I don't have much experience with electronics, but I think what I want to do could be cobbled together from a Radioshack.
I have a Dig 5006-IP automatic sprinkler controller. It controls 24V DC valves. It has two "SENSOR" terminals, that when closed will put the unit in bypass mode. Basically a rain sensor is attatched to this, and is normally open. When it rains, the circuit goes closed and trips the rain mode.
Unfortunately, the Hunter Rain-Clik I bought is normally closed, and goes into open mode when it rains. Its more designed to be used inline with the valve. Something I don't want to do.
So how can I reverse this? How can I swap rainclik's signal, so that when it's closed, the dig sees it as open. And when its open, it sees it as closed? I have a soldering gun and basic knowledge of putting things together.