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These displays are small, only about 1" diameter, but very readable due to the high contrast of an OLED display.
This display is made of 128x64 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the display has such high contrast; we really like this miniature display for its crispness!
This breakout can be used with either an SPI or I2C interface - selectable by soldering two jumpers on the back. The design is completely 5V-ready, with an onboard regulator and built in boost converter. It's easier than ever to connect directly to your 3V or 5V microcontroller without needing any kind of level shifter!
TheRaspberryPiGuy has done an *excellent* video on getting this display running with your Pi.
Guy Carpenter has a guide for using OLEDs like this one with the Raspberry Pi it's well worth a read!
Using this display with a Raspberry Pi? Check out Adafruit's SSD1306 OLED display guide.
Adafruit have provided a detailed tutorial and example code in the form of an Arduino library for text and graphics. You'll need a microcontroller with more than 1K of RAM since the display must be buffered.
On the Raspberry Pi, Adafruit now have a Python library available that works with these displays in both i2c and SPI mode.
You can download the Adafruit SSD1306 OLED display Arduino library from github which comes with example code. The library can print text, bitmaps, pixels, rectangles, circles and lines. It uses 1K of RAM since it needs to buffer the entire display but its very fast! The code is simple to adapt to any other microcontroller.