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1、 编编 号：号： 审定成绩：审定成绩： 重庆邮电大学重庆邮电大学毕业设计（论文）毕业设计（论文）设计（论文）题目：设计（论文）题目： 基于基于 AVR 的无线电子称的无线电子称学学 院院 名名 称称 ：学学 生生 姓姓 名名 ：专专 业业 ：班班 级级 ：学学 号号 ：指指 导导 教教 师师 ：答辩组答辩组 负责人负责人 ：填表时间：填表时间： 年年 月月重庆邮电大学教务处制重庆邮电大学教务处制 诚信承诺书本人慎重承诺和声明：本人在毕业设计（论文）过程中遵守学校有关规定，恪守学术规范，在指导教师的指导下独立完成，没有剽窃和抄袭他人的学术观点、思想和成果，未篡改研究数据，若有违规行为的发生，我愿
2、接受学校处理，并承担一切法律责任。论文作者签名： 年 月 日 重庆邮电大学本科毕业设计（论文）重庆邮电大学本科毕业设计（论文）-I-摘摘 要要随着人们追求更加量化和健康的生活方式，以及科学研究对微观世界的探索。各领域对于电子计量产品的精度，可靠性都提出了非常高的要求。传统的计量技术由于其工艺制作靠的是机械加工或者手工制造，在精度及可靠性方面都已经不可能适应现代计量应用的发展。传统计量仪器不能通过网络与其他设备进行通信也极大的削弱其市场竞争力。在物联网到来的时代里，已经不允许不能通信的产品存在世界上。要实现物物相连，最基本的要求就是自己首先能够和其他设备进行通信。至于其他更加高级的功能，譬如远程
3、控制、智能控制，也都是建立在这个基础之上。所以，智能仪器仪表俨然已经成为当今仪器发展的主流。并在未来很长一段时间内持续这种状况。电子技术的告诉发展，计算机技术的不断提高都给传统的电子测量与仪器的研究和应用带来了翻天覆地的变化，甚至已经取缔传统的计量工具。作为重量测量仪器，高精度、高稳定性是最为基本的要求，而物联网的诞生和智能仪器仪表的发展则对计量仪器提出更高的要求，并且提供了多种很有可行性的事项方法。智能电子称在各个行业的应用已经开始显现其测量准确，测量速度快，易于实时测量和监控，并且可与计算机进行通信等巨大优点，开始逐渐取代传统型的机械杠杆测量称，成为测量工具的的主流产品。在智能电子称的设计
4、中主要要解决实现高精度、高稳定性的测量，这是传统仪器仪表所不能达到的，其通信功能可以利用现有的技术，有多种实现的方法。本文设计的无线电子称以 AVR 单片机为主控制芯片，用 C 语言进行软件设计，硬件则以应变式压力传感器和无线发射模块为主要元器件。压力传感器输出的是模拟量，并且数值比较小，采用自带放大电路的 HX711。HX711 具有 24 位高精度测量功能，精度达 0.1g。本设计需要的精度为误差不超过 3%，由于总量程要求在 5kg，所以精度完全达标，甚至有很大的提高。A/D 采集的 24 位数据通过串行送给单片机进行数据处理，经过软件滤波并显示最后发送至其他通信设备实现实时监控。其数据
5、显示部分采用 LCD 显示，成本低，易于控制，产品性能稳定且能很好地实现所要求的功能。【关键词关键词】 电子称 高精度 高稳定性 无线通信 重庆邮电大学本科毕业设计（论文）重庆邮电大学本科毕业设计（论文）-II-ABSTRACTAs people seek more quantitative and healthy lifestyles, as well as scientific exploration of the microscopic world.For all areas of electronic measurement accuracy, reliability have mad
6、e very high demands.The traditional measurement techniques due to its production process relies machined or hand-made, in terms of accuracy and reliability have been impossible to adapt to the development of modern metering applications.Traditional measuring instruments and other devices through the
7、 network can not communicate but also greatly weakened its competitiveness in the market.In the coming era of things have been allowed to exist in the world can not communicate with the product.To achieve material objects connected to, the basic requirement is their first be able to communicate with
8、 other devices.As for the other more advanced features, such as remote control, intelligent control, are also built on this foundation. .So , smart instrumentation seems to have become the mainstream of the instrument development. And continue to this situation in the future for a long period of tim
9、e. Tell the development of electronic technology, computer technology continues to improve gave traditional Electronic Measurement and Instrument research and application brought enormous changes , and even has banned traditional measurement tools .As a weight measuring instruments, precision, high
10、stability is the most basic requirement , and the birth and development of intelligent instrumentation of the things on the measuring instruments put forward higher requirements , and provides a variety of matters very feasible method . Intelligent electronic scale applications in various industries
11、 has begun to show its measurement accuracy, measurement speed, ease of real-time measurement and monitoring , and can communicate with the computer , such as a huge advantage , began to replace the traditional 重庆邮电大学本科毕业设计（论文）重庆邮电大学本科毕业设计（论文）-III-mechanical levers measuring scales, measuring tools
12、become mainstream products. In the design of intelligent electronic scales to solve the major high precision , high stability of the measurement , which is the traditional instruments can not be achieved , the communication function can leverage existing technology , there are many ways to achieve.
13、This design of wireless electronic scales with AVR microcontroller-based control chip, software design, hardware using C language places strain gauge pressure sensor and wireless transmitter module as the main components . The pressure sensor output is analog , and the value is relatively small , th
14、e use of an amplifier circuit built HX711. HX711 has 24 high-precision measurements, accuracy of 0.1g. The design of precision required for the error does not exceed 3 % of the total due process requirements in 5kg, so accuracy is fully achieved , even greatly improved. 24 Data A / D acquisition wil
15、l be sent to the microcontroller via a serial data processing , after filtering software and displays the last transmitted to other communication devices to achieve real-time monitoring . Its data display section with LCD display , low cost , easy to control , stable performance and can very well achieve the required functionality.【Key words】 Electronic Scale High Precision High Stability Wireless Communication重庆邮电大学本科毕业设计（论文）重庆邮电大学本科毕业设计（论文）-IV-目目 录录前前 言言.
