My-ssd1306 board should be put between the RS232 source and the I2C SSD1306 target. Two series of connection pins are provided both have VCC, GND, SDA and SCL but one serie has the VCC and GND swapped to allows a direct connection via a connector because some commercial displays have these two pins inverted.
my-ssd1306 an HTML interface to SSD1306 OLED display – [Link]
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