Can I use one sharing key with more than one feed?

No, one sharing key can only be used with one feed at a time. If you want to share data from more feeds, then you need to register more sharing keys. 

Do note that you can register up to 3 keys under the same account yourself. If you need more keys then you can contact us and provide us with the following info for creating more keys for you.

1. email address
2. coordinates in decimal format.

You can of course use the same sharing key if you are redoing your setup or setting up a new Pi while the previous one, for which it was registered, is no longer operational.