These displays are small, only about 1.3" diagonal, 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!
The driver chip, SSD1306 can communicate in two ways: I2C or SPI.
The OLED itself require a 3.3V power supply and 3.3V logic levels for
communication, but we include a 3.3V regulator and all pins are fully
level shifted so you can use with 5V devices!
The power requirements depend a little on how much of the display is lit
but on average the display uses about 40mA 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.
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 1K
of RAM since the display must be buffered. 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.