I have a product with a similar set of sensors - you might want to check it out, maybe do some reverse engineering
I don't use it for any automation, but simple monitoring and tracking. It was designed for monitoring Servers and server rooms. I'm sure with the right knowledge it could run an automated system.
The module I have is called a weatherduck, from
IT WatchDogs, Inc. Home of the Weather Duck, Weather Goose and Power Egg