本科毕业论文(设计_)基于单片机数字电子秤的设计(软件部分).doc

本科毕业论文设计
基于单片机数字电子秤的设计
摘要
电子秤是将检测与转换技术、计算机技术、信息处理、数字技术等技术综合一体的现代新型称重仪器。它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。
电子秤的基本工作原理:作用于物体上的重力使称重传感器的弹性体上的应变片所组成的惠斯登电桥产生了0~25mV左右的传感器信号(信号的大小与重量成正比),经过模拟信号放大器将传感信号放大为0~3V左右,再经过模拟转换电路将模拟电压转换为内码数字。最后,经过单片机控制单价设置,金额运算,各种参量送显,通过显示器显示出重量、金额、单价等数据。
本系统针对电子称的自动称重、数据处理等进行了设计和制作。为了阐明用单片机是如何对采样数据进行处理,对数据的采集和转换、计算问题进行了研究,讨论了单片机控制系统中关键的计算问题。本文在给出智能电子称硬件设计的基础上,详细分析了电子称的软件控制方法。单片机控制的电子称结构简单,成本低廉,深受人们的喜爱,本文将对此进行详细讨论。
关键词:电子称;单片机;称重传感器;放大器;A/D转换
Abstract
Electronic scales is will detection and conversion technology, computer technology and information processing, digital technology integrated a modern new weighing apparatus. It and our daily life closely as a convenient, quick, weighing precise tools, widely used in business, factory born factory, market fair, supermarkets and large shopping mall, and retail and other public places information display and weight calculation.
The basic skills of electronic scales for principle: in the role of the gravity of the object to the weighing transducer of elastomer strain gauge of hui sterns bridge produce 0 ~ 25m V or so sensor signal (signal is proportional to the size and weight), after the analog signal amplifier will sensing amplification is 0 ~ 3 V or so, again by simulation of transform circuit simulation for code voltage digital. Finally, after a single-chip puter control unit price setting, amount operation, all kinds of parameters to show, through the display shows, unit price and amount of weight and data.
This system for electronic says the automatic weighing, data processing, design and production. To illustrate how by single chip for sampling data processing, data acquisition and the conversion, calculation problem discussed, the single chip puter control system of the calculation problem of the key. In this paper are intelligent electronic says hardware design, and on the basis of the detailed analysis of the electronic says software control