CN115016348A - Multichannel plantar pressure monitoring system - Google Patents

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

A multi-channel 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 technique

When a person stands or walks, plantar pressure is generated due to their own gravity. Plantar pressure detection technology is a technology that collects plantar pressure data in real time with integrated circuits and pressure sensors. The research and development of plantar pressure detection technology covers many fields, and it needs to be studied and analyzed on the basis of biomechanics, textiles, electronics, wireless transmission and other disciplines. Plantar pressure technology can be used to achieve: medical assistance, fall detection and gait recognition.

According to modern medical research, changes in plantar pressure are often accompanied by the emergence of diseases. In the past few decades, the analysis of plantar pressure has changed from a theory to a tool for diagnosing diseases. When the foot has a disease or its own movement state changes, the plantar pressure will change accordingly. Therefore, by studying the changes of plantar pressure in different states of the human body (between normal people and patients, between standing and walking), it is possible to further analyze and obtain the force changes and physiological and pathological parameters of various parts of the human body, so as to be compatible with The medical history and other examinations are used in combination to diagnose the health of the human body.

At this stage, the plantar pressure detection technology is mostly a single-foot or two-foot detection system that is not separated independently, which is not conducive to scientific research.

SUMMARY OF THE INVENTION

The embodiment of the present invention provides a multi-channel plantar pressure monitoring system, which is used to solve the problem in the prior art that the detection of a single foot or that the feet are not independently separated.

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

The first data collection device is used to collect the plantar pressure data of one foot of the tested object, and the first data collection device includes:

The first sensor circuit is used to collect the plantar pressure signal of one foot of the tested object;

The first main control circuit is electrically connected to the first sensor circuit, and is used for conditioning and analog-to-digital conversion of the signal collected by the first sensor circuit to obtain a corresponding digital signal;

a wireless sending circuit, electrically connected to the first main control circuit, for sending the digital signal output by the first main control circuit in the form of a wireless signal;

The second data collection device is used to collect the plantar pressure data of the other foot of the tested object, and the second data collection device includes:

The second sensor circuit is used to collect the plantar pressure signal of the other foot of the measured object;

The second main control circuit is electrically connected to the second sensor circuit, and is used for conditioning and analog-to-digital conversion of the signal collected by the second sensor circuit to obtain a corresponding digital signal;

The data sending circuit is electrically connected with the second main control circuit, and is used for receiving the signal sent by the wireless sending circuit and the digital signal output by the second main control circuit, and sending the signal to the data receiving device.

A multi-channel plantar pressure monitoring system in the present invention has the following advantages:

Compared with the prior art, the device for independent detection of both feet can meet the real-time plantar pressure data required by professionals for analysis, and achieves low-cost and high-efficiency data collection in terms of cost, which is very practical and can be used. conducive to promotion.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of the composition of a multi-channel plantar pressure monitoring system provided by an embodiment of the present invention;

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

3 is a schematic diagram of a wireless transmission circuit provided by an embodiment of the present invention;

4 is a schematic diagram of a power supply circuit provided by an embodiment of the present invention;

5 is a schematic diagram of a voltage conversion circuit provided by an embodiment of the present invention;

6 is a schematic diagram of a filter circuit provided by an embodiment of the present invention;

7 is a schematic diagram of a data access circuit provided by an embodiment of the present invention;

8 is a schematic diagram of a main control circuit provided by an embodiment of the present invention;

9 is a schematic diagram of a crystal oscillator circuit provided by an embodiment of the present invention;

10 is a schematic diagram of a data transmission circuit provided by an embodiment of the present invention;

11 is a schematic diagram of a reset circuit provided by an embodiment of the present invention;

12 is a schematic diagram of a mode selection circuit provided by an embodiment of the present invention;

13 is a schematic diagram of a power indicator circuit provided by an embodiment of the present invention;

14 is a schematic diagram of a program downloading circuit provided by an embodiment of the present invention;

FIG. 15 is a schematic work flow diagram of a multi-channel plantar pressure monitoring system according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

FIG. 1 is a schematic diagram of the composition of a multi-channel plantar pressure monitoring system according to an embodiment of the present invention. An embodiment of the present invention provides a multi-channel plantar pressure monitoring system, including:

The first data collection device is used to collect the plantar pressure data of one foot of the tested object, and the first data collection device includes:

