CN115016348A

CN115016348A - Multichannel plantar pressure monitoring system

Info

Publication number: CN115016348A
Application number: CN202210673725.1A
Authority: CN
Inventors: 万蓬勃; 王朋利; 弓太生; 苗容容; 郭天宏; 常雨鑫; 张琳; 李学青
Original assignee: Shaanxi University of Science and Technology
Current assignee: Shaanxi University of Science and Technology
Priority date: 2022-06-14
Filing date: 2022-06-14
Publication date: 2022-09-06

Abstract

The invention discloses a multi-path plantar pressure monitoring system, which comprises: a first data acquisition device, comprising: the first sensor circuit is used for collecting a plantar pressure signal of one foot of the measured object; the first master control circuit is used for converting the signals collected by the first sensor circuit into digital signals; the wireless transmitting circuit is used for sending out the digital signal; a second data acquisition device, comprising: the second sensor circuit is used for collecting a plantar pressure signal of the other foot of the measured object; the second main control circuit is used for converting the signals acquired by the second sensor circuit into digital signals; and the data transmitting circuit is used for transmitting the digital signals output by the wireless transmitting circuit and the second main control circuit to the data receiving device. The device for independently detecting the two feet can meet the real-time plantar pressure data required by professional analysis, and low-cost and high-efficiency data acquisition is realized in the aspect of cost, so that the device is very strong in practicability and favorable for popularization.

Description

Multichannel plantar pressure monitoring system

Technical Field

The invention relates to the technical field of health monitoring, in particular to a multi-channel plantar pressure monitoring system.

Background

When a person stands or walks, plantar pressure is generated due to the self-gravity. The plantar pressure detection technology is a technology for acquiring plantar pressure data in real time by an integrated circuit and a pressure sensor. Research and development of plantar pressure detection technology covers multiple fields, and research and analysis are needed on the basis of the subjects of biomechanics, textiles, electronics, wireless transmission and the like. The plantar pressure technology can be applied to realize that: medical assistance, fall detection, gait recognition, and the like.

In accordance with modern medical research, changes in plantar pressure have often been accompanied by the development of disease, and during the past decades, the analysis of plantar pressure has changed from theory to a tool for diagnosing disease. When the foot suffers from a disease or the motion state of the foot itself changes, the sole pressure changes accordingly. Therefore, the change of the plantar pressure of the human body under different states (between normal people and patients, between standing and walking) can be studied, the stress change conditions and the physiological and pathological parameters of all parts of the human body can be further analyzed and obtained, and the stress change conditions and the physiological and pathological parameters can be used together with medical history and other examinations to diagnose the health degree of the human body.

Most of the sole pressure detection technologies at the present stage are single-foot or double-foot detection systems which are not independently separated, and scientific research is not facilitated.

Disclosure of Invention

The embodiment of the invention provides a multi-path plantar pressure monitoring system, which is used for solving the problems existing in single-foot detection or double-foot non-independent and separated detection in the prior art.

In one aspect, an embodiment of the present invention provides a multi-channel plantar pressure monitoring system, including:

first data acquisition device for gather the plantar pressure data of measurand foot, first data acquisition device includes:

the first sensor circuit is used for collecting a plantar pressure signal of one foot of the measured object;

the first master control circuit is electrically connected with the first sensor circuit and is used for conditioning and carrying out analog-to-digital conversion on the signals acquired by the first sensor circuit to obtain corresponding digital signals;

the wireless transmitting circuit is electrically connected with the first main control circuit and is used for transmitting the digital signals output by the first main control circuit in a wireless signal mode;

the second data acquisition device is used for acquiring the plantar pressure data of the other foot of the measured object, and comprises:

the second sensor circuit is used for collecting a plantar pressure signal of the other foot of the measured object;

the second main control circuit is electrically connected with the second sensor circuit and is used for conditioning and carrying out analog-to-digital conversion on the signals acquired by the second sensor circuit to obtain corresponding digital signals;

and the data transmitting circuit is electrically connected with the second main control circuit and is used for receiving the signal transmitted by the wireless transmitting circuit and the digital signal output by the second main control circuit and transmitting the signal and the digital signal to the data receiving device.

The multi-path plantar pressure monitoring system has the following advantages:

compared with the prior art, the device that biped independently detected required real-time plantar pressure data when can satisfying the analysis of professional, and accomplished low-cost on the cost problem, efficient data acquisition, the practicality is very strong, can do benefit to the popularization.

