Hand up, talk to your machine. Asking her "what time is it?", "playing a sound" or connect to other device to control it.
Amazon provide an amazing intelligent voice cloud service. Alexa Voices Service.
There is the introduction.
Using USB video camera to detect the hand gesture for triggering the voice recording.
The gesture lib is using openCV.
In this project, you can learn setup webcam, USB sound card
Before the implement, please setup your Alexa account from AWS.
Setup the rep list
Download the code from github.....
Entering the ID you register from Alexa
I will update the audio ALSA configure part.