摘要电子秤是将检测与转换技术、计算机技术、信息处理和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息息相关。电子称主要以单片机作为中心控制单元，通过称重传感器进行模数转换，再配以键盘、显示电路及强大软件组成。电子称不但计量准确、快速方便，更重要的自动称重、数字显示。61407

本系统的设计主要从硬件电路设计，软件编程调试，实物焊接调试三部分进行详细阐述。硬件电路主要是基于TI公司生产的单片机MSP430F5529为核心的控制单元实现数据的处理，采用压力传感器获取被测物体的重量，采用24位AD转换芯片HX711对传感器采集到的模拟量进行AD转换，转换后的数据送到单片机进行处理，数据显示由MSP430F5529开发板上的LCD模块进行显示。

毕业论文关键词  MSP430F5529  电子秤  压力传感器  HX711

毕业设计说明书（论文）外文摘要

Title   Simple Weighing Device Based on MSP430                     

Abstract Intelligent electronic scale is the detection and conversion technology, computer technology, information processing, digital technology, an integrated modern technology of new weighing equipment. 

Ectronic scale takes MSP430F5529 as its central controling unit,and achieves AD transform through weighting transducer,then adds keybord,display circuit and powerful softerwear. It is not only accurate,swift,and convenient, but also makes an important effect to people’s life by its automatic weightment and digital display, so it becomes more and more popular.

The design of this system gives its eleboration from three parts: Hardwear circuit design,softwear programme debugging and entity weld debugging.

Hardwear circuit reaches data processing by the controling unit which based on STC89S52，and gathers data by weighting transducer,then makes AD transform by HX711 to the data gathered, and the transformed data then transferred to STC for display prosessing, at last LCD on MSP430F5529 would show it out steadily.

Keywords  MSP430F5529  Electrnoic Scale  Load sensor  HX711

1 绪论 1

1.1 本课题的研究背景和意义 1

1.2研究现状 2

1.3 论文主要内容和预期目标 3

1.4 论文组织和结构 3

2 称重系统总体方案设计 4

2.1 称重系统基本工作原理 4

2.2 称重系统模块方案设计 4

2.2.1 主控制器模块方案设计 5

2.2.2 数据采集模块方案设计 5

2.2.3 数据显示模块方案设计 6

2.2.4 电源管理模块方案设计 6

2.3 设计方案总结 7

3 称重系统硬件设计 7

3.1 MSP430F5529单片机最小系统 8

3.1.1 MSP430F5529单片机介绍 8

3.1.2 MSP430F5529最小系统介绍 11

3.2 信号采集模块电路设计 12

3.3 信号处理电路设计 14

3.3.1 AD工作原理 14

3.3.2 信号放大电路设计