摘要： 应变片测重仪使用了转换与检查技术、信号的处理、数字技术等技术。是一款现代的新型测重仪器。应变片测重仪由应变片传感器、放大电路、A/D模块、单片机、键盘和显示器以及软件组成。应变片测重仪在测重方面非常精确、快速测重、并有使用数字液晶显示。具有很好的实用性。80541

本次设计我们需要分设计硬件电路,编写软件程序,对实物进行焊接这三个步骤进行。在硬件电路设计方面,经过与老师的讨论淘汰了初期准备选择的arduino选择了STC系列的51单片机,使用电阻式应变片传感器进行数据的收集,由于应变片传感器产生的模拟量很小采用了 HX711模块内置的低噪声可编程放大器对其进行放大。在利用 HX711进行AD转换。利用单片机进行数字信号的处理在进行显示。利用该原理我们可以制作出一个符合本次课程设计要求的智能测重仪。

关键词：应变片；测重仪；STC89C51；HX711

The circuit and program design of weight gauge based on strain gauge

Abstract: 

  The strain gauge weighing instrument uses such techniques as conversion and inspection, signal processing and digital technology。 It is a new type of weighing instrument。 The strain gauge weight meter consists of strain gauge sensor, amplifying circuit, A/D module, single chip microcomputer, keyboard and display, and software。 Strain gauges are very accurate in measuring weight, quick in weight measurement, and digital liquid crystal display。 The utility model has good practicability。

  In this design, we need to design the hardware circuit, write software program, and carry out the three steps of welding in kind。 In the aspect of hardware circuit design, after discussion and teachers out of the early preparation of selected Arduino chose STC Series 51 microcontroller, data were collected using the resistance strain gauge sensor, the analog sensor will have little use of low noise HX711 module built-in programmable amplifier to enlarge。 Using HX711 for AD conversion。 The use of single-chip digital signal processing, in the display。 With this principle, we can make an intelligent weighing instrument that meets the requirements of the course design。

Keywords: Strain gauges;Measuring instrument; STC89C51;HX711

目录

摘要 i

 Abstract ii

1 绪论 1

1。1 称重技术 1

1。2 称重技术的发展现状和发展趋势 2

1。2。1 发展现状 2

1。2。2 发展趋势 2

1。3 应变片测重仪 4

1。3。1 测重仪的结构 4

1。3。2 测重仪的原理 4

1。3。3 测重仪的计量性能 5

1。4 本设计大致思路 5

2 系统硬件设计 6

2。1 系统总体设计方案 6

2。2