毕业设计：基于单片机设计电子称101.doc

本文由416863836贡献 doc文档可能在WAP端浏览体验不佳。建议您优先选择TXT，或下载源文件到本机查看。 摘 要 在众多的先进技术行业中随着中国经济的飞速发展，科技的进步，中国加入 WTO 后， 全球化浪潮不断兴起。随着科技的进步,对电子秤的要求也越来越高。常规的测试仪器仪表 和控制装置被更先进的智能仪器所取代，使得传统的电子测量仪器在远离、功能、精度及 自动化水平定方面发生了巨大变化，并相应的出现了各种各样的智能仪器控制系统，使得 科学实验和应用工程的自动化程度得以显著提高。 做为重量测量仪器，智能电子秤在各行各业开始显现其测量准确，测量速度快，易于 实时测量和监控的巨大优点，并开始逐渐取代传统型的机械杠杆测量称，成为测量领域的 主流产品。 本文设计的电子秤以半桥传感器为主,测量 0～500g 电子秤，随时可改变上限阈值， 并达到阈值报警的功能。称重传感器输出的电量是模拟量，数值比较小达不到 A/D 转换接 收的电压范围。所以送 A/D 转换之前要对其进行前端放大、整形滤波等处理。然后，A/D 转换的结果才能送单片机进行数据处理并显示。其数据显示部分采用 LED 显示，成本低且 能很好地实现所要求的功能。 关健字：单片机；电子秤；LED；传感器 1 Abstract Abstract Among the advanced technology industry with the rapid development of Chinas economic, scientific and technological progress, Chinas accession to the WTO, continuing the rise of globalization. With advances in technology, the requirements of electronic scales have become more sophisticated. Conventional test instrumentation and control devices were more advanced intelligent instruments replaced the traditional electronic measuring instruments away from, function, accuracy and automation level of the tremendous changes have taken place, and the corresponding emergence of a wide range of intelligent instrument control system, makes the application of scientific experiments and the degree of automation projects can be significantly enhanced. Weight as a measuring instrument, intelligent electronic scales begin to be felt in all walks of life measurement accuracy, measurement speed, ease of real-time measurement and monitoring of the great advantages, and began to gradually replace the traditional mechanical lever-type measurement that has become mainstream products in the field of measurement . In this paper, the design of the electronic scale to half-bridge-based sensors, measurement 0 ~ 500g electronic scale, at any time can change the upper limit threshold, and to achieve the functions of alarm thresholds. Weighing sensor output is the analog power consumption, relatively small value of less t