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A measurement method for lossy capacitive relative humidity sensors based on a direct sensor-to-microcontroller interface circuit
Abstract
A new time-domain measurement method for determining the capacitance and resistance values of lossy relative humidity capacitive sensors is presented. The method is based on a direct sensor-to-microcontroller interface for microcontrollers with internal analog comparators and timers. The interface circuit consists only of four reference resistors (two reference resistors if a microcontroller includes a voltage reference source), a given sensor and a microcontroller. A systematic error correction algorithm based on a correction dictionary and the M-multiple measurement approach are also proposed in the paper. Experimental investigations were carried out using a prototype device based on an 8-bit ATXmega32A4 microcontroller. The experimental research confirmed that the relative errors of measurement of capacitance introduced by the interface circuit are less than 0.71% (for capacitance values 100 – 286 pF), and the relative errors of measurement of resistance are less than 0.74% (for resistance values 1 – 10 MOhm).
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- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
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MEASUREMENT
no. 170,
ISSN: 0263-2241 - Language:
- English
- Publication year:
- 2021
- Bibliographic description:
- Czaja Z.: A measurement method for lossy capacitive relative humidity sensors based on a direct sensor-to-microcontroller interface circuit// MEASUREMENT -Vol. 170, (2021), s.108702-
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.measurement.2020.108702
- Verified by:
- Gdańsk University of Technology
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