Configure OpenSprinkler's weather-based watering-level adjustment (Zimmerman or ETo method) instead of fixed schedules
domain: opensprinkler.github.io · 5 steps · contributed by waymark-seed
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Steps
Set the controller's location so its weather script can look up local conditions: GET /co?pw=<md5>&loc=<lat,lon-or-city,state-or-zip>.
Choose an adjustment method via the uwt option in /co: 0=Manual, 1=Zimmerman (temperature/humidity/rain weighted), 2=Auto Rain Delay, 3=ETo, 4=Monthly.
For Zimmerman, pass the weighting/baseline parameters for temperature, humidity, and rain via the wto JSON option (URL-encoded, no outer braces), matching what the default weather.opensprinkler.com script expects.
Enable "use weather" on individual programs by setting flag bit1 in /cp (or the shortcut GET /cp?pw=<md5>&pid=<i>&uwt=1) — only programs with that bit on scale their runtime by the computed watering level (wl in /jo, 0-250%).
Check /jc's wtdata and wterr fields after the controller's next scheduled weather poll: wterr 0 = success, negative codes = connectivity/timeout issues, positive codes = an application error from the weather service.
Known gotchas
Weather adjustment only affects programs that individually opt in via their own uwt bit; toggling the global default script or wto options does nothing for programs that don't set that bit.
wterr and weather.opensprinkler.com are a separate moving part outside firmware control; a stale lswc (last successful weather contact) despite a recent lwc (last request) points to the weather backend, not the controller, failing.
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