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Development of OPTO-LDR coupled timer based voltage to frequency converter

Journal of Measurement Science and Instrumentation 2017年第1期8卷 17-20页

作者： Akash Kumar anindya debnath Antar Banik Kabirul Islam Mondal Partha Pratim Biswas Rik Bhattacharyya T K Maiti 德里理工学院应用电子与仪器工程系印度加尔各答700152

This paper describes the development of a timer based voltage to frequency converter(V FC).Timer LM555is used in astable multivibrator mode with two OPTO-LDRs(light dependent resistors)in the *** frequency of timer output waveform which is measured using a digital storage oscillator(DSO)is almost linearly proportional to the applied input *** we obtain a linear relationship between the frequency of timer output waveform and the input *** of its quasi-digital output,the main advantages of this developed converter are linear input-output relationship,small size,easy portabilityand high cost *** addition,the timer output waveform can be directly interfaced with personal computer or microprocessor/microcontroller for further processing of the input voltage signal without intervening any analog-to-digital converter(ADC).

关键词： timer LM 555 astable multivibrator light emitting diode (LED) light dependent resistor (LDR) voltage to frequency converter (V FC) digital storage oscillator (DSO)

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维普期刊数据库

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Development of a simple RPM measurement system

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Journal of Measurement Science and Instrumentation 2020年第2期11卷 193-196页

作者： Akash Kumar anindya debnath Antar Banik Kabirul Islam Mondal Partha Pratim Biswas Rik Bhattacharyya T K Maiti Department of Applied Electronics&Instrumentation Engineering Netaji Subhash Engineering CollegeKolkata 700152West Bengal Department of Instrumentation Engineering Central Institute of Technology KokrajharAssam 783370India

The design and development of a timer based revolution per minute(RPM)measurement system were described in this *** rotating shaft of a dc motor was used to measure the RPM and timer integrated circuit(IC)555 was used in astable *** frequency of timer output waveform measured by a digital storage oscilloscope(DSO)is almost linearly proportional to the RPM of rotating shaft,and the RPM also linearly varies with the change of the external input voltage *** the linear relationship between the frequency of timer output waveform and the RPM can be *** main advantages of this developed system are linear input-output relationship,small size,easy to carry and cost effective.

关键词： IC 555 astable multivibrator RPM measurement

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