Adafruit_SSD1306 library ported for Spark by Paul Kourany, Mar 18, 2014

SSD1306 128x64 Wiring guide

// If using software SPI (the default case):
#define OLED_MOSI   D0
#define OLED_CLK    D1
#define OLED_DC     D2
#define OLED_CS     D3
#define OLED_RESET  D4
Adafruit_SSD1306 display(OLED_MOSI, OLED_CLK, OLED_DC, OLED_RESET, OLED_CS);

. . .

Update by Jeremy Ellis Feb 9th, 2016

If using the beginner-128x64-OLED-I2C.ino with the particle.io and the I2C protocol and the Grove seeedstudio 128x64 OLED

http://www.seeedstudio.com/wiki/Grove_-_OLED_Display_0.96%22#With_Arduino

you can connect all four wires to the Photon

1. black GND
2. red 3v3
3. white SDA Pin D0
4. yellow SCL Pin D1

Remember to include the following files:

1. Adafruit_GFX.cpp
2. Adafruit_GFX.h
3. Adafruit_SSD1306.cpp
4. Adafruit_SSD1306.h