{"product_id":"adafruit-eink-breakout-friend-with-32kb-sram","title":"Adafruit eInk Breakout Friend with 32KB SRAM","description":"\u003cp\u003eAdd some bi-stability to your life with an \u003cstrong\u003eAdafruit EInk Breakout Friend\u003c\/strong\u003e - your fun pal who's happy to lend a hand when you want to work with EInk\/E-Paper displays.\u003c\/p\u003e\n\u003cp\u003eLuckily for us, just about every small-medium size EInk display made these days has a standard 24-pin connection. This breakout 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 favourite development board.\u003c\/p\u003e\n\u003cp\u003eUsing the 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 Friend is much friendlier - 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 Adafruit wrote does all the work for you\u003c\/a\u003e\u003c\/strong\u003e\u003ca href=\"https:\/\/github.com\/adafruit\/Adafruit_EPD\" rel=\"noopener noreferrer\" target=\"_blank\"\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\u003eFor ultra-low power usages, the onboard 3.3V regulator has the Enable pin brought out so you can shut down the power to the SRAM and display. By default the RESE resistor is set to 0.5 ohms, which is the most common value, but by cutting\/soldering the bottom solder jumper you can set the resistor to 3 ohms.\u003c\/p\u003e\n\u003cp\u003eComes assembled and tested, with some header. You'll need a soldering iron to attach the header for breadboarding or installing into your project. \u003cstrong\u003eDoes not come with an EInk display! \u003c\/strong\u003eFor 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\u003cstrong\u003eRevision History:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eAs of November 2022\u003c\/b\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 PCB or the older version with vector fonts - both are identical other than the fancy silkscreen.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eProduct Dimensions: 34.7mm x 21.5mm x 3.5mm \/ 1.4\" x 0.8\" x 0.1\"\u003c\/p\u003e\n\u003cp\u003eProduct Weight: 3.4g \/ 0.1oz\u003c\/p\u003e\n\u003cp\u003e\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 \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\u003c\/p\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 What's the deal with all of these eInk displays?\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/learn.adafruit.com\/products\/4224\/guides\" rel=\"noopener\" target=\"_blank\"\u003eSee All Guides\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Adafruit","offers":[{"title":"Default Title","offer_id":27842420506707,"sku":"ADA4224","price":8.95,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/4224-08.jpg?v=1555417044","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/adafruit-eink-breakout-friend-with-32kb-sram","provider":"Pimoroni Ltd","version":"1.0","type":"link"}