The first sensor circuit is used to collect the plantar pressure signal of one foot of the tested object;

The first main control circuit is electrically connected to the first sensor circuit, and is used for conditioning and analog-to-digital conversion of the signal collected by the first sensor circuit to obtain a corresponding digital signal;

a wireless sending circuit, electrically connected to the first main control circuit, for sending the digital signal output by the first main control circuit in the form of a wireless signal;

The second data collection device is used to collect the plantar pressure data of the other foot of the tested object, and the second data collection device includes:

The second sensor circuit is used to collect the plantar pressure signal of the other foot of the measured object;

The second main control circuit is electrically connected to the second sensor circuit, and is used for conditioning and analog-to-digital conversion of the signal collected by the second sensor circuit to obtain a corresponding digital signal;

The data sending circuit is electrically connected with the second main control circuit, and is used for receiving the signal sent by the wireless sending circuit and the digital signal output by the second main control circuit, and sending the signal to the data receiving device.

Exemplarily, both the first sensor circuit and the second sensor circuit include a plurality of data collection sensors, and the plurality of data collection sensors are respectively used to collect pressure signals at different positions of the sole of the measured object. In the embodiment of the present invention, as shown in FIG. 2-14, the number of data acquisition sensors in the first sensor circuit and the second sensor circuit are both 8, and film pressure sensors can be used in both, and the 8 film pressure sensors are The method of dividing voltage resistance detects the thumb area of the test object, the second to fifth toe area, the first second metatarsophalangeal joint area, the third and fourth metatarsophalangeal joint area, the fifth metatarsophalangeal joint area, the middle The pressure signals of the inner and outer sides of the foot, the inner side of the heel and the outer side of the heel, and the main control circuit can acquire the signals of the sensor circuit by means of array scanning.

Further, the first data unit and the second data acquisition unit, the first sensor circuit and the second sensor circuit are respectively arranged inside the first data unit and the second data acquisition unit. The first data unit and the second data acquisition unit are both insole, the insole is a three-layer structure, from bottom to top are foam layer, adhesive layer and cotton yarn layer, the first sensor circuit and the second sensor circuit are respectively arranged in in the adhesive layer of the first data unit and the second data acquisition unit. Electronics other than the sensor circuit can be soldered on the circuit board, and the circuit board can be placed in a device shaped like a shoe or the like.

In the embodiment of the present invention, both the first main control circuit and the second main control circuit include a main control chip, and the model of the main control chip is STM32F103C8T6, and the control chip can The analog signal is subjected to conditioning processing such as filtering and amplification, and the conditioned analog signal is converted into a digital signal.

In the embodiment of the present invention, a 10kΩ voltage divider resistor is connected in series with each film pressure sensor, so that the pins of the main control circuit (including the first main control circuit and the second main control circuit) can receive the film pressure The magnitude of the voltage output by the sensor. The PA0~PA7 pins of the main control chip are electrically connected with 8 thin film pressure sensors respectively to receive the analog signal collected by the thin film pressure sensor. The analog signal is converted by the conditioning module and ADC module inside the main control chip to output digital Signal. The wireless transmission circuit sends the sole data of one foot to the data transmission circuit arranged on the sole of the other foot. After receiving the digital signal output by the second main control circuit, the data transmission circuit packages the data and sends it wirelessly. , the data is received by a data receiving device such as a mobile phone or a PC.

The wireless transmission circuit can use the NRF24L01 chip, its pins 1, 2, 3, 4, 5 and 6 are respectively connected to the pins PB12, PB14, PB15, PB13, PA10 and PA8 of the main control chip, and the pins 7 and 8 are respectively connected to VCC3V3 and GND. The data transmission circuit includes ESP8066 chip and Bluetooth chip, of which the Bluetooth chip can use HC-05. The ESP8266 chip has an on-board PCB antenna, which is used to receive digital signals sent by the data transmission circuit. The ESP8266 chip can achieve the lowest power consumption and meet the power consumption requirements of mobile devices and wearable electronic products. At the same time, it can encode Reduce the output power, thereby reducing the power consumption of the overall product, and solve the problem of low power consumption required by smart wearables at this stage. The pins 1 and 5 of the ESP8266 chip are respectively connected to the pins TXD2 and RXD2 of the main control chip to receive digital signals sent by the wireless transmission circuit.

