[HN Gopher] Lorapaper: A connected e-paper device that runs on l...
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Lorapaper: A connected e-paper device that runs on light
Author : goodburb
Score : 120 points
Date : 2023-09-02 23:42 UTC (23 hours ago)
(HTM) web link (github.com)
(TXT) w3m dump (github.com)
| polygamous_bat wrote:
| Quick question: where are people sourcing their e paper displays?
| Everytime I think of picking some up I always feel either I'm
| paying too much or getting too little guarantees.
| jareklupinski wrote:
| personally, Digikey/Mouser if I'm scoping and need to know a
| specific stock count ahead of time, paying the premium for some
| future-proofing makes sense to me in that regard
|
| for prototypes/one-offs, aliexpress or ebay are fun if you ever
| only need one (haven't had a DOA yet), and if you email the
| company directly they may get back with their 'secret menu'
| amelius wrote:
| https://www.panelook.com
|
| Hint: click Application, then e-books.
| the__alchemist wrote:
| The sort used in this article is likely AliExpress or AliBaba.
| gotschi wrote:
| i already made a paper display using a wemos pico (has battery,
| charging and indicator) but this is very cool!
|
| have to charge mine every few months but also display a lot more
| information
| flopriore wrote:
| Do you have any blog post, video or anything that shows how to
| build your project?
| gotschi wrote:
| unfortunately no, but hardware wise a exact copy of this:
| https://github.com/lmarzen/esp32-weather-epd
|
| except for the wemos lolin c3 pico, very tiny esp
| edvinbesic wrote:
| I have a couple of lolin boads as well I am using for
| development. The firebeetle board that is linked is hands
| down the best esp32 board due to the voltage regulator.
|
| In hibernation with only the RTC clock running I believe it
| only consumes 0.008mA which is coin cell worthy with a < 1%
| duty cycle. With the wemos boards my lowest is around 3-4mA
| which is still fine but considering price is the same I
| would recommend the firebeetle ones.
| gotschi wrote:
| oh, and the data i display on mine gets fetched from my
| homeassistant
| rexreed wrote:
| Maybe I'm out of the loop but I never heard of the term energy-
| autark. Having looked up the definition, it means self-
| sufficient. Is there a reason for the use of the term autark?
| dividedbyzero wrote:
| Probably a German word that snuck in (the author appears to be
| from Germany), autark would be one of the intuitive terms in
| that language.
| olive-n wrote:
| Autark might be a more common word in another language the
| author speaks.
|
| It's a well defined word. Nothing wrong with using it.
| uxp100 wrote:
| https://github.com/RobPo/PaperiNode/tree/master
|
| This project by the same author appears to be the same but newer?
| konschubert wrote:
| Neat! Does it really not have any battery at all?
|
| I would suspect that adding a battery would allow to support
| higher current spikes, which might enable it to drive a bigger
| display.
| uxp100 wrote:
| It has a supercap and a 2032. Look at the AEM10941.
|
| According to the schematic at at least. There is something that
| kinda looks like a battery in the images.
| chmod775 wrote:
| Just a capacitor should do for that purpose?
|
| Also since this is e-paper, maybe you can just update the
| display incrementally.
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(page generated 2023-09-03 23:02 UTC)