CN213075613U

CN213075613U - STM 32-based balancing instrument system

Info

Publication number: CN213075613U
Application number: CN202021309019.1U
Authority: CN
Inventors: 顾庆; 杨凯
Original assignee: Jiangsu Research Institute Of Sports Science
Current assignee: Jiangsu Research Institute Of Sports Science
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2021-04-30
Anticipated expiration: 2030-07-07

Abstract

The invention discloses a balance instrument system based on STM32, and relates to the technical field of exercise rehabilitation equipment. The invention comprises a control subsystem and a man-machine interaction subsystem; the control subsystem comprises an MCU circuit, a power supply module, a pressure sensor module, an AD conversion module and a direct current motor driving module; the MUC circuit is connected with an upper computer through an RS485 serial port; the man-machine interaction subsystem comprises an upper computer, a display screen, a pressure data acquisition module and a factory parameter module. According to the invention, pressure signals are acquired by a plurality of pressure sensors, an AD conversion module is communicated with the MCU through an SPI interface and transmits digital signals, a terminal processor STM32F407RBT6 is used for processing and analyzing data, the position of the gravity center is calculated, and the terminal processor is connected with an upper computer through a serial port and is used for carrying out visual man-machine interaction operation, so that the problems of poor intelligence and inaccurate pressure center coordinate analysis of the existing balance sense rehabilitation equipment are solved.

Description

STM 32-based balancing instrument system

Technical Field

The invention belongs to the technical field of exercise rehabilitation equipment, and particularly relates to a balance instrument system based on STM 32.

Background

Among the numerous physiological indexes of the human body, maintaining the body balance is a basic motor skill and an important physiological index of the human body. The physiological mechanism for maintaining the balance and stability of the human body is very complicated, and the scientific field is not clarified yet. It is widely accepted in the medical community that the brain will coordinate the body, vestibule and vision aspects, maintaining the body's static and dynamic balance through motor control of the nerves and motor systems. The key to the balance of the human body lies in the perception and adjustment of the state and position of the body by the vestibular sense, vision, nervous system and proprioceptive system. The position of the human body gravity center projected to the horizontal plane can be correspondingly changed when the body posture is changed, and the relevant characteristics of the human body balance capability can be observed by researching the change of the gravity center projection point.

For the elderly and those patients with balance dysfunction, such as cerebral apoplexy patients, Parkinson disease patients, cerebral thrombosis patients, etc., their balance ability is greatly reduced, and the balance ability test is required to prevent fall injury, etc. According to the fifth survey of the national health service in 2016, the aging problem of China is more and more prominent, and the number of patients with cardiovascular and cerebrovascular diseases and nervous system diseases is also increased rapidly, wherein the number of patients with lower limb motor dysfunction caused by central nervous system diseases such as spinal cord injury, cerebrovascular accident, brain trauma and cerebral apoplexy is increased year by year. In addition, exercise, car accidents, orthopedic diseases, muscular atrophy and the like also cause a large number of patients with lower limb motor dysfunction. Therefore, methods and researches for evaluating the balance ability of the human body are gradually increased.

The accurate evaluation of the human body balance ability also has practical significance in sports: the coach is assisted to judge the ability of the athlete to keep the stability of the athlete, and the selection of the athlete is carried out through the grade level test (excellent, good, medium and poor) of the balance ability. Meanwhile, the athlete can be evaluated for multiple times, and the evaluation results are compared to check whether the training scheme is effective or not.

The existing equipment can not objectively measure the effective training intensity and the accumulation of time in the process of carrying out lower limb balance sense exercise on the old and patients with balance dysfunction caused by external injury. In addition, the existing lower limb balance sense exercise equipment is complex in structure and poor in intelligence. Therefore, the STM32 is used for designing a balance instrument system, and the problems can be effectively solved.

