The two OLED demo of yours worked very well with my new ESP8266 development board design housed in an a standard Arduino acrylic case.With regards to the two 0.96" SSD1306 OLED modules, one jumper SMD resistor on the rear of the PCB needs to be moved to position 0x7A (8 bit) (0x3D 7 bit) for this to definitely work for I2C Select address,otherwise when purchased they are by usually by default both set at 0x3C for the I2C bus address.
The two OLED demo of yours worked very well with my new ESP8266 development board design housed in an a standard Arduino acrylic case.With regards to the two 0.96" SSD1306 OLED modules, one jumper SMD resistor on the rear of the PCB needs to be moved to position 0x7A (8 bit) (0x3D 7 bit) for this to definitely work for I2C Select address,otherwise when purchased they are by usually by default both set at 0x3C for the I2C bus address.