ePaper.js
Hardware
e-paper display control
SHOW HN2020
How HN took it
1 positive, 6 neutral or asking, 0 mixed, 0 critical, out of 7 comments about the project. Thread score +0.07.
Design: 1 for, 0 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Looks cool and promising
From 1 comment
Looks very cool and promising. I'm wondering what's the power draw for the Pi with this one since it "Loads index.html in a headless instance of Chromium, using Puppeteer". Isn't…
sdfhbdf on HN
Objections
Puppeteer/Chromium may be too power hungry for battery use
From 2 comments
Looks very cool and promising. I'm wondering what's the power draw for the Pi with this one since it "Loads index.html in a headless instance of Chromium, using Puppeteer". Isn't…
sdfhbdf on HNQuick idea: even though Chromium (not Puppeteer) is quite power hungry, you only need to run it once every update period and then take a archive/dump of the output that gets fed…
capableweb on HN
Requests
Support partial refresh to avoid ghosting
From 2 comments
The problem with e-ink is that redrawing pixels without cycling leads to ghosting after a few draws. Most displays automatically cycles the entire screen now and then to mitigate…
mekkkkkk on HNThe Waveshare displays do support partial refresh, but I haven't had time to look into exposing it into Node, yet.
robocollab on HN
Lower power operation, e.g. start and stop Chromium per update
From 2 comments
Quick idea: even though Chromium (not Puppeteer) is quite power hungry, you only need to run it once every update period and then take a archive/dump of the output that gets fed…
capableweb on HNIt would be pretty easy to modify the chain of command to have the backend start and stop the Chromium process. I haven't taken any detailed measurements, yet, but I'm guessing…
robocollab on HN
Questions
What is the power draw on a Raspberry Pi?
From 1 comment
Looks very cool and promising. I'm wondering what's the power draw for the Pi with this one since it "Loads index.html in a headless instance of Chromium, using Puppeteer". Isn't…
sdfhbdf on HN
Why do some screen updates need a full inversion while others change trivially?
From 1 comment
When using my reader, sometimes mutations require a full screen invert. Sometimes stuff just seems to change trivially. What governs that? Is that done by the display or driver…
Waterluvian on HN
Alternatives named
Pi Zero with a LiPo battery daily news display
From 1 comment
I built something that's similar to what you're describing, here's an article about it: https://www.hackster.io/lukehaas/e-ink-display-for-daily-news-weather-and-more-3dd7b1 It…
lukehaas on HN
ESP8266 with canvas-mocked graphics library
From 1 comment
I have used an low-power ESP8266 together with a native drawing library for this use case. As getting the drawing perfect is quite cumbersome i have mocked the graphics library…
gregod on HN
KOReader on Kindle
From 1 comment
Application driven. KOReader (which I use on my Kindle) lets you even configure this to every X pages.
captn3m0 on HN