the circuit of soil humidity monitor part 1

Published:2011/6/2 1:02:00 Author:Ariel Wang | Keyword: soil, humidity , monitor | From:SeekIC

When the soil is too wet(the humidity is over the value of upper limit set by RP2),the resistance between two humidity probe electrodes reduces.It makes V1,V2 and V4 conducted of saturation.It stops V3 and V5 .It conducted V6.It lights VL2.Those indicate the humidity of the soil is too high..At the same time,VD2 is conducted.The audiofrequency oscillator works,BL will ring. When the soil is too dry(the humidity is lower than the value of low limit set by RP1),the resistance between two humidity probe electrodes increases.It makes V3 and V5 conducted of saturation.It stops V1 ,V2,V4 and V6 .It conducted V6.It lights VL1.Those indicate the humidity of the soil is too low.At the same time,VD1 is conducted.The audiofrequency oscillator works,BL will ring.



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