Hi, Ray
thank you for your feedback.
Since you dont talk about the sensor input, I suspect I got it right with 1 sensor.
And so I have come up with a circuit idea.
I will use the output of the pi to switch between the zones.
So I activate zone 1, thereby I switch a relay that conects the sensor of zone 1 to sensor input. And I activate a time unit.
If the zone is wet, then zone 1 is switched off again before time unit activates the ball valve.
If the zone is dry, then zone 1 is kept on, and the time unit after a minute or what ever will aktivate a switcher relay that in turn will activate the ball valve. then after a fixed time (modifyed by weather data) the zone 1 is going offline, the senser goes off line and the switcher relay will switch the ball valve back. then later on the moisture level will be checked again with the same procedure. and if still to dry, watering will ocure by the same parameters as before.
I want do this for all my zones.
Question, would this work?
Thanks