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humidity sensor

Discussion in 'Sensors and Actuators' started by Remo, May 31, 2013.

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  1. Remo


    May 31, 2013
    I have got a amateur made humidity sensor circuit. And I am unable to understand it. It is basically a capacitive humidity sensor (honeywell HIH4000). There are two capacitors and two diodes attached to it. I have seen the circuit and have drawn it on paint brush (and I think I have dawn it correctly). The diagram is attached. Please tell me what the circuit is doing.
    The function of the whole circuit is to give voltage as a function of humidity.
    thanx alot

    Attached Files:

    • cct.JPG
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  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Specs, docu and app notes for the sensor are here.
    These documents explain the operation of the sensor.
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