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

Exemplarily, the detection system of the present invention can be powered by a lithium battery, and the lithium battery can be charged through a power circuit, and the lithium battery can be a 5V 1500mAh battery. The power supply circuit can adopt a Type-c interface, which is convenient to connect with the charging device.

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

In a possible implementation manner, both the first main control circuit and the second main control circuit are electrically connected with a crystal oscillator circuit, and the crystal oscillator circuit is used to provide a clock signal to the first main control circuit and the second main control circuit.

Exemplarily, the main control chip needs to be connected to an external 8M crystal oscillator, and pins XTALA and XTALB of the crystal oscillator circuit are respectively connected to pins OSC_IN/PD0 and OSC_OUT/PD1 of the main control chip.

In a possible implementation manner, both the first main control circuit and the second main control circuit are electrically connected with a power indication circuit, and the power indication circuit is used to detect and indicate the power state of the first main control circuit and the second main control circuit .

Exemplarily, when the power circuit is normally connected, the red LED in the power indicating circuit is turned on to indicate the power state.

In a possible implementation manner, both the first main control circuit and the second main control circuit are electrically connected with a program download circuit, and the program download circuit is used for connecting with an external writing device to send the first main control circuit and the second main control circuit to the program download circuit. The main control circuit writes data.

Exemplarily, the program download circuit may use an asynchronous serial interface (UART1) and a serial debug interface (SWD) for an external writing device for communication and software code writing, respectively.

In the embodiment of the present invention, after the control program is written with Keil uVision5, the program downloader J-link can be used to connect the external writing device and the interface terminal of the program download circuit to burn the program.

In addition, it also includes a filter circuit, a data access circuit, a reset circuit and a mode selection circuit. The filter circuit includes a plurality of filter capacitors, which are used to filter the voltage output by the voltage conversion circuit to form a stable DC voltage. Its working principle is that when the rectified voltage is higher than the capacitor voltage, the capacitor is charged, and when the rectified voltage is lower than the capacitor voltage When the capacitor discharges, in the process of charging and discharging, the output voltage is basically stable.

The data access circuit is a reserved pin used to connect the expanded data acquisition sensor with the main control circuit when the number of data acquisition sensors needs to be expanded. A reset circuit is a circuit device used to restore a circuit to its starting state. The mode selection circuit can change the program writing state of the circuit by setting the state of BOOT0 and BOOT1.

The multiple electronic devices of the present invention are welded on the printed circuit board, and the design process of the printed circuit board using AltiumDesigner is as follows:

The first step is to update the schematic to the PCB. PCB is the conversion from theory to practice. The schematic diagram describes the network relationship between the pins of each device, while the PCB describes the size of the real thing and the arrangement of the lines.

The second step is to define the workspace, that is, to define the size of the circuit board. If other size structures are required, the size of the circuit board must be adjusted to suit the needs. If there are no other structure and size requirements, click on the mechanical layer (Mechanical 1), and then press the shortcut key PL to form a closed figure around the device. Press EOS to set the lower left corner as the coordinate origin, then press Shift to select multiple lines, and execute the shortcut key DSD to complete the setting of the workspace. Sometimes in order to prevent cutting fingers, chamfering is required, and the corners are drawn with arcs.

The third step is to place positioning holes, which play a fixed role in PCB production and patching. The positioning hole is generally a non-metallized via hole or a star-moon hole with a diameter of 3 mm.

The fourth step, the most important part of the whole link, is to carry out the layout operation. The layout is for better routing and improving the performance of the product. The specific method is: first, right-click next to the upper PCB file and select vertical division to interact with the schematic diagram, and arrange the disordered devices according to the modularity, and turn the whole into a module. After planning and thinking, the devices in the module are placed.

The fifth step is to perform plane setting and lamination production. The system defaults to two-layer boards. Press the shortcut key DK to enter the stack manager, right-click on the first layer and select add plane (negative layer) below. Two layers are added by default. You can modify the layer name for easy identification and click Save.

The sixth step, which is the wiring problem, is a very important part. The shortcut key PT is routed, and the route should not have an acute angle, preferably a 135° angle. Pay attention to the spacing between lines, try to meet the 3W principle (line spacing meets 3 times the line width) to avoid signal interference. Minimize the trace distance and loop area, and reduce the return path. The traces between layers should be as vertical as possible to avoid parallel. The power line should be thickened to increase the current carrying capacity, or connected by copper. The heat dissipation pads should be drilled with ground holes to dissipate heat.

