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|Halacha - sprinkler on Shabbos clock|
|Submitted by anonymous Answered by Rav Peretz Moncharsh|
There is no difference using a timer for a lawn sprinkler or a Shabbos clock for electrical appliances. According to the vast majority of Poskim there is no problem using either provided they were set before Shabbos, because you are not doing any action on Shabbos. However, R Moshe Feinstein zatzal held that setting a Shabbos clock before Shabbos would be similar to telling a goy before Shabbos to do a melacha for you on Shabbos, which is forbidden. So if your timer can be set to do different things on different days it would be preferable to set it not to turn on the water on Shabbos, however the accepted halacha is that it is permitted to use the timer even on Shabbos.