Drawings

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

Fig. 1 is a schematic diagram illustrating a multi-channel plantar pressure monitoring system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a sensor circuit provided by an embodiment of the present invention;

fig. 3 is a schematic diagram of a wireless transmitting circuit according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a power circuit according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a voltage converting circuit according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a filter circuit according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a data access circuit according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a master control circuit according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a crystal oscillator circuit according to an embodiment of the invention;

FIG. 10 is a diagram of a data transmission circuit according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a reset circuit according to an embodiment of the present invention;

FIG. 12 is a diagram illustrating a mode selection circuit according to an embodiment of the present invention;

FIG. 13 is a schematic diagram of a power indication circuit according to an embodiment of the present invention;

FIG. 14 is a diagram of a program download circuit according to an embodiment of the present invention;

fig. 15 is a schematic view of a working process of a multi-channel plantar pressure monitoring system according to an embodiment 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.

Fig. 1 is a schematic composition diagram of a multi-channel plantar pressure monitoring system according to an embodiment of the present invention. The embodiment of the invention provides a multi-channel plantar pressure monitoring system, which comprises:

Illustratively, the first sensor circuit and the second sensor circuit each comprise a plurality of data acquisition sensors, and the plurality of data acquisition sensors are respectively used for acquiring pressure signals of different positions of the sole of the measured object. In the embodiment of the present invention, as shown in fig. 2 to 14, the number of the data acquisition sensors in the first sensor circuit and the second sensor circuit is 8, and both the data acquisition sensors may adopt thin film pressure sensors, the 8 thin film pressure sensors adopt a voltage dividing resistance manner to detect pressure signals of a sole thumb area, second to fifth toe areas, a first second metatarsophalangeal joint area, third and fourth metatarsophalangeal joint areas, a fifth metatarsophalangeal joint area, the medial side of the middle foot, the medial side of the heel and the lateral side of the heel of a measured object, and the main control circuit may adopt an array scanning manner to acquire signals of the sensor circuits.

Furthermore, the first sensor circuit and the second sensor circuit are respectively arranged in the first data unit and the second data acquisition unit. The first data unit and the second data acquisition unit are insoles, the insoles are of three-layer structures and are respectively provided with a foaming layer, an adhesive layer and a cotton yarn layer from bottom to top, and the first sensor circuit and the second sensor circuit are respectively arranged in the adhesive layers of the first data unit and the second data acquisition unit. The electronic components other than the sensor circuit may be soldered on the circuit board, and the circuit board may be provided in an apparatus shaped like a shoe or the like.

In an embodiment of the present invention, each of the first main control circuit and the second main control circuit includes a main control chip, the model of the main control chip is STM32F103C8T6, and the control chip may perform conditioning processing such as filtering and amplifying on analog signals input by the first sensor circuit and the second sensor circuit, and convert the conditioned analog signals into digital signals.

In the embodiment of the invention, each thin film pressure sensor is connected in series with a voltage dividing resistor of 10k Ω, so that the pin of the main control circuit (including the first main control circuit and the second main control circuit) can receive the voltage output by the thin film pressure sensor. Pins PA 0-PA 7 of the main control chip are electrically connected with the 8 film pressure sensors respectively to receive analog signals collected by the film pressure sensors, and the analog signals are converted by a conditioning module and an ADC module in the main control chip to output digital signals. The wireless transmitting circuit transmits the sole data of one foot to the data transmitting circuit arranged on the sole of the other foot, the data transmitting circuit receives the digital signals output by the second main control circuit, packages and wirelessly transmits the data, and a data receiving device such as a mobile phone or a PC machine receives the data.

The wireless transmitting circuit can adopt an NRF24L01 chip,

pins

1, 2, 3, 4, 5 and 6 of the chip are respectively connected with pins PB12, PB14, PB15, PB13, PA10 and PA8 of a main control chip, and

pins

7 and 8 are respectively connected with VCC3V3 and GND. And the data transmission circuit comprises an ESP8066 chip and a Bluetooth chip, wherein the Bluetooth chip can adopt HC-05. The ESP8266 chip is provided with an onboard PCB antenna and used for receiving digital signals sent by the data sending circuit, the ESP8266 chip can achieve the lowest power consumption, the power consumption requirements of mobile equipment and wearable electronic products are met, and meanwhile, the ESP8266 chip can reduce the output power in a coding mode, so that the power consumption of the whole product is reduced, and the problem that the current-stage intelligent wearable chip requires low power consumption is solved.

Pins

1 and 5 of the ESP8266 chip are connected to pins TXD2 and RXD2 of the main control chip, respectively, to receive digital signals transmitted by the wireless transmission circuit.

