It could be modified pretty easily to do other things. You could pretty easily combine it with my
differential temperature controller to do what you'd like to do.
I've wanted to do something similar too. I have 13 windows in my sunroom. That means 13 blinds to deal with. I close them and open them almost every day in winter. Its kind of a pain with furniture and other things in the way. I'd like to put a photoresistor or two out and have that automatically control the opening and closing of the blinds. However, I'd need 13 actuators to control the blinds and that would just be a big ol pain to make so I haven't done anything yet.