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A New Approach to Capacitive Sensor Measurements Based on a Microcontroller and a Three-Gate Stable RC Oscillator
Abstract
A complete smart capacitive sensor solution basedA complete smart capacitive sensor solution based on a microcontroller was developed. This approach includes the development of both the hardware and software. The hardware part comprises an 8-bit microcontroller equipped with two timers/counters and a three-gate stable RC relaxation oscillator. The software part handles system configuration, measurement control, communication control, and data processing. Hence, the microcontroller acts as a frequency meter with an adaptive measuring time, and the relaxation oscillator generates a square wave with a frequency depending on the value of the capacitance of the sensor. The paper also proposes a calibration method that reduces the measurement range to 1 pF. The experimentally proven relative measurement errors of sensor capacitance are less than 0.012% for values smaller than 12 pF, and less than 0.0084% for values from 12 pF to 300 pF.
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Keywords
Details
- Category:
- Articles
- Type:
- artykuły w czasopismach
- Published in:
-
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
pages 1 - 9,
ISSN: 0018-9456 - Language:
- English
- Publication year:
- 2023
- Bibliographic description:
- Czaja Z.: A New Approach to Capacitive Sensor Measurements Based on a Microcontroller and a Three-Gate Stable RC Oscillator// IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT -,iss. 72 (2023), s.1-9
- DOI:
- Digital Object Identifier (open in new tab) 10.1109/tim.2023.3244851
- Sources of funding:
-
- COST_FREE
- Verified by:
- Gdańsk University of Technology
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