Título:
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Error analysis and reduction for a simple sensor-microcontroller interface
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Autor/a:
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Custodio Ruiz, Ángel; Pallàs Areny, Ramon; Bragós Bardia, Ramon
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Otros autores:
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Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. IEB - Instrumentació Electrònica i Biomèdica; Universitat Politècnica de Catalunya. GRUP ISI - Grup d'Instrumentació, Sensors i Interfícies |
Abstract:
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Error analysis of a resistive sensor-to-microcontroller interface based on pulse-width modulation and time–ratio measurement shows that internal input and output resistances in microcontroller digital ports produce zero, gain and nonlinearity errors. The time–ratio measurement technique cancels these errors when the sensor resistance equals the reference resistor and reduces errors around that point. We propose two simple methods of reducing those errors for sensors with a wide dynamic range. Both methods use time–ratio measurements. The first method uses several reference resistors covering the sensor resistance range; the second method uses two-point calibration. The second method is more efficient and yields errors that can be smaller than 0.5 Ω for a sensor resistance from about 600 Ω to 3550 Ω. |
Abstract:
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Peer Reviewed |
Materia(s):
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-Àrees temàtiques de la UPC::Enginyeria biomèdica::Electrònica biomèdica -Microprocessors -Computerized instruments -Calibration -Computerised instrumentation -Electric sensing devices -Measurement errors -Microcontrollers -Pulse width modulation -Time measurement -Error analysis -Error reduction -Zero error -Gain error -Nonlinearity error -Time ratio measurement -Dynamic range -Two-point calibration -Reference resistor -Resistive sensor-microcontroller interface -Input resistance -Output resistance -Microprocessadors -Instrumentació -- Transductors -Mesurament -- Instruments -Temps -- Mesurament |
Derechos:
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Tipo de documento:
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Artículo |
Editor:
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IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
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