the circuit of humidity detector for food part 1

Published:2011/6/8 16:18:00 Author:Ariel Wang | Keyword: humidity , detector, food | From:SeekIC

When to be detected,the foodstuffs are put into the space between two metal plates of the capacitive humidity sensor.The humidity amount of foodstuffs is changing as the capacity changes.Then the oscillation frequency of multivibrator is changing as well.The shortwave signal which outputs from the pin-3 of IC becomes triangular wave signal.It becomes DC voltage after it is commutated by VD1 and VD2.It reveals itself through voltmeter PV(the more amount of the food humidity,the larger capacity of the sensor,and the higher of the voltage PV displays).



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