Adafruit eInk Feather Friend with 32KB
SRAM
PRODUCT ID: 4446
Easy e-paper finally comes to your Feather with this Adafruit EInk Feather
Friend that's designed to make it a breeze to add an eInk display. Chances are
you've seen one of those new-fangled 'e-readers' like the Kindle or Nook. They
have gigantic electronic paper 'static' displays - that means the image stays on
the display even when power is completely disconnected. The image is also high
contrast and very daylight readable. It really does look just like printed paper!
We've liked these displays for a long time, and we've got Arduino/CircuitPython
drivers for all of our Feathers, so wouldn't an e-paper Feather Friend make a ton
of sense? Luckily for us, just about every small-medium size EInk display made
these days has a standard 24-pin connection. This Friend will add all the power
supply support circuitry and level shifting so you can attach your favorite display
(up to tri-color 4.2") and wire it up to your favorite development board.
Using our CircuitPython or Arduino libraries, you can create a 'frame buffer' with
what pixels you want to have activated and then write that out to the display.
Most simple breakouts leave it at that. But...just about all EInk displays are
write-only and many only let you update the full display (not partial update).
That means you have to buffer the full image you want to display, taking up
precious RAM.
The Eink Feather Friend is much friendlier - it comes with 256 Kilobit (32
Kilobyte) SRAM chip. That means you can control up to a 4.2" 300x400 tri-color
display (300*400 * 2 colors / 8 bits-per-byte = 30KB). This chip shares the SPI
port the eInk display uses, so you only need one extra pin. And, no more framebuffering! You can use the SRAM to set up whatever you want to display, then
shuffle data from SRAM to eInk when you're ready. The library we wrote does all
the work for you, you can just interface with it as if it were an Adafruit_GFX
compatible display. If you prefer not to use the chip, our libraries will
automatically use the microcontroller/microcomputer internal RAM.
We even tossed on a MicroSD socket so you can store images, text files,
whatever you like to display. Comes assembled and tested, with some header.
You'll need a soldering iron to attach the header for installing onto your Feather.
Stacking headers will let you put another FeatherWing on top.
Does not come with an EInk display or extension cable! For use with just about
any EInk display that has a 24-pin FPC connector. See these schematics to verify
that your display matches before purchasing.
https://cdn‐learn.adafruit.com/assets/assets/000/057/645/original/adafruit_products_schem.png
https://cdn‐learn.adafruit.com/assets/assets/000/057/645/original/adafruit_products_schem.png
https://www.adafruit.com/product/4446/12‐20‐19
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