Design of the Wireless Intelligent Comprehensive Physique Test System

Due to the actual problems of the poor real-time performance on the original physique test equipment, a kind of wireless intelligent comprehensive physique test system is studied. By using the high precision special signal disposal and A/D conversion module, the anthropometric parameters are achieved. Through the GSM and wireless Wi-Fi module, the physical datum is transmitted to the mobile phone or tablet. Through the radio frequency identification module, the information of the measured man will be storied, and identified by testing. The physical information can be print out by the way of the micro printer. Introduction At present, with the continuous improvement of living standards, health is becoming more and more attention to their own. The formation causes about the poor physical student are analyzed from the natural environment, social environment, family education and the factors on education policy, and suggestions that how to avoid these problems are given[1]-[3].These papers analyzed the way to solve the problem from theory. But whether the constitution is good or bad, this needs to use the special measuring instrument to measure. A kind of comprehensive physique survey and health evaluation management system is designed and researched [4]. It can achieve the integrating qualitative detection and management of students. Ma [5] studied the physical measurement and evaluation system of students based on a web network platform, it can complete the comprehensive evaluation on the student’s constitution through the network in recent years. Both of Wu [4] and Ma [5] can achieve the measurement and management of students' physique constitution in the form of the network and database, but for some students, they need to login in the network system to query their own physical condition, so the real-time capability is not strong. Therefore, in this paper, a students' wireless comprehensive physique testing system is designed, which has the strong real-time capability. The function of system (1) The campus card can be brushed, the corresponding card number displays on the LCD. (2) The system can measure the body height, the range is from 1500 mm to1900 mm, and the accuracy is 5.0 mm, the error is ±5.0 mm. (3) The system can measure the body weight, the range is from 30 kg to180 kg, the precision is 0.01 kg, the error is ±0.1 kg. (4) The system can calculate the vital capacity, the range is from 1000 ml to 10000 ml, the accuracy is ±0.1 ml. The error is ±1 ml, and it can automatically recognize whether the index is qualified by the ratio of vital capacity and weight. (5) The system can complete the wireless datum transmission, all measured datum and credit card information can be transmitted to the android tablet by using the wireless transmission module, and the datum can be exported. (6) The system can realize the receiving and transmission of data and messages, all personal health indexes can be transmitted to their phone. International Industrial Informatics and Computer Engineering Conference (IIICEC 2015) © 2015. The authors Published by Atlantis Press 926 The overall design and measurement principle The overall design The overall system includes the MCU hardware detection and data sending module (called lower computer) and the mobile phone or tablet receive module (known as upper computer), the overall structure is shown in figure 1, it is a parameter measurement module, and can complete the display of weight, vital capacity, height. The human physique parameters display on the mobile phone or a tablet, the other measured information can display too, such as IC number, name, age, and so on. Fig.1 The overall structure diagram of system Measurement principle and calculation (1) The measuring principle of weight The double parallel cantilever beam and strain type weighing sensor is adopted. It is that the strain gauge is pasted on the sensitive type of elastic element, when the elastic element is stressed, it can produce the corresponding deformation. The resistance change caused by the force will be converted into the voltage changes of the measurement circuit. Using the special A/D converter chip HX711, the analog voltage is converted to the digital quantity, it is transmitted to single chip microcomputer. Through the software conversion, the weight of measured object can be obtained. It is expressed in T, and can be calculated by formula (1). date AD T _ 16777216 170 × = (1) (2) The measurement principle of vital capacity The big flow sensor AWM720P1 is adopted, the air is collected from 0 l/min to 200 l/min, and it is converted into the voltage value from 1 v to 5 v. Through the A/D converter chip ADC0832, the signal is converted into the digital quantity, which is transmitted to MCU, and then converted into the vital capacity by software in the single-chip microcomputer, and the result displays on the LCD. Using the T0 timer, the sampling time interval is 0.5 second, all the measured values are accumulated, and eventually the vital capacity is achieved. It is expressed in F, and can be calculated by formula (2). 113 45 1 _ 100 − × = date AD F (2) (3) The measuring principle of height The draw-wire displacement sensor is used, it can convert the displacement amount into the pulse signal, and these signals are generated by the incremental encoder. When the movement occurs, the rope is stretched and contracted. The wheel turns the encoder, the electric signal is generated that the output strength is proportional to the rope mobile distance, the displacement of moving object is concluded by the way of measuring the output signal. It is expressed in SG, and Weight sensor A/D Converter Keyboard module Micro computer LCD display module Serial port WIFI module Sending and receiving module of messages Vital capacity sensor Draw-wire displacement sensor