ESP8266 Posted on October 3, 2021June 12, 2023 by superuser Source: https://www.mischianti.org/2021/05/08/esp12-esp07-esp8266-flash-pinout-specs-and-arduino-ide-configuration-6/ External antenna: https://www.instructables.com/External-Antenna-for-ESP8266/ ESP8266 pinout: https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/