I live in a climate that is sufficiently variable that it doesn't lend itself to programmed irrigation. At present I use simple mechanical timers. Put a sprinker in place, turn the timer on, and go do something else for 1-2 hours.
However this means I can't leave for more than 2 hours.
What I would like is a timer that has 2 controls: One is a delay, one is the run time. With such a system, and a timer for each hosebib (I have 9 hosebibs)
Go to area 3. Turn on water manually, adjust sprinkler, turn off water, set delay of 4 hours, run time of 2 hours.
Go to area 2. Turn on water manually, adjust sprinkler, turn off water, set delay of 2 hours, run time of 1.5 hours.
Go to area 1. Turn on water manually, adjust sprinkler, set run time of 1:45
So far all of the timers I've found are either simple mechanical ones that allow you to set a time to turn off, or they are programmed timers that have to repeat start at a given time and run time.
Some have a manual 'start watering now' feature, but this does not have a delay.
The unit cannot require access to 110v. It's 1200 feet from the nearest plugin.
For similar reasons using a PC based controller is not an option.
It seems to me that this would be a useful device for people who water their lawns at night.
Additional clarification: (Added because of answer #1)
The application will require a different use EVERY DAY. (sometimes twice a day.)
A timer that: * Repeats today at any time in the future is NOT wht I want. * Has a manual mode that only waters NOW is NOT what I want. * Requires more than 15 seconds to set for the day is NOT what I want.
I need: * Settable delay * Settable runtime. * Run. It will run ONCE and never run again until I come and hit the run button.
Desireable * Remembers last used parameters, so, if today is similar to yesterday, I may only have to change one parameter.
I need the functionality of a 2 clock mechanical timer where I twist one dial to set delay and another dial to set run time. The functionality can be emboddied in an electronic timer, but it has to be easy to set.
Does anyone know of a timer that allows to quickly set a delay and a run time, and it runs once and stops.