I'm have the same OLED display and am having trouble running the Adafruit example code as well. I am using an Arduino Mega 2560.
The SPI pins for the Mega are: 50 (MISO), 51 (MOSI), 52 (SCK), 53 (SS)
The SPI pins for the Nano are: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK)
So OLED
pin 9 (D1) goes to pin 51
pin 10 (D0) goes to pin 52
pin 15 (CS) goes to pin 53
pin 14 (RES) goes to reset pin by 3.3V pin
pin 13 (DC) goes where?
I am new to all of this and can't seem to figure out how to get this to work. Any help would be much appreciated!
Thanks