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Author: search.filters.author.Petchmaneelumka, WandeeSubject: search.filters.subject.Interface circuit

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    A versatile interface circuit for capacitive and resistive sensors
    (2017-12-13)
    Petchmaneelumka, Wandee
    ;
    Mano, Pitsini
    ;
    Wutikun, Tanatat
    ;
    Riewruja, Vanchai
    This paper presents a circuit design technique for realization of a versatile interface circuit for capacitive and resistive sensors. The proposed method is based on the use of operation of relaxation oscillator. Time periods generated from two relaxation oscillators are employed for the reference signal and another sensing signal from sensor. The output signal obtained in the form of time period is proportional to the sensing value from sensor. The proposed approach provides the attraction in terms of simple configuration and low cost. The proposed circuit performances confirmed by the experimental results using commercial devices are agreed with the expected values.
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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 resistance-to-frequency converter with lead-wire-resistance compensation
    (2013-03-28)
    Julsereewong, Amphawan
    ;
    Petchmaneelumka, Wandee
    ;
    Rungkhum, Tipparat
    ;
    Yahara, Mitsutoshi
    ;
    Fujimoto, Kuniaki
    This article presents a simple technique to realize a resistance-to-frequency converter for single resistive sensor-based remote measurements. The proposed realization method uses commercially available devices to generate output frequency, which is linearly proportional to sensing resistance deviation. Experimental results are shown that not only the good circuit operation but also the effective lead-wire-resistance compensation of the proposed technique can be obtained. © 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.
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    Simple interface circuit with lead-wire-resistance compensation for single resistive sensors
    (2012-12-01)
    Petchmaneelumka, Wandee
    ;
    Julsereewong, Prasit
    ;
    Julsereewong, Amphawan
    ;
    Tongpakpanang, Jaturon
    A simple interface circuit for single resistive sensor-based remote measurements is presented. The realization method using commercially available devices provides not only the output signal linearly related to resistive sensor changes but also the compensation of effect due to lead-wire resistances. Performance of the proposed circuit is confirmed through experimental results. © 2012 ICROS.
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    Simple resistance-to-period converter for resistive sensors
    (2012-12-01)
    Tongpakpanang, Jaturon
    ;
    Rerkratn, Apinai
    ;
    Kaewpoonsuk, Anucha
    ;
    Riewruja, Vanchai
    ;
    Petchmaneelumka, Wandee
    A method for realization of resistance-to-period converter is introduced in this article. The principle of converter utilizes the behavior of designed astable multivibrator, which is implemented using commercial available and low cost devices. The operation of proposed converter circuit is in current mode. Therefore, the resistance is linearly converted to period and also converted to frequency with invert proportional relationship. The conversion gain of the proposed converter can be adjusted by electronic means. The configuration of the proposed converter is simple and small in size. Experimental results verifying the proposed converter performance are included in detail. The relative error of about 0.8 % is observed. © 2012 ICROS.