Hello,
I am looking for a device or tweak for a cycle timer controller for irrigation valve. User should be able to set the number of minutes to turn on the valve and the cycle like 6 hours or 12 hours. For saving battery, we decide to use latching valve. The latching valve will require 9DC positive pulse to turn it on and negative pulse to turn it off.
I think maybe Sonoff SV GPIO can do the work.