Array type flexible pressure sensor, data transmission method thereof and wearable equipment

Abstract

The invention relates to the technical field of sensors, and discloses an array type flexible pressure sensor and a data transmission method thereof, and a wearable device, the sensor comprises a flexible transverse conductive layer, a flexible longitudinal conductive layer, a flexible pressure-sensitive material layer, a data selector, a divider resistor and a single-chip microcomputer; the flexible transverse conductive layer is located at the top of the flexible pressure-sensitive material layer; the flexible longitudinal conductive layer is located at the bottom of the flexible pressure-sensitive material layer; a pressure-sensitive sensor is formed at the crossed position of the flexible longitudinal conducting layer and the flexible transverse conducting layer; the data selector is respectively connected with an output port of the flexible transverse conducting layer, an output port of the flexible longitudinal conducting layer and the single chip microcomputer; the divider resistor is connected with an output port of the flexible transverse conductive layer; the single-chip microcomputer is used for controlling the array type flexible pressure sensors to switch rows and columns and collecting voltage values between the pressure-sensitive sensors and the divider resistors. The method can be suitable for fabric pressure measurement and other scenes needing flexible sensing, and occupation of hardware resources is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to an array type flexible pressure sensor, a data transmission method thereof and a wearable device. BACKGROUND

[0002] The existing pressure sensor types mainly include resistance type, capacitance type, piezoelectric type and piezoresistance type, which can be divided into two types of supporting single-point pressure change measurement and array type pressure change measurement.

[0003] The array type sensor is generally stacked by M horizontal signals and N vertical signals to form an array size of M*N, and some media are added between the horizontal and vertical signal layers to make them sensitive to pressure. However, this design still has some problems. First, the material texture of the horizontal signal layer and the vertical signal layer is not soft, for example, the design of using plastic film plus copper strip. Although this design meets the requirements of array type, it cannot meet the requirements of some fabric pressure measurement such as cushion, insole and other scenarios that require flexible sensors. In addition, the size of the array type sensor is generally determined by the number of horizontal signals M and the number of vertical signals N. The most direct collection method at present is to use the M ADCs already on the single-chip microcomputer, connect M horizontal signals, and connect N vertical signals to the N free pins of the single-chip microcomputer, and control the conduction or non-conduction of the N pins by the single-chip microcomputer. However, the above scheme has a very large demand for single-chip microcomputer hardware resources, and the number of ADCs and the number of pins of the single-chip microcomputer directly limit the size of the sensor array. If a large pressure sensor array needs to be collected, either a single-chip microcomputer with more ADCs and pins but more expensive needs to be replaced, or an external ADC peripheral needs to be added, which is costly.

[0004] Therefore, the prior art still needs to be improved and developed. SUMMARY

[0005] In view of the above problems of the prior art, the present application aims to provide an array type flexible pressure sensor, a data transmission method thereof and a wearable device to solve the problems that the existing array sensor cannot meet the flexible sensing requirement and the cost of signal collection is high.

[0006] The technical scheme of the present application is as follows:

[0007] In a first aspect, the present application provides an array type flexible pressure sensor, which comprises: a flexible horizontal conductive layer, a flexible vertical conductive layer, a flexible pressure sensitive material layer, a data selector, a voltage dividing resistor and a single-chip microcomputer.

[0008] The flexible horizontal conductive layer is located on the top of the flexible pressure sensitive material layer.

[0009] The flexible longitudinal conductive layer is located at the bottom of the flexible pressure-sensitive material layer and staggered with the flexible transverse conductive layer; and the position where the flexible longitudinal conductive layer intersects with the flexible transverse conductive layer constitutes a pressure sensor;

[0010] The data selector is connected with the output port of the flexible transverse conductive layer, the output port of the flexible longitudinal conductive layer and the single-chip microcomputer respectively.

[0011] The voltage divider is connected with the output port of the flexible transverse conductive layer.

[0012] The single-chip microcomputer is used for controlling the flexible transverse conductive layer to switch rows and controlling the flexible longitudinal conductive layer to switch columns, and collecting the voltage value between the pressure sensor and the voltage divider.

[0013] Further arrangement of the present application, the flexible transverse conductive layer includes a flexible transverse film layer and a transverse conductive electrode; the transverse conductive electrode is spaced along the horizontal direction on the flexible transverse film layer.

[0014] Further arrangement of the present application, the flexible longitudinal conductive layer includes a flexible longitudinal film layer and a longitudinal conductive electrode; the longitudinal conductive electrode is spaced along the vertical direction on the flexible longitudinal film layer.

