This isn't a plug-in, but rather an explanation on how to wire up and then (more importantly) set up an ambient sensor.
Post's attachments
Ambient Level Guide.npa
78.98 kb, 1053 downloads since 2012-12-17

Hi Scott,
Thanks for posting this, the more things like this we can put up here to help people make the best use of our systems the better. As its not a plug-in its better located in the Hints/Tips section I think so I have moved it.
Best Regards,
Rachael

Good Stuff. Very useful!