water level automatic control circuit consisting of 555

Published:2011/7/8 2:28:00 Author:Fiona | Keyword: water level automatic control | From:SeekIC

As shown in figure is water level automatic control circuit. The control circuit is composed of step-down rectifier circuit,water level measurement and control switch,flip and flop generator and so on.Step-down rectifier circuit provides VDD = 12 V power supply voltage for 555.Two steady state work patterns of 555 is used as RS trigger. BG1 and upper limit water level probe A are reset trigger switch; BG2 and the median probe B are setting trigger switch; C is the lower limit probe connecting to the ground electrical level. Using the characteristics of RS trigger and controlling the setting and resetting of 555 make the relay J absorb or release , so as to control the operation of the pumping motor D to make water level keep in the given upper limit and lower limit.



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