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Add STEMMA version.

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# PCB for the Adafruit 128x64 I2C/SPI 1.3" OLED breakout board
<a href="http://www.adafruit.com/products/938"><img src="assets/image.jpg?raw=true" width="500px"><br/>Click here to purchase one from the Adafruit shop</a>
<a href="http://www.adafruit.com/products/938"><img src="assets/938.jpg?raw=true" width="500px"><br/>
<a href="http://www.adafruit.com/products/938"><img src="assets/image.jpg?raw=true" width="500px"><br/>
Click here to purchase one from the Adafruit shop</a>
__Format is EagleCAD schematic and board layout__
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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!
We've updated the design to add auto-reset circuitry so that the reset pin is optional. The default interface is now I2C not SPI - since it speaks I2C you can easily connect it up with just two wires (plus power and ground!). We've even included SparkFun qwiic compatible STEMMA QT connectors for the I2C bus so you don't even need to solder!
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](http://learn.adafruit.com/monochrome-oled-breakouts) 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.