Polymer capacitances-type humidity sensor application circuit

Published:2011/5/10 1:14:00 Author:Fiona | Keyword: Polymer capacitances-type, humidity sensor | From:SeekIC

Illustration is polymer capacitances-type humidity sensor application circuit.It consists of two time base circuit IC1,IC2 composition.IC1 and external components compose themultivibrator which mainly triggers IC2 's pulse.ICz,capacitance-type humidity sensor and external component compose theadjustable wide pulse generator .The pulse width will depend on the humidity sensor capacitance size.The width pulse output from the IC2's ⑨ feet,filtered by R5, C3, then put out as DC signal.It is proportional to the air'srelative humidity, the sensitivity of 2mv /% RH.



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