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ESP8266 NodeMCU Relay Module - Control AC Appliances (Web Server

ESP8266 WiFi relay switch (Arduino IDE)

ESP8266 NodeMCU Relay Module - Control AC Appliances (Web Server

ESP8266 WiFi 5V 1 Channel Relay Delay Module IoT Smart Home - Hackster.io

Esp8266 Relay Schematic

Esp8266 Relay Module Schematic

ESP8266 - Relay | ESP8266 Tutorial