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

Nodemcu-esp8266 Wifi controlled motor, solenoid, valve, switch, relay etc

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ESP8266-12F Relay Board - A2D Electronics

ESP8266 Relay Board - EasyEDA

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

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