Revised the system again. Now I monitor the difference in pressure between the end of intake and end of exhaust and only increment the count for a valve if the difference is above a threshold. This allows me to know the count when a valve fails but continue the test with the other valve.
I also shortened the cycle time from two seconds to one second and added a battery backup to the control system so I don't loose count if there is a power glitch.
At 53,000 cycles and all valves working. The Rainbird solenoids are warm to the touch, but not hot.?
??? Bob KD8CGH
Bob Benedict, KD8CGH