By Topic

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

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

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