Disclosure of Invention

The invention aims to provide a balance instrument system based on STM32, which is characterized in that a plurality of pressure sensors are used for collecting pressure signals, an AD conversion module is communicated with a MCU through an SPI interface and transmits digital signals, a terminal processor STM32F407RBT6 is used for processing and analyzing data, the position of the center of gravity is calculated, and the terminal processor is connected with an upper computer through a serial port and used for carrying out visual human-computer interaction operation, so that the problems of poor intelligence and inaccurate pressure center coordinate analysis of the existing balance sense rehabilitation equipment are solved.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to a balancing instrument system based on STM32, which comprises a control subsystem and a human-computer interaction subsystem;

the control subsystem comprises an MCU circuit, a power supply module, a pressure sensor module, an AD conversion module and a direct current motor driving module; the pressure sensor module is connected with the AD7795 module; the pressure sensor module is used for transmitting the read pressure value to the AD7795 module; the AD7795 module is used for converting the pressure value from an analog signal into a digital signal; the AD7795 module is in communication connection with the MCU circuit through the SPI interface; the MUC circuit is connected with the direct current motor driving module; the output end of the direct current motor driving module is connected with a motor; the output end of the power supply module is connected with the MUC circuit;

the MUC circuit is connected with an upper computer through an RS485 serial port;

the human-computer interaction subsystem comprises an upper computer, a display screen, a pressure data acquisition module and a delivery parameter module; the upper computer is connected with the display screen through an HDMI (high-definition multimedia interface); the upper computer is used for visual interaction between a human body and a machine, selection of platform height and display of a moving track of the center of gravity of the human body; the upper computer comprises an upper computer main interface, a pressure data acquisition interface and a factory parameter interface.

Preferably, the MCU circuit adopts STM32F407RBT6 as a main control chip.

Preferably, the power supply module adopts a TPS5430 chip; the TPS5430 chip integrates a low-impedance high-side N-channel MOSFET; and a voltage error amplifier is integrated in the TPS5430 chip.

Preferably, the pressure sensor module is designed by 4Pin, wherein

pins

1 and 4 are respectively connected with an analog reference voltage and an analog ground, and

pins

2 and 3 are used as analog signal input.

Preferably, the AD conversion module adopts an AD7795 chip; the AD7795 chip is internally provided with a low-noise 24-bit/16-bit 6-path differential input ADC; an on-chip low noise instrument amplifier is integrated in the AD7795 chip; and the AD7795 chip is communicated with the MCU circuit through the SPI interface and transmits the converted digital signals to the MCU circuit.

Preferably, the direct current motor driving module adopts an MC33931 chip.

Preferably, the pressure data acquisition module can set two modes of single acquisition and continuous acquisition through the host computer, and when the continuous acquisition mode is selected, the data acquisition can be finished at any time by clicking a button for stopping acquisition.

The invention has the following beneficial effects:

according to the invention, pressure signals are acquired by 12 pressure sensors, the AD conversion module is communicated with the MCU through the SPI interface and transmits digital signals, the terminal processor STM32F407RBT6 is used for processing and analyzing data, the gravity center position is calculated, the terminal processor is connected with an upper computer through a serial port, visual man-machine interaction operation is carried out, the gravity center position is accurately and clearly calculated, and then whether the balance function of a testee is normal or not is judged, patients with balance capacity disorder are detected, and the detection efficiency of hospitals can be greatly improved. The device and the method are not only suitable for the rehabilitation of the lower limbs of patients, but also can be used for the balance sense test of athletes, and have better flexibility.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a balance instrument system based on STM 32;

FIG. 2 is a circuit diagram of the MCU module design of the balancer system of the present invention;

FIG. 3 is a circuit diagram of a power module of the balancing system of the present invention;

FIG. 4 is a circuit diagram of a pressure sensor interface module of the present invention balancing machine system;

FIG. 5 is a circuit diagram of an analog-to-digital conversion module of the present invention;

FIG. 6 is a circuit diagram of a power module of the balancing system of the present invention;

