Circuit Diagram: Relay module: Connect the IN pin of the relay to a GPIO pin (e.g., D1 or GPIO5). ESP8266 or ESP32: Make sure the relay module's VCC and GND are properly connected to the board.

ESP8266 Smart Plug – Arduino Code Download Those who have the Wi-Fi shield can simply plug in your modules together as shown above and connect it to your computer to begin programming our ESP8266 ...

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