Published:2011/5/22 20:26:00 Author:Sue | Keyword: Agricultural, Automatic, Water Feeder | From:SeekIC
When the level is lower than b, IC's 2 pin is high level and 3 pin outputs low level. K is connected and K1 is connected. K2 is disconnected and KM is connected. M begins to feed water.
When the level reaches A, IC's 2 pin becomes low level and 3 pin outputs high level. K is released and K1 is disconnected. K2 is connected and KM is disconnected. M stops working.
When the level is lower than b, IC's 2 pin becomes high level and 3 pin output low level. K and KM are connected and M begins to feed water again.
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