The device has a pair of graphite electrodes, a transistor amplifier and a bistable circuit composed of a double D flip-flop CD4013. When the soil moisture is lower than a conventional value, the flip-flop outputs a low level, thereby making a single voltage regulator. The circuit is turned over, and the output terminal 3 outputs a high level, and the thyristor SCR is triggered to conduct, the electromagnetic valve is electrically connected, and the nozzle is sprayed with water.
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