基于单片机的体脂秤设计.pdf

摘 要 体脂秤是一个非常贴近生活的产品，在现在的生活中具有非常大的实际意义， 其意义体现在人们生活中制定合理的饮食，运动计划中能够起到非常大的作用。体 脂秤的基本测量原理为生物电阻抗分析法（BIA ），利用四片 50kg 量程的传感器 串接成200kg 量程的压力传感器与一片 HX711 芯片组成人体体重测量模块；利用 AD5933 阻抗转换器与双电极组成人体阻抗测量模块。再将这两个模块结合到一起 做成双电极式的体脂秤，然后利用与人体身高、年龄、性别、体重、人体阻抗相关 的回归方程计算出体脂率。体脂秤的人体体重测量范围为0~200kg ，体脂率测量范 围为 5%~50%，测量误差不超过 5% 。 关键词：体脂秤；压力传感器；HX711 ；双电极；AD5933 I ABSTRACT The body fat scale is a product that is very close to life. It has great practical significance in the present life. Its significance is reflected in the rational diet in peoples lives. The exercise plan can play a very big role. The basic measurement principle of body fat scale is Bioelectrical impedance Analysis (BIA). It uses four 50kg range sensors to connect 200kg range pressure sensor and one HX711 chip to form human body weight measurement module. It uses AD5933 impedance converter and two electrodes. Human body impedance measurement module. The two modules are combined to form a two-electrode body fat scale, and then the body fat ratio is calculated using a regression equation relating to human body height, age, sex, body weight, and body impedance. The body weight measurement range of body fat scale is 0~200kg, the body fat rate measurement range is 5%~50%, and the measurement error is less than 5%. Keywords: Body fat scale ; Pressure Sensor ; HX711 ; Double electrode ; AD5933 II 目 录 摘 要I ABSTRACTII 第一章 绪论 1 1.1 课题研究背景 1 1.2 国内外研究背景1 1.3 设计报告内容的安排 1 第二章 体脂秤的总体设计 3 2.1 设计目标 3 2.2 体脂秤的整体结构框图 3 2.3 体重测量方案 3 2.3.1 体重测量模块设计 3 2.3.