文档介绍：电子称毕业论文
题目: 基于51单片机的电子秤设计
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摘要
该设计以51系列单片机AT89S52为控制核心,实现电子秤的基本控制功能。在设计系统时,为了更好地采用模块化设计法,分步的设计各个单元功能模块,系统的硬件部分可以分为最小系统、数据采集、人机交互界面和系统电源四大部分。最小系统部分主要包括AT89S52以及外围电路组成;数据采集部分由压力传感器、信号的前级处理和A/D转换部分组成,包括24位A/D转换器HX711;人机交互界面为键盘输入和点阵式液晶显示,主要使用LCD1602液晶显示器,可以方便的输入数据和直观的显示中文。系统电源直接通过USB线与电脑的USB口连接供电。软件部分应用单片机C语言进行编程,实现了该设计的全部控制功能。该电子秤可以实现基本的称重功能(称重范围为0~10Kg,重量误差不大于±)可以设定商品的单价。整个系统结构简单,使用方便,功能齐全,精度高,具有一定的开发价值。
关键词:单片机;压力传感器;HX711;液晶显示
Abstract
The design of 51 series single-chip puter AT89S52 as the control core, realizes the basic control function of electronic scale. In the design of the system, in order to make better use of the modular design method, the design of each unit step function module, the hardware of the system can be divided into the smallest system, data acquisition, man-machine interface and power supply system four parts. Minimum system consists of AT89S52 and peripheral circuits; data acquisition part consists of pressure sensor, signal pre-processing and A / D conversion part, including the 24 bit A / D converter HX711; man-machine interface for keyboard input and liquid crystal display, mainly using the Nokia 5110 LCD display, can easily input data and intuitive display of chinese. System power directly through the USB line and puter USB port is connected with the power supply. Software application of single-chip C programming language, to achieve the design of the whole control function. The electronic scale can realize the basic function of weighing ( weighing range of 0 ~ , weight error not greater than + / - ) can be set to the price of goods, but also has the ultra range and less range of alarm function. The whole system has the advantages of simple structure, convenient use, complete function, high precision, has the certain development value.
Key words: single chip puter; pressure sensor; HX711; liquid crystal display
第1章绪论
在我们生活中经常都需要测量物体的重量,于是就用到秤,但是随着社会的进