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Getting the OLED work is a bit tricky, especially for beginners i think. The BoobieTrap here is that you have set Pin16 (OLED_RST) to High or you will see nothing on your display.
Took me a few hours to trick this out :)

just add following lines to your setup loop

pinMode(16,OUTPUT);
digitalWrite(16, LOW); // set GPIO16 low to reset OLED
delay(50);
digitalWrite(16, HIGH); // while OLED is running, must set GPIO16 to high

and, if needed, edit your Wire.begin() to Wire.begin(4,15); (4 = SDA 15 SCL)

i tested it with the Adafruit SSD1306 and the Acrobotics SSD1306 Librarys
both work.

Display size is 128x64
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Pin Out
https://cdn.hackaday.io/files/269911154782944/Heltec_WIFI-LoRa-32_DiagramPinout.jpg
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Framework source
https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series
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윈도우 설치 및 사용 가이드
https://github.com/Heltec-Aaron-Lee/WiFi_Kit_series/blob/master/InstallGuide/windows.md
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simple examples
https://robotzero.one/heltec-wifi-lora-32/
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Big ESP32 + SX127x topic part 2
https://www.thethingsnetwork.org/forum/t/big-esp32-sx127x-topic-part-2/11973
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Arduino LMIC (LoraMAC-in-C) library
https://github.com/matthijskooijman/arduino-lmic

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