承诺人（签名）： 2012 年 05 月 09日 摘 要 本设计主要设计BMI（Body Mass Index，身体质量指数）体重测试仪系统的信号处理过程，继而实现整个BMI体重测试。BMI体重测试仪系统主要包括称重传感器、放大器、信号处理过程和液晶显示是整个系统的关键。BMI测试过程：由传感器采集的电信号，经过一系列的信号处理过程和输入的身高值，由BMI=体重（kg）/(身高^2)得到最终的结果。传感器由两个50kg的半桥称重传感器组成全桥，其称量范围是100kg。BMI值最终由采集到的体重和用户输入的身高决定。 本BMI体重测试仪系统主要是由带A/D转换功能的单片机STC12C5A16S2控制单元，由电阻式应变片获取电信号，经AD620放大器、按键、显示模块以及软件程序来完成整个称重系统。本设计运用LCD1602液晶分两行显示采集到体重值，用户输入的身高值和经系统处理过的BMI值和用户的身体质量状况，其直观、易读的特点将会受到用户的热爱。 显然由单片机控制的体重秤具备使用方便，直观，测量准确，成本低等特点。此外，随着现代社会随着人们生活水平的提高，人们对自己的身体健康越来越关注，为此BMI体重测试仪越来越凸显出了其广泛的市场前景受。若BMI体重测试仪广泛地使用在家庭生活中，将会为提高我均寿命做出巨大贡献。 关键字：BMI；体重计；STC12C5A16S2；称重传感器；AD620 ABSTRACT This design mainly the design signal processing system of BMI weight tester, then realize the entire BMI weight test. BMI weight tester system mainly including weighing transducer, amplifiers, signal processing and liquid crystal display is the key to the whole system. BMI test process: from sensors to collect the electrical signals, after a series of signal processing and input height value, by BMI = weight (kg) / (height ^ 2) get the final outcome. The whole bridge weighing transducers composition of two 50kg half bridge weighing transducers and its range is weighing 100kg. BMI eventually is decided by the collected weight and the height of the user. The BMI weight tester system is mainly composed of taking A/D conversion function of the single chip microcomputer STC12C5A16S2 control units, by the resistance strain gauge type for electrical signal ,through the process of amplifier AD620, buttons, display module and software program to complete the whole weighing system. This design uses LCD1602 to display the collected weight
