Some time back, Google has released couple of kits that allow you to experiment with AI (AIY – Artifical Intelligence Yourself).
One of them is the Google AIY Voice kit.
The kit contains a Raspberry Pi Zero, a speaker, a custom AIY Voice board and some extra stuff.
You can find a clear step-by-step manual online. Before you know it, you have assembled your custom Google Home speaker.
Finally, you install the necessary software, and you are ready to go.
I also recommend to configure the auto-launch feature. This is decribed as part of the extra features in the manual.
A small remark: the “OK Google” function doesn’t work with the Pi Zero that’s included. Apparently, it isn’t powerful enough. This means that you always have to push the button before giving a command.
If you really want the “OK Google” part, then you have to replace by Pi Zero with the more powerful Raspberry Pi 3.
Check these blog posts for extra Raspberry Pi projects:
Geek stuff 
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