| 摘要 |
An irrigation controller having means for insuring watering, even after a failure in its primary and back-up power supplies. During a failure in the primary supply, the back-up supply is examined to determine whether it, as well, suffered a failure. If it did not, watering takes place in accordance with a programmed watering schedule following resumption of the primary supply. If it did, one or more watering stations are activated at pre-determined intervals for a pre-determined period of time following resumption of the primary supply.
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