The seventh step is to lay copper on the top and bottom layers as a whole, execute the shortcut key PR to delineate the copper laying area according to the board frame, and select the GND network property for the copper skin. The system will automatically avoid non-GND pads and place copper in the blank area. A large area of copper can reduce the ground return path and increase the anti-interference ability. More vias can be made in the blank to increase the connection between the surface layer and the bottom layer.

The eighth step is to adjust the silk screen. Silkscreen is the white ink that will be printed on the circuit board, including the part number of the device such as C11, R12, U6 and the shape of the device, version number and other marks.

The ninth step, the last and most important thing is to perform Design Rule Checking, which can check out some errors, such as short circuits, open circuits, and overlapping silkscreens. Press the shortcut key TD to enter the Design Rule Checker, and click Run DRC in the lower left corner to eliminate errors in the report.

As shown in Figure 15, the present invention uses software to control the work of the main control chip, and the specific operation process is as follows:

start;

Connect the lithium battery to power on, and turn on the switch;

The system enters self-test;

The main control chip is initialized;

Erase the sector and start writing data to the sector;

delay 20ms;

Collect sensor signals and encode;

delay 40ms;

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

Finish.

Although preferred embodiments of the present invention have been described, additional changes and modifications to these embodiments may occur to those skilled in the art once the basic inventive concepts are known. Therefore, the appended claims are intended to be construed to include the preferred embodiment and all changes and modifications that fall within the scope of the present invention.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these 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 these modifications and variations.

Claims (8)

1. a multi-channel plantar pressure monitoring system, is characterized in that, comprises: The first data acquisition device is used to collect the plantar pressure data of one foot of the tested object, and the first data acquisition device includes: The first sensor circuit is used to collect the plantar pressure signal of one foot of the tested object; a first main control circuit, electrically connected to the first sensor circuit, for conditioning and analog-to-digital conversion of the signal collected by the first sensor circuit to obtain a corresponding digital signal; a wireless sending circuit, electrically connected to the first main control circuit, for sending the digital signal output by the first main control circuit in the form of a wireless signal; The second data collection device is used to collect the plantar pressure data of the other foot of the tested object, and the second data collection device includes: The second sensor circuit is used to collect the plantar pressure signal of the other foot of the measured object; a second main control circuit, electrically connected to the second sensor circuit, for conditioning and analog-to-digital conversion of the signal collected by the second sensor circuit to obtain a corresponding digital signal; The data sending circuit is electrically connected with the second main control circuit, and is used for receiving the signal sent by the wireless sending circuit and the digital signal output by the second main control circuit, and sending the signal to the data receiving device. 2. a kind of multi-channel plantar pressure monitoring system according to claim 1, is characterized in that, also comprises: A first data unit and a second data acquisition unit, the first sensor circuit and the second sensor circuit are respectively arranged inside the first data unit and the second data acquisition unit. 3. A multi-channel plantar pressure monitoring system according to claim 2, wherein the first data unit and the second data acquisition unit are insole, and the insole is a three-layer structure, from bottom to top The foam layer, the adhesive layer and the cotton yarn layer are in sequence, and the first sensor circuit and the second sensor circuit are respectively arranged in the adhesive layer 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 both comprise a plurality of data acquisition sensors, and the plurality of data acquisition sensors respectively It is used to collect pressure signals at different positions on the sole of the object under test. 5. A multi-channel plantar pressure monitoring system according to claim 1, wherein 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 sending The first main control circuit and the second main control circuit are powered. 6 . The multi-channel plantar pressure monitoring system according to claim 1 , wherein the first main control circuit and the second main control circuit are both electrically connected with a crystal oscillator circuit, and the crystal oscillator circuit is used to send the The first main control circuit and the second main control circuit provide clock signals. 7 . The multi-channel plantar pressure monitoring system according to claim 1 , wherein 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 uses 7 . for detecting and indicating the power states of the first main control circuit and the second main control circuit. 8 . The multi-channel plantar pressure monitoring system according to claim 1 , wherein the first main control circuit and the second main control circuit are both electrically connected with a program download circuit, and the program download circuit uses 8 . It is connected with an external writing device to write data to the first main control circuit and the second main control circuit.

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