Pinout Diagrams

ESP32

ESP32 DEVKIT V1 DOIT board with 36 pins Pinout
https://randomnerdtutorials.com/esp32-pinout-reference-gpios/

ESP8266

ESP8266 12-E NodeMCU Kit pinout diagram gpios pins
https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/
WeMos D1 Mini Pinout diagram gpios pins
https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/