FIG. 7 is a software flow of the human-computer interaction system of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the invention relates to a balancing instrument system based on STM32, which comprises a control subsystem and a human-computer interaction subsystem;

the control subsystem comprises an MCU circuit, a power supply module, a pressure sensor module, an AD conversion module and a direct current motor driving module; the pressure sensor module is connected with the AD7795 module; the pressure sensor module is used for transmitting the read pressure value to the AD7795 module; the AD7795 module is used for converting the pressure value from an analog signal into a digital signal; the AD7795 module is in communication connection with the MCU circuit through the SPI interface; the MUC circuit is connected with the direct current motor driving module; the output end of the direct current motor driving module is connected with a motor; the output end of the power supply module is connected with the MUC circuit; the direct current motor driving module is used for controlling the lifting of the balance table; the balance table is placed on a horizontal plane in a static mode, a human body stands on the balance instrument in a static mode, the pressure value of the human body to the pressure sensor at the bottom of the balance instrument is transmitted to the computer through the control circuit, then the coordinate of the pressure center on the plane of the balance instrument is calculated through the mechanical principle, and finally the track image of the pressure center coordinate is drawn. By analyzing the change of the trajectory, the quality of the balance ability can be judged.

the human-computer interaction subsystem comprises an upper computer, a display screen, a pressure data acquisition module and a delivery parameter module; the upper computer is connected with the display screen through an HDMI interface; the upper computer is used for visual interaction between a human body and a machine, selection of platform height and display of a moving track of the center of gravity of the human body; the upper computer comprises an upper computer main interface, a pressure data acquisition interface and a factory parameter interface.

As shown in fig. 2, the MCU circuit uses STM32F407RBT6 as a main control chip, because all data processing and transmission are concentrated in the terminal module, and the whole lower layer hardware is integrated, the system uses STM32F407 to construct the whole lower layer circuit for functional implementation and high efficiency. The STM32F103 is a development board which applies a 32-bit microcontroller and has 72MHz power consumption, takes Cortex-M3 as a core and has high integration of functions of each module. The driving of the motor, the realization of the serial port function and the pushing of the data packet are realized by the operation of a Cortex-M3 pin.

Referring to fig. 3, the power supply module employs a TPS5430 chip; the TPS5430 chip integrates a low-impedance high-side N-channel MOSFET; a voltage error amplifier is integrated in the TPS5430 chip; this version of TPS5430 integrates a low impedance high side N channel MOSFET. A high-performance voltage error amplifier is integrated inside the voltage regulator, has strict voltage regulation precision under the transient condition, and has the function of undervoltage locking so as to prevent the input voltage from starting when reaching 5.5V; the built-in slow start circuit limits surge current, and the voltage feedforward circuit improves transient response.

Referring to fig. 4, the pressure sensor module is designed with 4 pins, where

pins

1 and 4 are connected to analog reference voltage and analog ground, respectively, and

pins

2 and 3 are used as analog signal inputs.

Referring to fig. 5, the AD conversion module employs an AD7795 chip; an ADC with 24 bits/16 bits of low noise and 6 paths of differential inputs is arranged in the AD7795 chip; an on-chip low-noise instrument amplifier is further integrated in the AD7795 chip, and small signals can be directly input into the ADC; the AD7795 chip is communicated with the MCU circuit through the SPI interface, and the converted digital signals are transmitted to the MCU circuit.

Referring to fig. 6, the dc motor driving module uses an MC33931 chip, and the driving of the dc motor uses 3.3V. 33931 is a monolithic H-bridge power integrated circuit in a robust thermally enhanced package. It is primarily designed for automotive electronic throttle control, but is also applicable to all application specific connected cations of current and voltage limit control listed herein in any low voltage dc servo motor. The bridge is able to control the inductive load at 33931H with currents up to 5.0 peak. The RMS current capability is the degree to which the heat sink provides to the device package. The internal peak current limited (specified) load current activates the above-mentioned 6.5 ± 1.5 a-output load may be pulse width modulated with a frequency up to 11 khz. The load current feedback function provides a ratio (0.24% of load current) suitable for the a/D input of a current monitoring output singlechip. Undervoltage status flag output reports, overcurrent and overtemperature faults.

