Datasheet

Finally, connect the pins to your Arduino

GND goes to ground

Vin goes to 5V

Data to I2C SDA (on the Uno, this is A4 on the Mega it is 20 and on the Leonardo digital 2)

Clk to I2C SCL (on the Uno, this is A5 on the Mega it is 21 and on the Leonardo digital 3)

RST to digital 4 (you can change this pin in the code, later)

This matches the example code we have written. Once you get this working, you can try a different Reset pin (you

can't change the SDA and SCL pins).

Finally you can run the File→Sketchbook→Libraries→Adafruit_SSD1306→SSD1306_128x64_i2c example

Using with SPI

The breakouts are ready for SPI by default, but if you used them for I2C at some point, you'll need to remove the

solder jumpers. Use wick or a solder sucker to make sure both are clear!