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A low-cost microcontroller-based interface circuit for capacitive sensors insensitive to shunting conductance effects

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2 Author(s)
Reverter, F. ; Instrum., Sensors & Interfaces Group, Univ. Politec. de Catalunya (UPC), Castelldefels, Spain ; Casas, O.

This paper proposes a simple and low-cost interface circuit for capacitive sensors that is insensitive to the parasitic conductance (Gx) of the sensor. Such a circuit relies on a previous circuit also proposed by the authors, in which the sensor is directly connected to a microcontroller without using analog circuitry between them. The novel circuit uses the same hardware, but it performs an additional measurement and executes a new calibration technique to compensate for the effects of Gx. Experimental results show an error due to the parasitic conductance of 0.4 % for Gx=100 nS and 3 % for Gx=450 nS, which are more than ten times smaller than those obtained without the improvements proposed herein.

Published in:

Instrumentation and Measurement Technology Conference, 2009. I2MTC '09. IEEE

Date of Conference:

5-7 May 2009

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