Datasheet

You will see the display flash a bunch and then a set of

black and red lines will appear like shown on the left.

If you see the lines, your wiring is good! If not, go back

and check your wiring to make sure its correct. If you

didn't use the default pins, change them in the sketch

Load Graphics Test Demo

Open up File→Examples→Adafruit_EPD→graphicstest and upload to your microcontroller wired up to the display

If you're using a FeatherWing, use the pin definitions from the top of FeatherWingTest, for example:

#ifdef ESP8266

#define SD_CS 2

#define SRAM_CS 16

#define EPD_CS 0

#define EPD_DC 15

#endif

and copy those into the top of the graphics test sketch