Hi,
Since odd/even days can occur on different days of the week you will need to first determine how many times you want to water each week. If you are watering every day that it odd (or Even) select all the days (check the check box). If you wanted to water 2 days a week on using odd (or even) then you would check back to back days in pairs for the 2 days you wished to water. For example, you want to water 2 days a week:
Check boxes - Mon,Tue and Thu,Fri - It will then water on the days you selected (lets assume you selected odd) that are odd calender days twice per week.
You can customize the odd even selection for each station on the settings page. This is also where you need to set the 'Use Master Valve' for each station AND set the global Master Valve option.
HydroFLASH is highly configurable and you can even set a single station to Water' Any day' (say if it is a drip system) as some ordinances for odd even watering don't apply to drip systems.
If you are using version HydroFLASH version 2.0.X we now support watering scripts allowing you to create even more flexible watering options that can even specify which calender day to water on. This is a bit more advanced and there is information on how to do this on the Insteon Programs page under Edit Scenes and available in the update manual which you can download from the forum here:
viewtopic.php?f=3&t=9Hope this helps.