4 ms·

I did NOT expect this to be under US$100. Definitely going for low power with SPI interface, but I don't get their refresh claim. SPI tops out around 1MB/s... 6

I did NOT expect this to be under US$100. Definitely going for low power with SPI interface, but I don't get their refresh claim. SPI tops out around 1MB/s... 600x448x7 is ~235KB or 4 fps at 1MBps... but 15fps? That'd be 7MB/s, which is nigh impossible on SPI. EDIT: 15 SECONDS PER FRAME, not 15fps. Thanks everyone for pointing that out. Still, amazingly cheap ... and almost no standby current after programming.

marcinzm 6y ago
I read the spec (column "FULL REFRESH TIME (S)") as saying 15 seconds per refresh not 15 refreshes per second. So 4 frames per minute which falls well within your calculation. edit: Fixed to be 4 frames per minute not 4 frames per second.
- blacksmith_tb 6y ago
  Wouldn't that be 4fpm (frames per minute)? Which is no problem for signage, but not really practical as a secondary display...
  - marcinzm 6y ago
    Yes, my bad, it'd be 4 frames per minute.
tqi 6y ago
I think its actually 15 seconds per frame, not frames per second
deleted 6y ago
[deleted]
fulafel 6y ago
It's seven color, not 7-bit. Also there might be just a "set color" command followed by 1-bit pixel data instead of a 4-bit pixel representation, or something.
- Coffeewine 6y ago
  I have a three color model from waveshare, and the way it works for it is you have to send a black and white bitmap, followed by a color and white bitmap. It's possible for these guys you need to repeat that five times.
LeifCarrotson 6y ago
> FULL REFRESH TIME 15s That's 15 seconds per frame, or 0.067 fps. That refresh rate is fine if you're using it to show the price of a rack of clothing, or various sensors - but you're not going to get smooth-scrolling text with it. The low-power interface is for those same battery-backed retail signage applications, where you're driving this, the microcontroller, and the wireless receiver with 3.7v from a coin cell. Glad to see these becoming available for consumers and hackers! They've been hard to come by for years.
- JKCalhoun 6y ago
  Or a "magic mirror" showing weather, calendar, time: you know, hours and minutes only :).
  - SahAssar 6y ago
    "Magic mirrors" don't work with e-ink since they require a lit display to shine through the mirror.
    - JKCalhoun 6y ago
      Good point. I suppose it just becomes a display then, rather than mirror — but with similar data. More like the ubiquitous readouts in the "2001" Discovery ship.

marcinzm 6y ago

I read the spec (column "FULL REFRESH TIME (S)") as saying 15 seconds per refresh not 15 refreshes per second. So 4 frames per minute which falls well within your calculation. edit: Fixed to be 4 frames per minute not 4 frames per second.

blacksmith_tb 6y ago
Wouldn't that be 4fpm (frames per minute)? Which is no problem for signage, but not really practical as a secondary display...
- marcinzm 6y ago
  Yes, my bad, it'd be 4 frames per minute.

tqi 6y ago

I think its actually 15 seconds per frame, not frames per second

deleted 6y ago

[deleted]

fulafel 6y ago

It's seven color, not 7-bit. Also there might be just a "set color" command followed by 1-bit pixel data instead of a 4-bit pixel representation, or something.

Coffeewine 6y ago
I have a three color model from waveshare, and the way it works for it is you have to send a black and white bitmap, followed by a color and white bitmap. It's possible for these guys you need to repeat that five times.

LeifCarrotson 6y ago

> FULL REFRESH TIME 15s That's 15 seconds per frame, or 0.067 fps. That refresh rate is fine if you're using it to show the price of a rack of clothing, or various sensors - but you're not going to get smooth-scrolling text with it. The low-power interface is for those same battery-backed retail signage applications, where you're driving this, the microcontroller, and the wireless receiver with 3.7v from a coin cell. Glad to see these becoming available for consumers and hackers! They've been hard to come by for years.

JKCalhoun 6y ago
Or a "magic mirror" showing weather, calendar, time: you know, hours and minutes only :).
- SahAssar 6y ago
  "Magic mirrors" don't work with e-ink since they require a lit display to shine through the mirror.
  - JKCalhoun 6y ago
    Good point. I suppose it just becomes a display then, rather than mirror — but with similar data. More like the ubiquitous readouts in the "2001" Discovery ship.