[0015] Further arrangement of the present application, the flexible transverse film layer includes a flexible cloth; the transverse conductive electrode includes a conductive cloth; the flexible longitudinal film layer includes a flexible cloth; and the longitudinal conductive electrode includes a conductive cloth.

[0016] Further arrangement of the present application, the flexible pressure-sensitive material layer is made of pressure-sensitive conductive foam material.

[0017] Further arrangement of the present application, the data selector includes a wide selector and a long selector; the wide selector is connected with the output end of the flexible longitudinal conductive layer; and the long selector is connected with the output end of the flexible transverse conductive layer.

[0018] Further arrangement of the present application, the array type flexible pressure sensor further includes a power module, a first serial port, a second serial port, a third serial port, a wide row female, a long row female, a wireless module and a Bluetooth module; wherein,

[0019] The power module is connected with the single-chip microcomputer and used for powering the single-chip microcomputer.

[0020] The first serial port is connected with the single-chip microcomputer and the wireless module respectively.

[0021] The second serial port is connected with the single-chip microcomputer and the Bluetooth module respectively.

[0022] The third serial port is connected with the single-chip microcomputer;

[0023] The wide-row mother is connected between the output end of the flexible transverse conductive layer and the wide selector.

[0024] The long-row mother is connected between the output end of the flexible longitudinal conductive layer and the long selector.

[0025] Further arrangement of the present application, the array type flexible pressure sensor further comprises: indicator light module, test lamp module, external clock module, reset module, download module and filter module, wherein,

[0026] The indicator light module is connected with the power module, for judging whether the power supply is normal.

[0027] The test lamp module is connected with the single-chip microcomputer, for testing the correctness of the single-chip microcomputer burning.

[0028] The external clock module is connected with the single-chip microcomputer, for providing clock for the single-chip microcomputer.

[0029] The reset module is connected with the single-chip microcomputer, for resetting the single-chip microcomputer.

[0030] The download module is connected with the single-chip microcomputer, for the program burning of the single-chip microcomputer.

[0031] The filter module is connected with the power module, for suppressing clutter.

[0032] Secondly, the present application further provides a data transmission method of the array type flexible pressure sensor, which comprises:

[0033] Establishing wireless communication connection between the array type flexible pressure sensor and the upper computer;

[0034] Real-time acquisition of pressure information of each pressure sensitive sensor and integration into pressure matrix information;

[0035] Sending the pressure matrix information to the upper computer for display.

[0036] Thirdly, the present application further provides a wearable device comprising the array type flexible pressure sensor.

[0037] The array type flexible pressure sensor provided by the application, a data transmission method thereof and a wearable device, the array type flexible pressure sensor comprises: a flexible transverse conductive layer, a flexible longitudinal conductive layer, a flexible pressure sensitive material layer, a data selector, a voltage dividing resistor and a single-chip microcomputer; the flexible transverse conductive layer is located on the top of the flexible pressure sensitive material layer; the flexible longitudinal conductive layer is located on the bottom of the flexible pressure sensitive material layer and is staggered with the flexible transverse conductive layer; the position where the flexible longitudinal conductive layer and the flexible transverse conductive layer cross constitutes a pressure sensitive sensor; the data selector is connected with the output port of the flexible transverse conductive layer, the output port of the flexible longitudinal conductive layer and the single-chip microcomputer respectively; the voltage dividing resistor is connected with the output port of the flexible transverse conductive layer; and the single-chip microcomputer is used for controlling the flexible transverse conductive layer to switch rows and controlling the flexible longitudinal conductive layer to switch columns, and collecting the voltage value between the pressure sensitive sensor and the voltage dividing resistor. The flexible transverse conductive layer, the flexible longitudinal conductive layer and the flexible pressure sensitive material layer of the flexible array pressure sensor provided by the application are all flexible material layers and have a certain deformation capacity, so the flexible array pressure sensor can be applied to fabric pressure measurement and other scenes requiring flexible sensing; and the flexible transverse conductive layer and the flexible longitudinal conductive layer are connected through the data selector, so that multiple signals can be switched to a single channel under the control of the single-chip microcomputer, so that the single-chip microcomputer only needs a small amount of IO ports to realize the collection of the array type flexible pressure sensor signals, greatly reducing the occupation of hardware resources and then reducing the cost. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and those skilled in the art can also obtain other drawings according to the structures shown in these drawings without any creative effort.

[0039] Figure 1 It is a structural schematic diagram of the flexible transverse conductive layer, the flexible transverse film layer and the flexible pressure sensitive material layer in an embodiment of the present application.

[0040] Figure 2 It is a structural schematic diagram of the array type flexible pressure sensor in an embodiment of the present application.

