You might look into X-10 technology. There is a variety of inexpensive
modules that can be used to turn lights and equipment on and off. There are
also inexpensive relay boards that can accept input from devices like
humidistats and send a signal. The devices can be controlled with
stand-alone controllers and/or with your computer. There is share-ware
available to schedule events and use "if-then" logic to trigger events. You
can buy X-ten hardware here:
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