In order to realize the rapid measurement of the number of paper items,a paper measurement system based on capacitance de-tection is designed.The parallel plate capacitor is constructed,and the capacitance value is calculated by measuring the resonant fre-quency on the hardware"STM32+FDC2214"platform using the L-C resonant principle.The quantity of measuring paper is obtained by capacitance signal,and single measuring unit and multiple measuring units are made for comparison experiment.Introduced in sof-tware design μCOS-Ⅱ embedded operating system enhances the reliability and security of the system.The system has two modes of learning and measurement.The fitting relationship between capacitance and electrode plate spacing is obtained through the algorithm in the learning mode,and the measurement results are displayed using OLED display screen in the measurement mode.After many times of system tests,the designed system can realize the fast measurement of up to 80 sheets of paper,and improve the measurement accuracy.
关键词
电容检测/纸张测量系统/电容传感器/FDC2214/嵌入式操作系统
Key words
capacitor detection/paper measurement system/capacitive sensor/FDC2214/embedded operating system
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