4.2″ and 7.5″ NFC-powered e-Paper Displays Work without Battery
cnx-software.com
cnx-software.com
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.
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.
[0]: https://medium.com/@richardeng/syntax-on-a-post-card-cb6d85f...
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).
A Kindle Paperwhite is 1072x1448, 300 PPI, 16 levels of grayscale.
I personally couldn't tolerate reading on a kindle until they reached 212 PPI. 800x600 may be acceptable for a simple sign, but it's not gonna wow anyone.
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.
Might pay to check yours and read the health effects section here https://en.wikipedia.org/wiki/Bisphenol_A
Edit: fixed a word
(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 :/.
[0] “I make it something of a policy to not look at things people say in response until at least a month later.”
Commenting on commenting on commenting on downvotes, which you're doing, is annoying. I'm on an even number here, so I should be okay. We'll see!
Too bad. The original "invisible ink" activated by heat is lemon juice.
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.
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.
For something you can do at home, try heating the whole thing to 120C and dipping in hot glue.
BUT the idea that you would "tap in" to book it would be great.
edit: $28 splitter, https://www.poetexas.com/products/af-lightning
And $100 Belkin Ethernet-PoE adapter.
[1] http://news.mit.edu/2019/converting-wi-fi-signals-electricit...
Best Buy use them as price tags: https://www.youtube.com/watch?v=7aVoeDC-7MA
At least with the paper-on-clipboard, it's obvious if an existing meeting was crossed out.
If not, it would be super easy hack.
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
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.
> 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.
https://m.aliexpress.com/wholesale/ED060KC1.html?keywords=ED...
"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...
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.
https://thingpulse.com/product/espaper-plus-kit-wifi-epaper-...
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.
Tricky business, for sure. Seems theoretically plausible, but I'm sure there are many things I haven't thought of.
Already used to make dynamic CVV codes for cards which change every 30 minutes.
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")
I've always been highly annoyed that I cannot set the screensaver on my Kindle to "the last page I read". Then I would set it to things like my itinerary when I travel, to an editor cheat sheet when I'm learning an editor, etc.
That said, IF the board firmware was open, you could probably get it to speak NDEF if you were willing...
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.
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 $99.50 :P
And also, any consumer that changed the price-tags of the things they were buying in order to con the store into selling it to them at a lower price would see no sympathy from me when they inevitably eventually got caught for doing so. Remember, kids: Just 'cause it's technically possible don't mean you are legally allowed to do it. If you notice a vulnerability in a system I strongly recommend that you don't touch it and that you at most let them know about it anonymously unless you have prior written consent to investigate and/or mess with the electronic systems that belong to other people, businesses or other kinds of entities.
[1]: https://en.wikipedia.org/wiki/Norwegian_Consumer_Ombudsman
[2]: https://www.forbrukertilsynet.no/regler-for-prismerking-buti...
Would be interesting to know if people have got it working with other NFC apps / how hard it is to add to your own app.
I've wanted to put an e-ink display up on the door for a while, but always stumbled when it came to actually routing power to the door - but this just elegantly solves the problem completely.
The photos make it looks like there's a micro-USB port on the bottom. Any idea what that's for?
Firmware updates?
You won't probably like this (between 100 and 600 US$ per document):
https://nfc-forum.org/our-work/specification-releases/specif...
Dude is some anime fan and boss told him to make a video demonstrating photos so why not take a pic of his anime figure? You're overreacting to say the least.
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.
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.
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.
Comparable "normal" e-ink labels cost much less than these (like 50-60%) AFAIK.
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.