Waveshare 2.42-inch OLED Module, embedded SSD1309 driver

Using Arduino Displays
1

Hi everyone, i have a Waveshare 2.42-inch OLED module with an embedded SSD1309 driver:

The OLED module provides two types of driver interfaces: 4-wire SPI(default) and I2C interfaces. There are two optional solder resistors on the back of the module. I would like to use the I2C interface.

In there Wiki they write: "There are two optional solder resistors on the back of the module in the bottom left corner". > Lower left corner ?

2.42inch_OLED_Module_hardware
2.42inch_OLED_Module_hardware1334×878 230 KB

Looking at the picture I would say the upper left corner is meant, right? Also there are Resistors in lower left Corner. As I am now unsure which one I should re-solder, does anyone have experience with the display or can give me some advice? RED or GREEN? Or both?

They also write the following in the wiki:

"The module assumes a 4-wire SPI communication mode by default, i.e. the resistor is connected to the SPI by default. The specific hardware configuration is as follows:
4-wire SPI:
This is the factory demo setting: two 0R resistors are connected to the SPI position; DIN is connected to the host MOSI and CLK is connected to the host SCLK.
I2C:
Two 0R resistors are connected to the I2C position; DIN is connected to the host SDA and CLK is connected to the host SCL.
The DC pin can be used to change the I2C address: When set low, the I2C address is :0x3C; when set high, the I2C address is 0x3D."

Many thanks in advance

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To switch to I2C mode you have to "move" the R's in the red circle (or remove them and make a bridge with a drop of tin)

pp2

or

pp3

3

thanks a lot! :+1:
I just wasn't quite sure, but i wanted to avoid unnecessary soldering. but i had already suspected that. I just think they worded it a bit unfavorably.

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