We've already learned how to work with ReSpeaker and develop programs for it. We also can develop a smart speaker machine. You can see our scenario in the following diagram:
You can see that the ReSpeaker core board connects to lamps. You can see simple a LED (DC) or lamp (AC) with a relay module.
If you use the Microsoft Bing Speech API, you can develop a smart speaker machine for recognizing some phrases such as turn on and turn off. After you obtain the text, you can parse it to determine whether it contains turn on or turn off. This is a basic smart speaker machine. You can customize it based on your use case. For instance, you build an automation system with Arduino/Raspberry Pi. Then, ReSpeaker will be used as speech input. If person says specific word, ReSpeaker will send command to Arduino/Raspberry Pi to perform something...