Hi Evan Kinswood,
Glad you enjoyed the project! I think the best policy is to contact Google directly for any licensing concerns. Also, since the Android Things SDK is currently under developer preview, you may want to take that into consideration if you’re planning on a consumer product. If you’re offering a developer product (e.g. a DIY kit) and not redistributing the SDK, I don’t think that would be an issue.
Hope this helps!