For this display we will run a 4-level grayscale demo

Open up FileExamplesAdafruit_EPDThinkInk_gray4

Configure Pins

At the top of the sketch find the lines that look like:

#define EPD_DC      10
#define EPD_CS      9
#define SRAM_CS     6
#define EPD_RESET   8 // can set to -1 and share with microcontroller Reset!
#define EPD_BUSY    7 // can set to -1 to not use a pin (will wait a fixed delay)

Change both EPD_RESET and EPD_BUSY to -1 since neither of these lines are connected on the FeatherWing.

You'll also need to update the CS and DC pins if you're not using a Feather M0 or M4. For example, on an ESP8266

#define SRAM_CS 16
#define EPD_CS 0
#define EPD_DC 15

Configure Display Size

Find the part of the script where you can pick which display is going to be used.

For the 2.9" Grayscale Featherwing, you will need to have ThinkInk_290_Grayscale4_T5 uncommented, and any other type commented.

Fine this line and make sure it is not commented out:

// 2.9" Grayscale Featherwing or Breakout:
ThinkInk_290_Grayscale4_T5 display(EPD_DC, EPD_RESET, EPD_CS, SRAM_CS, EPD_BUSY);

Upload Sketch

Go ahead and upload the sketch to your board. Once it is done uploading, open the Serial Monitor.

The display should start running a series of monochrome and grayscale tests.

This guide was first published on Jul 18, 2018. It was last updated on Jul 18, 2018.

This page (Arduino Usage) was last updated on Apr 10, 2021.

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