TTGO ESP32 + OLED + battery

SSD1306 

Can program 1 extra LED (connected to GPIO16 [D0])

https://www.aliexpress.com/item/33012516518.html?spm=a2g0s.9042311.0.0.27424c4diD5s1j

{{:esp32:pasted:20191020-181002.png}}

 OLED
Unlike on other ESP32 boards with OLEDs, the OLED's I2C SDA and SCL pins are connected as follows:

SCL - Pin 4
SDA - Pin 5

{{:esp32:pasted:20191020-182306.png}}