数字电子秤的设计

论文编号:JD824  论文字数:5657,页数:17

数字电子秤的设计

摘要：在我国，秤的使用已经有着两千多年的历史，最早有杆秤、台秤、案秤等。但是随着社会的进步、电子科学的发展，我们对秤的使用要求操作方便、易于识别。所以我们需要研制出一种高精度的数字电子秤。本任务就是设计出一个电路，可实现重量的检测并能够使其数字化显示。测量电路中最主要的元器件就是电阻应变式传感器，通过其检测到信号，采用全桥测量电路对检测到的信号进行处理，使系统产生的误差更小，输出的数据更精确，然后再通过三级放大电路把传感器输出微弱的模拟信号进行一定倍数的放大，最后经过A/D转换将信号送入单片机进行处理并用LED液晶显示器显示出被称物体的质量。这样设计出的数字电子秤具有误差小，精度高，测量简便等优点。
关键词：单片机 ；数字电子秤；电阻应变式传感器； 全桥测量  

The design of digital electronic scales

Abstract：In China, the scale has been used for more than two thousand years has the history of the earliest steelyard, platform scale, scales, such as text. However, with the advancement of our society, the development of e-science, we require the use of scale is easy to operate, easy to identify. Therefore, we need to develop a high-precision digital electronic scales. The task is to design a circuit, can be achieved and be able to detect the weight of its digital display. Measurement circuit is the most important component of resistance strain sensor, the signal is detected through its use of full-bridge measurement circuit of detected signals are processed, the system error resulting from a smaller, more accurate output data, and then through three transported to the sensor output amplifier weak to carry out a certain multiple of analog signal amplification, and finally, after A / D conversion into single-chip signal processing and liquid crystal display with LED has been shown that the quality of objects. This design of digital electronic scales with a small error and high precision, the advantages of easy measurement.
Keywords: Single-chip microcomputer; digital electronic scales; resistance strain sensor; full-bridge measurement

目录
摘要 I
Abstract I
1引言 1
2.设计的任务和特点： 1
3.设计的基本工作原理及原理框图 1
4. 硬件电路设计 2
4.1. 传感器的选择 2
4.1.1 电阻应变式传感器的组成以及原理 2
4.1.2 电阻应变式传感器的测量电路 3
4.2 三级放大电路 5
4.3  ADC0809 A/D转换器 5
4.3.1  ADC0809的内部逻辑结构 5
4.3.2 引脚结构 6
4.3.3 数字量输出及控制线 7
4.3.4 ADC0809应用说明： 7
4.4 LED显示电路设计 8
4.4.1 LED显示器结构与原理 8
4.4.2 LED显示器与显示方式 8
4.5  整体工作电路原理图 9
5.软件设计 11
6 结论 14
7  参考文献 14
谢   辞 15