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Relay Tutorial for Arduino, ESP8266 and ESP32

Right PIN to activate a wireless relay with ESP8266 ESP-01 - Arduino

ESP8266 Relay Board - EasyEDA

MicroPython: Relay Module with ESP32/ESP8266 (Guide + Web Server

esp8266_relay_board_sch – Martin's corner on the web

ESP8266 Relay Board with ESP-01S Serial WIFI Wireless Transceiver

ESP8266-12F Relay Board - A2D Electronics