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would be interested in knowing how you built your own digital timer and how well it works?
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Engineer by education, I enjoy working on electronics projects as well. I have made several timers in the past that work very well, so i just expanded on the old one. The settings for on time and off time are 'limitless', with durations of 1 second to weeks?. For a cycle timer, i didnt care about actual times of day, which is why i used the photosensor to determine night time watering cycles. I have also made timers in the past that work on the actual time of day and a duration associated with each on time. i.e. on at 10:05 am for 10 minutes. then off. on at 2:30 pm for 25 mins. then off. etc.
For my other projects, I had the same problems with the generic timers from HD and Lowes
, and the irrigation systems were not flexible enough. So i made them myself. One was with 110V and one was for a boat battery 12V. Some bugs I had to work out here and there, but otherwise worked like a charm.