Today I mounted the relays into a steel box along with a power supply. I have a single power cord feeding everything - the transformer and a 5 volt power cube. The power cube runs the Arduino and the relay board. It all seems good. Tomorrow I'll mount it all on the wall and wire it up to the solenoids. In the afternoon Libbie and I went to BJ's at crossroads for ribs and cheese then stopped into Home Depot across the street for plumbing pipes and 2x6x8 to finish the roof framing for the new greenhouse. Dinner was ribs, shiraz and butternut squash.