The Driver chip of this OLED is SSD1306, which is compatible with IIC or SPI communication. So this module can be controlled by SPI or I2C. There are 2 resistors at the back of the module and sick-screen to remind you how to set the communication mode, the default mode is 4-wires SPI mode. That is, except the VCC and GND, 4 wires would be needed when using 4-wires SPI mode. You can also set to the I2C mode, in which mode 2 control wires is needed. There is also a simple switch-cap charge pump that turns 5v into a high voltage drive for the OLEDs, making this module the easiest ways to get an OLED into your project.
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