the circuit of humidity detector for food part 2

Published:2011/6/6 1:24:00 Author:Ariel Wang | Keyword: humidity, detector, food | From:SeekIC

When to be detected,the graininess foodstuffs are put into the two plate electrodes of the capacitive humidity sensor .The air medium between two plate electrodes turns to dissipation change.It changes the capacitance.The oscillation frequency of multivibrator changes at the same time.The more humidity amount of foodstuffs ,the smaller amount of the sensor.And oscillation frequency of the multivibrator will become faster.The DC voltage of V1 base electrode becomes higher.The output voltage of V2 emitter becomes higher.LED(VL1-VL4) will give more light.



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