The OLED does not display unless the following modifications are done:
C:\Users{user}\AppData\Local\Arduino15\packages\Heltec-esp32\hardware\esp32\0.0.8\libraries\DISPLAY\src\HT_st7735.h
/ Redefine if necessary /
define ST7735_CS_Pin 38
define ST7735_REST_Pin 39
define ST7735_DC_Pin 40
define ST7735_SCLK_Pin 41
define ST7735_MOSI_Pin 42
define ST7735_LED_K_Pin 21
define ST7735_VTFT_CTRL_Pin -1
C:\Users{user}\AppData\Local\Arduino15\packages\Heltec-esp32\hardware\esp32\0.0.8\variants\wireless_track\pins_arduino.h
Line 74 should read as follows:
The OLED does not display unless the following modifications are done:
C:\Users{user}\AppData\Local\Arduino15\packages\Heltec-esp32\hardware\esp32\0.0.8\libraries\DISPLAY\src\HT_st7735.h / Redefine if necessary /
define ST7735_CS_Pin 38
define ST7735_REST_Pin 39
define ST7735_DC_Pin 40
define ST7735_SCLK_Pin 41
define ST7735_MOSI_Pin 42
define ST7735_LED_K_Pin 21
define ST7735_VTFT_CTRL_Pin -1
C:\Users{user}\AppData\Local\Arduino15\packages\Heltec-esp32\hardware\esp32\0.0.8\variants\wireless_track\pins_arduino.h Line 74 should read as follows:
static const uint8_t Vext = 3;