In one possible implementation manner, the first main control circuit and the second main control circuit are both electrically connected with a power supply circuit, and the power supply circuit is used for supplying power to the first main control circuit and the second main control circuit.

Illustratively, the detection system of the invention can be powered by a lithium battery, and the lithium battery can be charged by a power circuit, and the lithium battery can be a battery with 5V and 1500 mAh. This power supply circuit can adopt Type-c interface, conveniently is connected with battery charging outfit.

Further, the output voltage of the lithium battery is 5V, and the circuits such as the sensor circuit, the wireless transmission circuit, the main control circuit, and the data transmission circuit in the system need a 3.3V power supply, so that a voltage conversion circuit is needed to convert the 5V power supply into the 3.3V power supply.

In a possible implementation manner, the first master control circuit and the second master control circuit are electrically connected with a crystal oscillator circuit, and the crystal oscillator circuit is used for providing clock signals to the first master control circuit and the second master control circuit.

Illustratively, the main control chip needs to be externally connected with an 8M crystal oscillator, and pins XTALA and XTALB of the crystal oscillator circuit are respectively connected with pins OSC _ IN/PD0 and OSC _ OUT/PD1 of the main control chip.

In a possible implementation manner, the first main control circuit and the second main control circuit are both electrically connected with a power indication circuit, and the power indication circuit is used for detecting and indicating the power states of the first main control circuit and the second main control circuit.

Illustratively, when the power circuit is normally connected, a red LED in the power indication circuit is turned on to indicate the power status.

In a possible implementation manner, the first main control circuit and the second main control circuit are both electrically connected with a program downloading circuit, and the program downloading circuit is used for being connected with an external writing device so as to write data into the first main control circuit and the second main control circuit.

Illustratively, the program download circuitry may employ an asynchronous serial interface (UART1) and a serial debug interface (SWD) for external write devices to communicate and write software code, respectively.

In the embodiment of the invention, after the control program is written by Keil uVision5, the program downloader J-link can be used for connecting an external write device and a program download circuit interface end to burn the program.

Besides, the circuit also comprises a filter circuit, a data access circuit, a reset circuit and a mode selection circuit. The filter circuit comprises a plurality of filter capacitors, and is used for filtering the voltage output by the voltage conversion circuit to form stable direct-current voltage.

The data access circuit is a reserved pin and is used for connecting the expanded data acquisition sensors with the main control circuit when the number of the data acquisition sensors needs to be expanded. A reset circuit is a circuit device used to restore a circuit to an initial state. The mode select circuit may change the program write state of the circuit by setting the state of BOOT0 and BOOT 1.

A plurality of electronic devices of the invention are all welded on the printed circuit board, and the printed circuit board adopts the design process of the Altium Designer as follows:

first, the schematic diagram is updated into the PCB. The PCB is a conversion from theory to practice, a schematic diagram describes a network relation among pins of each device, and the PCB describes the size and the arrangement of real objects and lines.

And secondly, defining a working area, namely defining the size of the circuit board. If other dimensional structures are required, the dimensions of the circuit board must be adjusted to suit the requirements. If there are no other structural and dimensional requirements, click on Mechanical layer (Mechanical 1) and then press shortcut PL, which causes a closed pattern to form around the device. And pressing the EOS to set the lower left corner as the origin of coordinates, then pressing a Shift multi-selection line, and executing a shortcut key DSD, so that the setting of the working area can be completed. Sometimes, in order to prevent the finger from being cut, chamfering is carried out, and corners are drawn by circular arcs.

And thirdly, placing a positioning hole which plays a role in fixing in PCB production and patch mounting. The locating holes are typically non-metallized via holes or star-moon holes with a diameter of 3 mm.

And fourthly, carrying out layout operation on the most important part of the whole link. The layout is for better routing and improving the performance of the product. The specific method comprises the following steps: firstly, right-click selection vertical division and schematic diagram interaction are carried out beside an upper PCB file, disordered devices are arranged according to modularization, and the whole is changed into a module. And the devices in the module are placed after planning and thinking.

And fifthly, carrying out lamination (plane) setting and pressing manufacture. The system defaults to two layers of boards. A shortcut key DK is pressed to enter a stack manager, a right key is clicked and selected at a first layer, then a plane (negative plate layer) is added below the first layer, two layers are added by default, the layer names can be modified, identification is convenient, and clicking and storage are convenient.

