“You can easily control light, fan, and other home appliances with the voice commands using the NodeMCU and Relay module.
In this IoT project, I have made the Alexa Smart Home Automation system using the NodeMCU ESP8266 & Relay Module. You can easily control light, fan, and other home appliances with the voice command. To connect the Echo Dot smart speaker with the NodeMCU, I have used only the Amazon Alexa app.
If you don’t have Echo Dot smart speaker, still you can control the home appliances. And you can also monitor the relay time feedback of the switches from the smartphone.
You can also use the ESP32 board instead of the NodeMCU microcontroller.”