Banggood Dear customer, Thanks for choosing Banggood and sorry for your any inconvenience came up with the product. We are very sorry for that inconvenience.  Here is the attached photo about the  schematic. You can refer to it and then solve your problem.   If you need any supports, please contact us:http://www.banggood.com/Contact-Us_hi111. We will help you solve the problem as soon as possible. Best regards, Banggood Team

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holla2040 "The pinout above is incorrect, here's the correct one, http://esp32.net/images/Heltec/WIFI-Kit-32/Heltec_WIFI-Kit-32_DiagramPinout.jpg"

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holla2040 Here are my notes about this boardhttps://github.com/Heltec-Aaron-Lee/WiFi_Kit_serieshttps://eyun.baidu.com/s/3hsiTNggblue led on 2look at libraries/OLED/examples/SSD1306UiDemo/oled is sim to adafruit 938, ssd1306 128x64, SSD1306 display(0x3c, 4, 15);//OLED pins to ESP32 GPIOs via this connecthin://OLED_SDA -- GPIO4//OLED_SCL -- GPIO15//OLED_RST -- GPIO16Hope this helps, I did recompile the demo software and learned a lot this board from the github project above.

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