1、 I 基于基于 5151 的电子秤的电子秤 摘要 本文描述了基于 AT89s52 单片机设计的电子秤原理及实现方法。该系统由 51 单片机的改良版 52 单片机控制，通过液晶屏自动显示所称物体的重量。其电路构成 主要有测量电路，差动放大电路，A/D 转换，单片机控制电路、显示电路。测量电 路利用电阻式应变器件将物体的重量信号转化成相应大小的电信号，通过差动放大 电路将电信号放大到 AD 芯片能够识别的范围内从而能将电信号转换成对应的数字 信号送给单片机处理，最终在液晶上显示所称物体的重量，系统通过软件实现自动 换挡。发挥部分的显示购物清单的功能，可以设置日期和设定十种商品的单价， 还 具有超量
2、程和欠量程的报警功能。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：称重传感器 差分放大器 模数 转换器、 II Based on 51 electronic saysBased on 51 electronic says Abstract This article describes the design of AT89s52 microcontroller based electronic scale theory and implementation methods. The system consists of 51 single-chip microp
3、rocessor control improved version 52, the LCD displays that object automatically. Its components are measuring circuit, differential amplifiers, A/d conversion, the microcomputer control circuit, show circuit. The measuring circuit using resistance strain the weight of the device object into the app
4、ropriate signals to the size of the electrical signals through the differential amplifier will signal amplification to AD chip can identify scope so that they could be an electrical signal into a digital signal corresponding to the handle to the SCM in the LCD display that the weight of the object, the system automatically by software implementation. Through debugging, and testing, system performance parameters basic design index. Keywords Weighing sensors cell differential amplifier III
