大学毕设论文__电子体重秤系统的研究与设计 .doc

太原科技大学 毕 业 设 计 设计题目：电子体重秤系统的研究与设计 姓 名 学院（系） 电子信息工程学院 专 业 测控技术与仪器 年 级 指导教师 2015 年 6 月 摘要 体重秤存在的最古老证据来源于印度河流域，至今大概有4000多年的历史。随着社会逐渐发展，人类的物质生活水平逐渐提高，越来越多的人因体重过高而患上高血压，高血脂等疾病，因此能实时了解自己的体重情况是生活中一件很重要的事。称重能及时发现自己体重健康状况，从而控制自己的体重，避免因肥胖而患上疾病。当前市场上已有各式各样的体重秤，它们能实现称重的目的，但是部分体重秤存在一些问题，比如称量精度较低、比较耗电、可称量的范围较小、不能被一部分体重特殊的人群使用等问题。基于这种现状，本文提出一种简易的体重秤研究与设计方法，使人们花费很少的价格就能买到一款精度较高、响应速度快的体重秤。本设计采用四个相同的金属丝式应变片作为压力传感器，实现将被测重量转化为电阻的变化量，再将电阻的变化量转换为模拟电压的变化量，之后采用四臂全桥接线法的方式作为测量电路，并且将测到的模拟电压值接入HX711这款芯片，经过该芯片的电压信号放大和AD装换后用STM32单片机来采集数据并处理，最后通过LCD液晶屏显示出来。整个设计完成了量程为5kg~150kg，显示精度为0.1kg的高精度体重秤，而且能快速实时的显示体重，达到了商业衡器的精度，满足了实际生活中的基本称重需求，实现本设计的目的。 关键词： 重量，金属丝式应变片，压力传感器，HX711芯片，STM32单片机 ABSTRACT The oldest evidence of the existence of scales from the Indian River, has about 4,000 years of history. With the progressive development of society, peoples material living standards gradually improved, more and more people were overweight and suffering from high blood pressure, high cholesterol and other diseases, so they can understand their own body weight in real-time situations is something very important in life thing. Weighing can find the health of their weight to control their weight, to avoid suffering from the disease of obesity. The current market has a wide range of scales, they can achieve the purpose of weight, but there are some problems portions scales, such as lower weighing accuracy, more power, smaller weighing range can not be part of the weight of special people to use and other issues. Based on this situation, we propose a simple weight scale research and design methods to make people spend very little price you can buy a high precision, fast response scales. This design uses the same four wire strain gauges as pressure sensors, the measured weight into resistance variation, then the amount of change in resistance is converted to an analog voltage variation, followed by