The main use case for this Feather is to use with e-Ink displays. Adafruit sells many different eInk displays in the shop. In the example below, you'll use the 2.13" Tri-Color eInk display. However, you'll be able to use this Feather with any compatible 24-pin eInk display.
Easy e-paper finally comes to microcontrollers, with this breakout that's designed to make it a breeze to add a tri-color eInk display. Chances are you've seen one of those...
$19.95
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Open the 24-pin connector on the Feather. Slot the display ribbon connector into the connector on the Feather with its pins facing up.
Arduino Library
To use the display, you will need to install the Adafruit_EPD library (code on our GitHub repository). It is available from the Arduino library manager so we recommend using that.
From the IDE open up the library manager...
Click the Manage Libraries ... menu item, search for Adafruit EPD, and select the Adafruit EPD library:
If asked about dependencies, click "Install all".
If the "Dependencies" window does not come up, then you already have the dependencies installed.
If the dependencies are already installed, you must make sure you update them through the Arduino Library Manager before loading the example!
/***************************************************
Adafruit invests time and resources providing this open source code,
please support Adafruit and open-source hardware by purchasing
products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries.
MIT license, all text above must be included in any redistribution
****************************************************/
#include "Adafruit_ThinkInk.h"
#ifdef ARDUINO_ADAFRUIT_FEATHER_RP2040_THINKINK // detects if compiling for
// Feather RP2040 ThinkInk
#define EPD_DC PIN_EPD_DC // ThinkInk 24-pin connector DC
#define EPD_CS PIN_EPD_CS // ThinkInk 24-pin connector CS
#define EPD_BUSY PIN_EPD_BUSY // ThinkInk 24-pin connector Busy
#define SRAM_CS -1 // use onboard RAM
#define EPD_RESET PIN_EPD_RESET // ThinkInk 24-pin connector Reset
#define EPD_SPI &SPI1 // secondary SPI for ThinkInk
#else
#define EPD_DC 10
#define EPD_CS 9
#define EPD_BUSY 7 // can set to -1 to not use a pin (will wait a fixed delay)
#define SRAM_CS 6
#define EPD_RESET 8 // can set to -1 and share with microcontroller Reset!
#define EPD_SPI &SPI // primary SPI
#endif
// 1.54" 152x152 Tricolor EPD with ILI0373 chipset
// ThinkInk_154_Tricolor_Z17 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 1.54" 152x152 Tricolor EPD with SSD1680 chipset
// ThinkInk_154_Tricolor_RW display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 1.54" 200x200 Tricolor EPD with SSD1681 chipset
// ThinkInk_154_Tricolor_Z90 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 2.13" Tricolor EPD with SSD1680 chipset
ThinkInk_213_Tricolor_RW display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY,
EPD_SPI);
// 2.13" Tricolor EPD with IL0373 chipset
// ThinkInk_213_Tricolor_Z16 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 2.7" Tricolor Featherwing or Breakout with IL91874 chipset
// ThinkInk_270_Tricolor_C44 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 2.7" Tricolor Featherwing or Breakout with EK79686 chipset
// ThinkInk_270_Tricolor_Z70 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 2.9" Tricolor Featherwing or Breakout with IL0373 chipset
// ThinkInk_290_Tricolor_Z10 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 2.9" Tricolor Featherwing or Breakout with UC8151D chipset
// ThinkInk_290_Tricolor_Z13 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// 2.9" Tricolor Featherwing or Breakout with SSD1680 chipset and negative
// offset
// ThinkInk_290_Tricolor_Z94 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI);
// ThinkInk_420_Tricolor_RW display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS,
// EPD_BUSY, EPD_SPI); ThinkInk_420_Tricolor_Z21 display(EPD_DC, EPD_RESET,
// EPD_CS, SRAM_CS, EPD_BUSY, EPD_SPI);
void setup() {
Serial.begin(115200);
while (!Serial) {
delay(10);
}
Serial.println("Adafruit EPD full update test in red/black/white");
display.begin(THINKINK_TRICOLOR);
}
void loop() {
Serial.println("Banner demo");
display.clearBuffer();
display.setTextSize(3);
display.setCursor((display.width() - 144) / 2, (display.height() - 24) / 2);
display.setTextColor(EPD_BLACK);
display.print("Tri");
display.setTextColor(EPD_RED);
display.print("Color");
display.display();
delay(15000);
Serial.println("Color rectangle demo");
display.clearBuffer();
display.fillRect(display.width() / 3, 0, display.width() / 3,
display.height(), EPD_BLACK);
display.fillRect((display.width() * 2) / 3, 0, display.width() / 3,
display.height(), EPD_RED);
display.display();
delay(15000);
Serial.println("Text demo");
// large block of text
display.clearBuffer();
display.setTextSize(1);
testdrawtext(
"Lorem ipsum dolor sit amet, consectetur adipiscing elit. Curabitur "
"adipiscing ante sed nibh tincidunt feugiat. Maecenas enim massa, "
"fringilla sed malesuada et, malesuada sit amet turpis. Sed porttitor "
"neque ut ante pretium vitae malesuada nunc bibendum. Nullam aliquet "
"ultrices massa eu hendrerit. Ut sed nisi lorem. In vestibulum purus a "
"tortor imperdiet posuere. ",
EPD_BLACK);
display.display();
delay(15000);
display.clearBuffer();
for (int16_t i = 0; i < display.width(); i += 4) {
display.drawLine(0, 0, i, display.height() - 1, EPD_BLACK);
}
for (int16_t i = 0; i < display.height(); i += 4) {
display.drawLine(display.width() - 1, 0, 0, i, EPD_RED);
}
display.display();
delay(15000);
}
void testdrawtext(const char *text, uint16_t color) {
display.setCursor(0, 0);
display.setTextColor(color);
display.setTextWrap(true);
display.print(text);
}
Upload the sketch to your board and open up the Serial Monitor (Tools -> Serial Monitor) at 115200 baud. As the various display demos refresh the screen, their titles will be shown in the Serial Monitor.
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