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We designed a balance measure system, which is made up of the test platform and the handhold device. It can measure the movement of the tester’s barycenter, and display the track of the barycenter on the screen, then the system can estimate the tester’s balance ability based on the track. This system is useful to the physical health care and medical aspect. Introduction Balance function is an important function of the nervous system of the human body, and many nervous system diseases show different degrees of balance dysfunction. The detection of human balance function has been paid more and more attention by people in the field of noninvasive medical testing and physical examination. But at present, most of the instruments used in the market are large, complex, high cost and power consumption. The purpose of this paper is to design a portable human body balance testing device with simple operation and low power consumption, which can meet the needs of the users. System design scheme In testing platform three angle installed under three pressure sensors, when testing the test platform, three pressure sensors will output a corresponding voltage signal, through the signal conditioning circuit and data amplification acquisition circuit backward through the serial port to transfer to the target board, the target board according to the balance principle of moment of force and the data for real-time processing body centre of gravity is in the plane of the projection coordinates is, so as to draw out the trajectory of the center of gravity. Test platform Two stage signal amplifier circuit AD conversion Data analysis Show the center of gravity movement track Evaluation algorithm Fig. 1 the overall frame of the system of the balancing instrument Power module design. The target machine circuit board mainly needs 5V, digital 3.3V and analog 3.3V three kinds of power supply. Digital 3.3V and analog 3.3V using inductance at a point of isolation. Due to the limited space of the target board, and the requirement of the power supply is not very high, so the use of SPX1117 as the target machine voltage regulator chip. The SPX1117-5 and SPX1117-3.3 are used to provide the working voltage of 5V and 3.3V for the target machine. 6th International Conference on Machinery, Materials, Environment, Biotechnology and Computer (MMEBC 2016) © 2016. The authors Published by Atlantis Press 1415 Fig. 2 typical circuit of SPX1117 As shown in Fig.3, the use of SPX1117 is very simple, only a few capacitors can be used, the figure of the LED lamp is to test the power chip is working properly. Fig. 3 power supply circuit diagram Data acquisition and amplification module. The target machine collects the signal of the pressure sensor, and the signal of the pressure sensor is a differential mode signal, and the signal of the pressure sensor is also mixed with the common mode signal interference. So the front end needs a high common mode rejection ratio of the instrumentation amplifier to filter out the common mode interference, while the weak differential signal. INA326 is the United States TI launched precision instrumentation amplifier. It uses a unique topology, can achieve the positive and negative input / output power supply, very suitable for single power, low power consumption and precision measurement occasions. As shown in Figure 4, for the INA326 single power supply circuit, R1 and R2 for the programmable resistance, amplification of G=2 (R2/R1). The circuit diagram is shown in Fig.5. Fig.4 INA326 single power supply typical circuit diagram

Research on portable multi function dynamic human body balance detecting instrument