The Design And Implementation Of Human Body Fat Content Measurement System Based On Impedance Measurement

In recent years,the number of overweight and even obese population is becoming more and more huge,which caused serious harm to human health problems can not be ignored.Therefore,this paper presents an index to reflect the degree of obesity,and to detect the indicators to understand and improve their physical condition.Body fat ratio is measured on weight than traditional measurement can scientifically reflect the way of measuring the proportion of body fat.At present,the price of most of the body fat detectors on the market is expensive for ordinary household consumer.Under this background,this paper designs and implements a system based on the measurement of body fat content of body impedance measurement and the author will use Bluetooth wireless data transmission to the body fat of the Android mobile phone,mobile phone on the measurement results in display and storage.In addition,the future development of the mobile phone network transmission function,the data will be sent to a remote database for data storage and comprehensive analysis.The specific contents of the article are as follows:1?Based on the model of human body composition and body impedance,the relationship between human body impedance and body fat was proposed;In order to put forward the design idea of the electrode,the basic principle of the electrode is introduced.2?A simple four electrode measurement system is designed based on the impedance model and electrode theory;The direct digital frequency synthesis is chosen to produce the sine voltage signal with the frequency of 50kHz;Using pressure flow conversion module for converting the voltage signal to current signal with constant amplitude,current signal by stimulating electrode system into the human body,by measuring the electrode voltage drop;The instrument amplifier circuit and the peak detection circuit are designed to get the DC signal.3?In this paper,the relationship between the human body impedance and fat content is studied and introduced;The design and implementation of Bluetooth communication software and based on the Android system has the function of interface display and data storage of App mobile phone development,the design of the data transmission protocol,analysis of the data packet protocol to complete the development of software.4?The experiment of the measurement of body fat rate was completed,and the corresponding experimental data were obtained.