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Author: search.filters.author.Cheypoca, ThepjitSubject: search.filters.subject.Capacitive sensor

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    OTA-based capacitance-to-period converter for capacitive sensors
    (2013-03-28)
    Kanjanapart, Naratorn
    ;
    Cheypoca, Thepjit
    ;
    Riewruja, Vanchai
    ;
    Petchmaneelumka, Wandee
    A simple design technique for realization of a capacitance-to-period converter based on operational transconductance amplifiers (OTAs) is presented in this paper. The proposed principle utilizes the behavior of astable multivibrator. The configuration of converter is implemented using commercial available and low cost devices. The obtained time period is proportional to sensing capacitance. The conversion gain of proposed scheme can be changed by electronic means. Circuit performances verified by experimental results are agreed with the expected values. © 2013 ICIC International.
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    Simple interface circuit for resistive/capacitive sensors
    (2013-01-01)
    Tongcharoen, Jakkapun
    ;
    Petchmaneelumka, Wandee
    ;
    Cheypoca, Thepjit
    ;
    Rerkratn, Apinai
    ;
    Riewruja, Vanchai
    This paper presents a method to realize interface circuit for resistive and capacitive sensors. The proposed circuit employs commercially available devices to generate the output signal in form of time period, which is linearly proportional to the both of sensing resistance and capacitance. Circuit configuration is simple and small in size. Experimental results verifying the performances of the proposed circuit are also included.