基于单片机电子秤HX711目录摘要引言.doc

安徽建筑大学毕业设计（论文） 安徽建筑大学 毕 业 设 计 (论 文)课 题 基于单片机的电子秤设计 系 （院） 电子与信息工程学院 专 业 通信工程 班 级 09通信（1）班 学生姓名 唐杰 学 号 09205040133 指导教师 吕虹 2013年 6 月7日摘 要电子秤与我们日常生活紧密结合成为一种方便、快捷、称量精确的工具，广泛应用于商业、工厂生厂、集贸市场、超市、大型商场、及零售业等公共场所的信息显示和重量计算。本文用单片机设计了一个电子秤，并给出了设计框图、硬件组成及软件系统。本系统以51单片机最小系统为核心，主要的部件有24位专用串行A/D转换芯片HX711、悬臂梁式电阻应变传感器，显示采用LCD1602液晶。系统通过传感器将压力转换为微弱的电信号，即电阻应变片感到压力后，电阻发生微小变化。通过全桥测量电路将电阻的微小变化转化成电压的微小变化，再经过24位专用串行A/D转换芯片，HX711将微小的电压信号转化为24位的串行数字信号输入到单片机进行处理，最后输出到液晶显示器上。本设计采用的24位专用串行A/D转换芯片HX711，具有分辨率高，占用I/0口少，与外设接口简单等优点。关键词：电子秤；应变式电阻传感器；HX711；单片机；LCD1602AbstractElectronic scale is closely integrated with our daily lives into a convenient, fast, precision weighing instrument, widely used in commercial, plant health plant, country markets, supermarkets, shopping malls, and retail and other public places, information display and weight. It designed a electronic scale by using the single chip computer, which included the frame drawing, hardware structure and software system. It based on 51 microcomputer system and included other models, such as dedicated A/D converter chip HX711 and cantilever-type resistance strain sensor. The output was displayed by LCD1602.This paper converted the pressure into weak signal. That is when the pressure was included by resistance strain gauge sensor, small changes in resistance occurred. It would be converted to voltage with full-bridge measurement circuit. Then the 24 special serial A/D converting chip HX711 converted the small changes in voltage into 24-bit serial digital signals, SCM processed the signals, lastly the LCD1602 displayed the output. HX711 is special for A/D converter, moreover it has high resolution and occupy less I/O ports. Importantly its interfacing with peripheral circuits is simple.KEY WO