TinyOLED - Simple DIY Display Controller

As I usually print directly from the PC, I do not really depend on having a display controller attached to my Prusa i3. However I do like to have a display, because it is quite convenient to be able to control the printer off-line, to adjust the print rate while printing, or just to check the temperatures while cooling down after the PC has already been switched off.

The often used 2004 smart and the full graphics display controllers are rather large, they occupy with their two 10-pin cables a lot of the unused pins (especially on Sanguinulolu, which only has a few of those) and their backlight LEDs draw quite a lot of current from the 5V supply.

So when I first saw one of these tiny OLED 128x64 I2C displays, I thought that these were just what I needed to build a a simple DIY display controller: it is much smaller, uses less pins and draws less current and - since it also works on 3.3V! - it can also be used with the Arduino Due. The result is the tinyOLED display contr