the circuit of auto water supplier for agriculture(1)

Published:2011/6/4 20:41:00 Author:Ariel Wang | Keyword: auto, water, supplier, agriculture | From:SeekIC

When the knife switch Q gets through,AC 220V voltage is reduced by T,commuted by UR and filtered by C1.It provides 10V DC voltage(Vcc) for input circuit and control circuit of water level detection.When the water level of the water tank reaches electrode b,the resistence of water will be short-circuit by R2.It makes the voltage of IC's 2nd-pin and 6th-pin higher than Vcc/3,but lower than 2Vcc/3(about Vcc/2).The inner circuit sets up.The 3rd-pin still output high level.VT stays conducted.Electric motor of water pump M goes on pumping.When the water level of the water tank reaches electrode a,the resistence of water will be short-circuit by R1.It makes the voltage of IC's 2nd-pin and 6th-pin higher than 2Vcc/3.It makes the high level of 3rd-pin jump to low level.VT stops. M is power-off .And it stops pumping.



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