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2003 S&T e-Digest Contents



Vol. 41, Issue 3, March 2004, pp. 181-190




Microcontroller Based Dielectric Constant Measurement


A. Rajendran, P. Neelamegam*

PG and Research Department of Applied Physics, Nehru Memorial College,

Puthanampatti, Tiruchirappalli, Tamil Nadu-621 007, India

*PG and Research Department of Physics, AVVM Sri Pushpam College,

Poondi, Thanjavur, Tamil Nadu-613 503, India


Received: 15 February 2004   /Accepted: 20 March 2004   /Published: 23 March 2004


Abstract: A dielectric constant measurement setup has been developed to measure dielectric constant of liquids using AT89C55WD microcontroller. A modified operational amplifier based AC Schering Bridge network is used to compute capacitance and hence calculate dielectric constant of liquids. This instrument system permits recording of dielectric constant of liquids at various concentrations and temperature and sends data to a computer to enable the computer processing of such data. A dedicated AT89C55WD (8-bit) based microcontroller and its associated peripherals are employed for the hardware. The details of its interface to measure dielectric constant of liquids, temperature and to control the temperature at desired range and evaluate results are explained in this paper.


Keywords: AC Shering Bridge, Dielectric Constant, Temperature Measurement, Microcontroller


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