Khan, Sheroz and Khairul Hassan, SK and Md Ralib, Aliza Aini and Ma, Li Ya and Arshad, Atika
(2010)
Simmulation of a virtual transducer using potentiometer.
In: IIUM Research, Innovation & Invention Exhibition (IRIIE 2010), 26 - 27 January 2010, Kuala Lumpur.
Abstract
This work attempts to design and implement in hardware a transducer with a nonlinear response using
potentiometer. Potentiometer is regarded as a linear transducer, while a the response of a nonlinear
transducer can be treated as a concatenation of linear segments made out of the response curve of an
actual nonlinear transducer at the points of inflections being exhibited by the nonlinear curve. Each
straight line segment is characterized by its slope and a constant, called the y-intercept, which is
ultimately realized by a corresponding electronic circuit. The complete circuit diagram is made of three
stages: (i) the input stage for range selection, (ii) a digital logic to make appropriate selection, (iii) a
conditioning circuit for realizing a given straight-line segment identified by its relevant slope and
reference voltage. The simulation of the circuit is carried using MULTISIM, and the designed circuit is
afterward tested to verify that variations of the input voltage give us an output voltage very close to the
response pattern envisaged in the analytical stage of the design. The utility of this work lies in its
applications in emulating purpose built transducers that could be used to nicely emulate a transducer in a
real world system that is to be controlled by a programmable digital system.
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