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| Design and Implementation of Automatic Paper Thickness Measurement System |
| Received:June 21, 2020 |
| DOI：10.11980/j.issn.0254-508X.2020.09.009 |
| Key Words:single chip microcomputer chip automatic calibration paper counting payer thickness |
| Fund Project:河北省科技支撑计划项目（18273717）；教育部产学合作协同育人基金项目（201801071001、201801267017）；河北省大学生创新创业训练计划项目（S202010104001、S202010104010）。 |
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| Abstract:STC15F2K61S2 single chip microcomputer was the main controller of the automatic measuring system of paper thickness， which was composed of RC multivibrator circuit consisted of NE555 chip and parallel metal plate， signal acquisition circuit， control circuit， storage circuit， alarm circuit， key control circuit and Nokia 5110 liquid crystal display circuit. The oscillating circuit transformed the change of the measured capacitance value into the change of the frequency value， then many algorithms were used to accurately measure the actual frequency of paper， so as to calculate the corresponding relationship with the paper amount according to different frequency values. The measuring system had the functions of frequency acquisition， processing， counting display and self-calibration， and stores the calibration data parameters in AT24C02. The system could realize the real-time display of the tested paper data in the mobile terminal through WiFi wireless communication circuit and special mobile app program. The system had the advantages of rapid discrimination， high accuracy and strong adaptability， which could meet the requirements of paper test experiment design and it provided reference for intelligent manufacture of paper testing equipment. |
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