Tech Note 068 - Arduino IDE how to Determine, Add and Change Pin Mapping
Confused about Arduinio, ESP8266 and ESP32 pin maps on development boards, here's how to find out what those pin labels mean and how they are mapped to GPIO pins. Also I show how to add your own pin definitions and change pins.
Pin-mapping: https://github.com/esp8266/Arduino/tr...
Arduinio:
ArduinoIDE\libraries\Firmata\Boards.h