These displays are small, only about 1" diagonal, but very readable due
to the high contrast of an OLED display. This display is made of 128x32
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!
The driver chip SSD1306, communicates via I2C only
. 3 pins are required to communicate with the chip in the OLED display, two of which are I2C data/clock pins.
The OLED and driver require a 3.3V power supply and 3.3V logic levels
for communication. To make it easier for our customers to use, we've
added a 3.3v regulator and level shifter on board! This makes it
compatible with any 5V microcontroller, such as the Arduino.
The power requirements depend a little on how much of the display is lit
but on average the display uses about 20mA from the 3.3V supply. Built
into the OLED driver is a simple switch-cap charge pump that turns
3.3v-5v into a high voltage drive for the OLEDs, making it one of the
easiest ways to get an OLED into your project!
Of course, we wouldn't leave you with a datasheet and a "good luck": We have 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 512 bytes of RAM since the display must be buffered.
You can download our 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 512 bytes of RAM since it
needs to buffer the entire display but its very fast! The code is
simple to adapt to any other microcontroller.