The pressure data acquisition module can set two modes of single acquisition and continuous acquisition through the host computer, and when the continuous acquisition mode is selected, the data acquisition can be finished at any time by clicking a stop acquisition button.

One specific application of this embodiment is:

the balance table is placed on a horizontal plane in a static mode, a human body stands on the balance instrument in a static mode, the pressure value of the human body to the pressure sensor at the bottom of the balance instrument is transmitted to the computer through the control circuit, then the coordinate of the pressure center on the plane of the balance instrument is calculated through the mechanical principle, and finally a track image of the pressure center coordinate is drawn; by analyzing the change of the track, the balance ability can be judged, and the human body cannot be absolutely static and slightly shakes to be reflected on the image.

Referring to fig. 7, after power is turned on, the lower computer initializes all the related peripherals, and when the RTC clock reaches 1s, the LED lamp is controlled to flash, which indicates that the initialization of the peripherals is completed, and the upper computer software is started. The user selects the mode on the display screen of the upper computer, adjusts the height of the balance table, the upper computer sends the height information to the MCU through the serial port, the MCU serial port is triggered to be interrupted, and then the height adjusting motor is set to rotate according to the user. And after the height adjustment is finished, stopping on a human-computer interaction interface. After the user selects the balance table, the image of the balance table is displayed on the display screen, the center of gravity of the person is calculated, the coordinates of the center of gravity are updated in real time along with the movement of the center of gravity of the human body, and the moving track of the center of gravity can be seen on the image.

It should be noted that, in the above system embodiment, each included unit is only divided according to functional logic, but is not limited to the above division as long as the corresponding function can be implemented; in addition, specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.

In addition, it is understood by those skilled in the art that all or part of the steps in the method for implementing the embodiments described above may be implemented by a program instructing associated hardware, and the corresponding program may be stored in a computer-readable storage medium.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A kind of equilibrium instrument system based on STM32, including control subsystem and man-machine interaction subsystem, characterized by that:

the control subsystem comprises an MCU circuit, a power supply module, a pressure sensor module, an AD conversion module and a direct current motor driving module; the pressure sensor module is connected with the AD7795 module; the pressure sensor module is used for transmitting the read pressure value to the AD7795 module; the AD7795 module is used for converting the pressure value from an analog signal into a digital signal; the AD7795 module is in communication connection with the MCU circuit through the SPI interface; the MCU circuit is connected with the direct current motor driving module; the output end of the direct current motor driving module is connected with a motor; the output end of the power supply module is connected with the MCU circuit;

the MCU circuit is connected with an upper computer through an RS485 serial port;

2. The STM 32-based balance meter system according to claim 1, wherein the MCU circuit adopts STM32F407RBT6 as a main control chip.

3. The STM 32-based balancer system according to claim 1, wherein the power supply module is a TPS5430 chip; the TPS5430 chip integrates a low-impedance high-side N-channel MOSFET; and a voltage error amplifier is integrated in the TPS5430 chip.

4. An STM 32-based balance gauge system according to claim 1, wherein the pressure sensor module is of 4Pin design, with pins 1 and 4 connected to analog reference voltage and analog ground, respectively, and pins 2 and 3 as analog signal inputs.

5. The STM 32-based balancer system according to claim 1, wherein the AD conversion module is an AD7795 chip; the AD7795 chip is internally provided with a low-noise 24-bit/16-bit 6-path differential input ADC; an on-chip low noise instrument amplifier is integrated in the AD7795 chip; and the AD7795 chip is communicated with the MCU circuit through the SPI interface and transmits the converted digital signals to the MCU circuit.

6. An STM 32-based balance gauge system according to claim 1, wherein the DC motor driving module adopts MC33931 chip.

7. The STM 32-based balance instrument system according to claim 1, wherein the pressure data acquisition module can set two modes of single acquisition and continuous acquisition through an upper computer, and when the continuous acquisition mode is selected, the data acquisition can be finished at any time by clicking a stop acquisition button.