Feature? – water x inches per week

[Michael]

I assume open sprinkler does not support this feature. I’m trying to understand if anyone is working on it, or if it is even possible.

I’d like to build a schedule that ensures the lawn receives 1 inch per week of water. To work this would need to do a number of things:
– store a ‘flow’ value for each sprinkler in terms of inches per hour
– track the amount of rain over the past 7 days of scheduled run
– calculate the amount of water needed in current run based upon
— water gap = amount of water req’d – rain over last 7 days
— length of run = water gap / flow * zimmerman adjustment
– run time will be capped at a maximum run time (set per sprinkler)

breaking this down a bit (for each sprinkler) ..
unsigned long flow; // rate of water distributed by sprinkler as generic units / minute
unsigned long max_time; // max runtime in minutes of a sprinkler
unsigned long water_amt; // # units of water to deliver per period
unsigned long water_prd; // # days in the period

at this point, I’m not sure there is a mechanism that tracks how much water was provided over a time period…. opensprinkler doesn’t have a database does it? maybe I can do this from my Vera controller …

Anyone try this?

[Ray]

If you use a flow sensor (which is supported by firmware 2.1.6), it logs the total amount of water each day, and you can get the data through HTTP GET command. If you are modifying the firmware you can certainly use additional variable to help you keep track of flow data any way you need.

[Author]

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