The sixth step, wiring problem, is a very important loop. The shortcut keys PT are wired, and the wiring can not form an acute angle, preferably a 135-degree angle. And attention is paid to the space between the lines, and the 3W principle is satisfied as much as possible (the line distance satisfies 3 times of the line width) so as to avoid signal crosstalk. The wiring distance and the loop area are shortened as much as possible, the backflow path is reduced, and the layers can be changed through punching when the wiring is not through. The wires between layers are perpendicular to avoid parallel as much as possible. The power line is thickened to increase the current carrying capacity, or connected by copper plating. The heat dissipation pad is used for dissipating heat by drilling a ground hole.

And seventhly, copper is paved on the whole of the top layer and the bottom layer, a shortcut key PR is executed to draw a copper paving area according to the plate frame, and GND network attributes are selected for the copper sheets. The system can automatically avoid the non-GND bonding pad, and the copper sheet is placed in the blank area. The large-area copper laying can reduce ground backflow paths and increase the anti-interference capability. The connection between the surface layer and the bottom layer can be increased by punching multiple holes in the blank.

And step eight, adjusting the silk screen. The silk screen printing is white ink printed on a circuit board, and comprises marks such as the bit numbers of the devices such as C11, R12 and U6, the shapes of the devices, the version numbers and the like.

And a ninth step, finally and most importantly, performing Design Rule Checking (Design Rule Checking) to check that some errors such as short circuit, open circuit and silk screen overlapping exist. And (4) entering a design rule checker by the shortcut key TD, and clicking the operation DRC at the lower left corner to eliminate errors in the report.

As shown in fig. 15, the present invention uses software to control the operation of the main control chip, and the specific operation flow is as follows:

starting;

connecting a lithium battery to electrify and turning on a switch;

the system enters self-checking;

initializing a main control chip;

erasing the sector and beginning to write data to the sector;

delaying for 20 ms;

collecting sensor signals and coding;

delaying for 40 ms;

the main control chip forwards the digital signal converted by the ADC channel through the data transmission circuit;

and (6) ending.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A multi-channel plantar pressure monitoring system, comprising:

the first data acquisition device is used for acquiring plantar pressure data of one foot of the measured object, and comprises:

the first master control circuit is electrically connected with the first sensor circuit and is used for conditioning and performing analog-to-digital conversion on the signals acquired by the first sensor circuit to obtain corresponding digital signals;

the wireless transmitting circuit is electrically connected with the first main control circuit and is used for transmitting the digital signal output by the first main control circuit in a wireless signal mode;

the second data acquisition device is used for acquiring plantar pressure data of the other foot of the measured object, and comprises:

the second main control circuit is electrically connected with the second sensor circuit and is used for conditioning and performing analog-to-digital conversion on the signals acquired by the second sensor circuit to obtain corresponding digital signals;

and the data transmitting circuit is electrically connected with the second main control circuit and is used for receiving the signal transmitted by the wireless transmitting circuit and the digital signal output by the second main control circuit and transmitting the signal and the digital signal to a data receiving device.

2. The multi-channel plantar pressure monitoring system according to claim 1, further comprising:

the first sensor circuit and the second sensor circuit are respectively arranged in the first data unit and the second data acquisition unit.

3. The multi-channel plantar pressure monitoring system according to claim 2, wherein the first data unit and the second data acquisition unit are both insoles, each insole is of a three-layer structure and comprises a foaming layer, an adhesive layer and a cotton yarn layer from bottom to top in sequence, and the first sensor circuit and the second sensor circuit are respectively arranged in the adhesive layers of the first data unit and the second data acquisition unit.

4. The multi-channel plantar pressure monitoring system according to claim 1, wherein the first sensor circuit and the second sensor circuit each include a plurality of data acquisition sensors, and the data acquisition sensors are respectively used for acquiring pressure signals of different positions of the plantar of the measured object.

5. The system for monitoring the pressure on the sole of a foot according to claim 1, wherein the first and second master control circuits are electrically connected to a power circuit, and the power circuit is used for supplying power to the first and second master control circuits.

6. The system for monitoring the pressure on the sole of a foot according to claim 1, wherein the first and second master control circuits are electrically connected to a crystal oscillator circuit, and the crystal oscillator circuit is used for providing clock signals to the first and second master control circuits.

7. The system for monitoring the pressure on the sole of a foot according to claim 1, wherein the first and second master control circuits are electrically connected to a power indication circuit, and the power indication circuit is used for detecting and indicating the power states of the first and second master control circuits.

8. The system for monitoring the pressure of the sole of a foot according to claim 1, wherein the first and the second main control circuits are electrically connected to a program downloading circuit, and the program downloading circuit is used for connecting to an external writing device to write data into the first and the second main control circuits.