| 摘要 |
An automatic digital system is disclosed for controlling the duration and frequency of application of water to a lawn or the like. The system includes a keyboard to facilitate programming and/or reprogramming of both the duration and frequency of watering and one or more sets of memory circuits are included in the system to store various programs to be utilized. A digital clock controls operation of time control and generating circuitry to provide outputs to comparators along with outputs from the memory circuits to effect the desired control of solenoids establishing the duration and frequency of watering. Each set of memory circuits includes a plurality of watering stations each of which can be individually and sequentially actuated by the control system and each of which stations can have a plurality of sprinkler heads. By use of a plurality of sets of memory circuits, different watering programs can be carried out at different times as, for example, on different days of the week, and, by use of repeater circuitry, the particular watering program can be repeated as, for example, to occur several times during each day, or caused to occur only at selected intervals as, for example, every second day or the like. An LED display is also provided at the keyboard to facilitate programming and control of watering.
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