SHC with OLED 0.9" no display


 

Hi guys.. was adding OLED 0.96" SSD1306"  display was not light up, but the ESP32S is able to upload code and it also have red light ones ST4 was plug in to Onstep. any idea what missing...

//define Display_OLED  SSD1306
//define SERIAL_INTERFAE  SerialST4
//define SERIAL_BUD_DEFAULT 9600

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