did a lot of trickery, like suspending the CPU between
| keystrokes, to get a weeks "work" (I was 12) out of it running
| on two AA batteries.
| egd wrote:
| I'd want to check this before committing, but my understanding
| is that e-ink is cheap power-wise because it doesn't require
| power to maintain the image - actually changing the image,
| though, is more expensive than LCDs or OLEDs, so if you try to,
| say, watch a video on an e-ink screen, you're going to get
| worse energy draw than an LCD display.
| pbhjpbhj wrote:
| Also this is 0.2fps. (or 0.25fps for the smaller one).
| fit2rule wrote:
| I've had one of these for a few months, and its pretty awesome
| to be honest:
|
| https://thingpulse.com/product/espaper-plus-kit-wifi-epaper-...
| [deleted]
| robocat wrote:
| Jailbreak a kindle. They are super low power and cheap with
| lots of features - I'm guessing a 5W solar panel would be
| overkill if you only update the screen irregularly.
| solarkraft wrote:
| Came here to say this. I've been playing with doing some
| development on one, but the kernel must be really old now. Do
| you happen to know whether there's a way to update it?
| e12e wrote:
| On that note... The remarkable sipposidly allows access for
| writing software (I think their dev documentation leaves
| something to desired..). Might also be an option.
|
| Ed: https://remarkable.engineering/
| bluehavana wrote:
| Could also try a Sharp Memory LCD. Faster refresh rates and
| pretty low power consumption depending on usage pattern. Here's
| an article of someone using it with an ESP32:
| https://hackaday.com/2020/01/07/how-low-can-an-esp32-go/
| SebiH wrote:
| I wonder if you could somehow get this to work with some form of
| passive wifi, maybe slowly harvest energy from available radio
| signal to trigger a screen update. Maybe someone knows if this is
| theoretically possible?
| arendtio wrote:
| https://news.ycombinator.com/item?id=22610276
| candeira wrote:
| If I worked at Waveshare, I'd partner up with a phone case
| manufacturer and sell user-customisable phone cases.
|
| They could also offer a SDK so apps could publish high utility
| info with low update frequency on the case itself: weather,
| public transport realtime schedules, etc.
|
| (Edit: had originally written "low-latency" instead of "with low
| update frequency", because of the strong conditioning to
| associate "low latency == good")
| roywiggins wrote:
| I'd love to see something like this on hard drives, both bare
| ones and ones with enclosures.
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