Accuracy and resolution of direct resistive sensor-to-microcontroller interfaces
| Autor: | Manel Gasulla, Ramon Pallas-Areny, Ferran Reverter, Josep Jordana |
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| Rok vydání: | 2005 |
| Předmět: |
Systematic error
Engineering Resistive sensors Resistive touchscreen business.industry Resolution (electron density) Metals and Alloys Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention Microcontroller law Range (statistics) Calibration Electronic engineering Electrical and Electronic Engineering Resistor business Instrumentation |
| Zdroj: | Sensors and Actuators A: Physical. 121:78-87 |
| ISSN: | 0924-4247 |
| Popis: | This paper analyses the accuracy and resolution of direct resistive sensor-to-microcontroller interfaces using theoretical and experimental methods. Three calibration techniques are evaluated: single-point, two-point and three-signal. This last method is a two-point calibration technique that needs a single calibration resistor. For each calibration formula, we analyse both the effects of the internal resistances of the microcontroller pins on the accuracy and the resolution, which is evaluated by the combined standard uncertainty of the calculated resistance. The experimental analysis was performed by measuring resistors in the range of Pt1000-type temperature sensors with two commercial microcontrollers (AVR AT90S2313 and PIC16F873). The experimental results were similar for both microcontrollers and agreed with theoretical predictions. For the AVR, the three-signal measurement method yielded a 0.01% relative systematic error and a 0.10 Ω resolution when averaging 10 calculated resistances. |
| Databáze: | OpenAIRE |
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