Thanks for the info, especially the howto, I'm still a bit unsure of how it will all connect. It will probably make more sense once I get the parts and start putting it all together.
Tangmonster suggested these, which I ordered today.
relay...
I pm'd Tangmonster to get some info, but maybe someone else can also assist.
I bought one of the OpenIrrigation boards from Smartkit last week. Apparantly you can control a water pump through this as well? Anyone know what I will need to do this?
I bought this for the transformer: ...