{"product_id":"adafruit-eink-feather-friend-with-32kb-sram","title":"Adafruit eInk Feather Friend with 32KB SRAM","description":"\u003cp\u003eEasy e-paper finally comes to your Feather with this \u003cstrong\u003eAdafruit EInk Feather Friend\u003c\/strong\u003e that's designed to make it a breeze to add an eInk display.\u003c\/p\u003e\n\u003cp\u003eChances 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!\u003c\/p\u003e\n\u003cp\u003eWe've liked these displays for a long time, and there are Arduino\/CircuitPython drivers for all 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.\u003c\/p\u003e\n\u003cp\u003eUsing 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.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eThe Eink Feather Friend is much \u003c\/strong\u003e\u003cstrong\u003efriendlier - it comes with  256 Kilobit (32 Kilobyte) SRAM chip. \u003c\/strong\u003eThat 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 frame-buffering! \u003cstrong\u003eYou can use the SRAM to set up whatever you want to display, then shuffle data from SRAM to eInk when you're ready. \u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_EPD\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eThe library does all the work for you\u003c\/a\u003e\u003c\/strong\u003e\u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_EPD\"\u003e, you can just interface with it as if it were an Adafruit_GFX compatible display\u003c\/a\u003e. If you prefer not to use the chip, the libraries will automatically use the microcontroller\/microcomputer internal RAM.\u003c\/p\u003e\n\u003cp\u003eAdafruit 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.\u003c\/p\u003e\n\u003cp\u003e\u003cmeta charset=\"utf-8\"\u003e\u003cstrong\u003eDoes not come with an EInk display or extension cable!\u003c\/strong\u003e For use with just about any EInk display that has a 24-pin FPC connector. \u003ca href=\"https:\/\/learn.adafruit.com\/assets\/57645\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eSee these schematics to verify that your display matches before purchasing\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch2\u003eTechnical Details\u003c\/h2\u003e\n\u003cp\u003e\u003cb\u003eRevision History:\u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eAs of October 2022\u003c\/b\u003e\u003cspan\u003e \u003c\/span\u003e– we've updated this PCB with \u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_Pinguin\"\u003eAdafruit Pinguin\u003c\/a\u003e to make a lovely and legible silkscreen - you may get the new black PCB or the older blue PCB version with vector fonts, they are functionally the same\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2011_65_EU.svg\" alt=\"RoHS 2 2011 65 EU Compliant\" width=\"145\" height=\"80\"\u003e\n\u003cimg src=\"https:\/\/www.adafruit.com\/includes\/templates\/shop2019\/images\/RoHS2_2015_863_EU.svg\" alt=\"RoHS 2 2015 863 EU Compliant\" width=\"145\" height=\"80\"\u003e\n\u003ch2\u003eLearn\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/learn.adafruit.com\/bare-e-ink-displays-crash-course\"\u003eBare E-Ink Displays Crash Course\u003c\/a\u003e\n\u003cdiv class=\"product-learn-guide-tagline\"\u003eWhat's the deal with all of these eInk displays?\u003c\/div\u003e\n\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/products\/4446\/guides\" target=\"_blank\" rel=\"noopener\"\u003eSee All Guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":31268612046931,"sku":"ADA4446","price":8.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/files\/4446-06.jpg?v=1787231001","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-eink-feather-friend-with-32kb-sram","provider":"Pimoroni Ltd","version":"1.0","type":"link"}