The Oled display (AZDelivery 1x 0,96 Zoll OLED Display - I2C SSD1306 Chip 128 x 64 Pixel I2C) is connected to the second Arduino SDA to pin 13 and SCL to pin 11 I will make a better description in the ...

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7. Click upload and you are all set. A so-called garbage OLED is not really garbage after all. The HelTec OLED that I got has 128×64 pixels, which is not much, but you can actually play chess on it.