文档介绍：单片机电子称毕业论文
题目: 多功能电子秤
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,为了更好利用AT89S52的资源,系统扩展了电子日历时钟与温度检测模块,系统可以分为最小系统、数据采集、人机交互界面和系统电源、时钟、温度检测和语言报数六大部分。最小系统部分主要包括AT89S52和经典复位电路;数据采集部分由称重传感器、信号放大和A/D转换部分组成,信号放大和A/D转换部分主要由专用型高精度24位AD转换芯片HX711实现;人机交互界面为键盘输入和点阵式液晶显示,主要使用4*4矩阵键盘和太阳人公司的1602液晶显示器,可以方便的输入数据和直观的显示数据;系统电源以外接9V电源和板上电源电路为核心设计电路以提供系统正常工作电源;时钟模块主要由时钟芯片DS1302和时钟电路组成;温度检测主要由DS18B20实现;语音报数模块可语音报读时间和电子秤系统的重量、单价、金额等语音内容,主要由SC1010B实现。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0~5Kg,重量误差不大于±),并扩展了时钟、温度检测和语音报数的功能,时钟模块还可设置闹钟功能。系统在称量时还具有超量程报警功能。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;称重传感器;高精度高增益A/D转换器;1602液晶;矩阵键盘;DS1302;DS18B20;语音报数
ABSTRACT
The design for the control of puters AT89S52 core, to achieve the basic control functions of electronic scales. In the design of systems, to better use AT89S52 the resources, systems expand the electronic calendar clock with temperature detection module, the system can be defined as Least systems, data acquisition, man-machine interactive interface and the system power supply, clock ,the number of temperature measurement and number of languages reported  six parts . Minimum System includes some AT89S52 and classic reset. Data acquisition is achieved by the load cell, signal amplification and A / D ponents, signal amplification and A / D converter, which consists of specialized high precision 24-bit AD converter chip HX711; Interactive interface for the keyboard input and dot-matrix liquid crystal display, the main use of 4 * 4 matrix keyboard and LCD display 1602 Sun were public, you can easily input data and visual display of data; System power is an external 9V power supply and power supply circuit board designing for the core circuit to provide normal power supply system; Clock module posed of clock chip DS1302 and the clock circuit; Temperature detection is achieved mainly by DS18B20; Voice reported that the number of modules can enroll in time for voice and electronic weighing system, the weight, unit pri