Recurrent control

[gtsamis]

Hi everyone,

I'm looking for a way to control a valve according to user-defined intervals and durations. 
For instance, if the interval is set to 20 minutes and the duration to 5 minutes, the valve should:

1. Turn on
2. Stay on for 5 minutes
3. Turn off
4. Wait for 20 minutes before repeating the cycle

I considered using scheduled scripts, but I believe there might be a more efficient solution. Could anyone suggest the best approach to achieve this functionality?

Thanks in advance,
George