ESP8266 pinout reference and how to use GPIO pins
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File:ESP8266 01 PinOut.png - Wikipedia
ESP8266 Relay (active low): how to prevent triggering on boot or reset (SOLVED) - ESPHome - Home Assistant Community
ESP8266 Pinout Reference: Which GPIO pins should you use? | Random Nerd Tutorials
ESP8266 NodeMCU pinout for Arduino IDE - Mechatronics Blog
have a question about pins : r/esp8266
