I.7. I2C Port
I2C port X1 is designed primarily for 4 pin I2C OLED display, which can be connected directly to the port (see Figure 5). Beside interfacing with the display, I2C port can used to expand the controls and LED indicators as well. As the result, you can implement almost unlimited number of control knobs, switches, buttons, and indicator LEDs through I2C controllers (implemented with small and cheap microcontrollers for example).