gdey027T91 176*264 4 grays

• Size: 176 * 264 2.7"
• Buffer size: 5808 bytes (2x additional buffers in 4 gray mode)
• Controller: SSD1680 (Solomon)
• Status: Working
• Partial update: Works great
• Gray mode: Works (Needs more testing)
• Proof-of-concept video
• RES value: 4.7 Ω

Buy this 2.7" epaper here

Tech specs

IC Driver SSD1680 (pdf)

Additional information about 2.7 inch for models with touch display

One option is to use the DESPI-V3 small PCB adapter from Goodisplay. But be aware that is only for touch or for SPI. Not for both! SPI interface with touch specifications A better option is just to get a 6 wire FPC adapter to pins and wire it yourself.

If you want to use the touch function please use the class: goodisplay/touch/gdey027T91T.h

Implementation example

Without touch:

#include "goodisplay/gdey027T91.h"
EpdSpi io;
Gdey027T91 display(io);

void app_main() {
  display.init();
  display.setMonoMode(true);       // Use monochorome mode
  display.print("Hello black");
  display.update();

  display.setMonoMode(false);      // Use 4 gray mode (Which uses 2 different buffers)
  display.setCursor(10,20);        // Move text cursor to x:10 y:20
  display.setTextColor(EPD_LGRAY); // Tint color to Light gray
  display.print("Hello GRAY");
  display.update();

  // Now if you want to switch to mono mode again, that layer has still the old buffer, so doing this:
  display.setMonoMode(true);       // Switch to mono again which uses mono buffer that is still there
  display.update();                // Should print again "Hello black"
}

With touch:

#include "goodisplay/touch/gdey027T91T.h"

// INTGPIO is touch interrupt, goes low when it detects a touch, which coordinates are read by I2C
FT6X36 ts(CONFIG_TOUCH_INT);
EpdSpi io;
Gdey027T91T display(io, ts);

// Touch event: As a demo prints x & y coordinates via Serial output
void touchEvent(TPoint p, TEvent e)
{
    printf("X: %d Y: %d Ev:%d\n", p.x, p.y, int(e));
}

void app_main(void)
{
   printf("CalEPD version: %s\n", CALEPD_VERSION);
   // Test Epd class
   display.init(false);

   // Draw your UX here (Buttons, etc)
   
   // Register the function that is triggered when there is a touch event   
   display.registerTouchHandler(touchEvent);
  
   // Loop or launch this in a FreeRTOS task:
   for (;;) {
     display.touchLoop();
   }
}