Instead of starting right from scratch, he used the open-source Sustainable Irrigation Platform(SIP) control software — a Python sprinkler scheduler with some features [danman] was looking for ...
In Node-RED, click the menu on the top-right, then Import -> Examples -> node-red-contrib-sprinkler. After you assemble your schedule, you'll likely want to actually control your irrigation ... each ...
I wanted a fairly simple sprinkler controller that could handle up to 8 valves and run ... It would seem to me that the source of any electrical surge would come from the outlet, and the transformer ...