[0041] Figure 3 It is a schematic diagram of a signal collection circuit in the present application.

[0042] Figure 4 It is a circuit principle block diagram of the array type flexible pressure sensor in the present application.

[0043] Figure 5 It is a circuit principle diagram of the single-chip microcomputer in the present application.

[0044] Figure 6 is the circuit schematic of the power module and the filter module in one embodiment of the present application.

[0045] Figure 7 is the circuit schematic of the indication module and the test module in one embodiment of the present application.

[0046] Figure 8 is the circuit schematic of the external clock module and the reset module in one embodiment of the present application.

[0047] Figure 9 is the circuit schematic of the download module in one embodiment of the present application.

[0048] Figure 10 is the circuit schematic of the first serial port, the second serial port and the third serial port in one embodiment of the present application.

[0049] Figure 11 is the circuit schematic of the wide selector in one embodiment of the present application.

[0050] Figure 12 is the circuit schematic of the long selector in one embodiment of the present application.

[0051] Figure 13 is the circuit schematic of the voltage dividing resistor in one embodiment of the present application.

[0052] Figure 14 is the circuit schematic of the long row bus in one embodiment of the present application.

[0053] Figure 15 is the circuit schematic of the wide row bus in one embodiment of the present application.

[0054] Figure 16 is the flowchart of the data transmission method of the array type flexible pressure sensor of the present application.

[0055] Figure 17 is the flowchart of the data transmission method of the insole in one embodiment of the present application.

[0056] Figure 18 is the pressure distribution visualization data schematic in one embodiment of the present application.

[0057] In the drawings: 1, flexible transverse conductive layer; 11, flexible transverse film layer; 12, transverse conductive electrode; 2, flexible longitudinal conductive layer; 21, flexible longitudinal film layer; 22, longitudinal conductive electrode; 3, flexible pressure sensitive material layer; 4, data selector; 41, wide selector; 42, long selector; R, voltage dividing resistor; 6, single-chip microcomputer; 7, power module; 8, first serial port; 9, second serial port; 10, third serial port; 13, wide bus; 14, long bus; 15, wireless module; 16, Bluetooth module; 17, indicator light module; 18, test light module; 19, external clock module; 20, reset module; 23, download module; 24, filter module. DETAILED DESCRIPTION

[0058] The present application provides an array type flexible pressure sensor and a data transmission method thereof, and a wearable device. In order to make the purpose, technical solutions and effects of the present application more clear and explicit, the present application is further described in detail below with reference to the drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0059] In the embodiments and the patent application scope, unless the article is specifically limited in the text, "a", "an", "said" and "the" can also include plural forms. If the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0060] It should be further understood that the phrase "comprising" used in the specification of the present application means that the features, integers, steps, operations, elements and / or components exist, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, components and / or their combinations. It should be understood that when an element is said to be "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any single unit and all combinations of the associated listed items.

[0061] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art in the field of the present application. It should also be understood that terms such as those defined in a general dictionary should be interpreted as having a meaning consistent with the meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as such herein.

[0062] In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, also not within the scope of protection required by the present application.

[0063] The inventor found that the existing pressure sensor types can be divided into two types: single-point pressure change measurement and array pressure change measurement. In the physical circuit, the pressure sensor supporting single-point pressure change measurement usually appears as a combination of a single sensor plus two power lines and several signal lines. For the scene that needs to collect large-area and multi-point pressure, the configuration of this type of single-point sensor has obvious limitations. First, the circuit wiring becomes extremely complex, because each sensor needs independent power and signal lines, which not only increases the difficulty of wiring, but also may cause signal interference and transmission loss, and with the increase of the number of sensors, the cost of the system also increases significantly, because each sensor and its related circuit needs to be purchased and installed separately, and most importantly, due to the difficulty of large-scale arrangement of single-point sensors, it is difficult to accurately collect the specific pressure distribution of the measured object. For example, in the measurement of human sitting posture hip or foot pressure distribution, single-point sensors cannot capture the dynamic changes and local details of the pressure distribution, resulting in insufficient data accuracy.

[0064] Due to the above-mentioned limitations of the single-point sensor, it is difficult to meet the needs of some scenarios, and some array sensors have also appeared today. The array sensor is usually superimposed by M transverse signals and N longitudinal signals to form an array size of M*N, and some media are added between the transverse signal layer and the longitudinal signal layer to make it sensitive to pressure. However, this design still has some problems. First, the material texture of the transverse signal layer and the longitudinal signal layer is not soft, for example, a design using a plastic film plus a copper strip. Although this design meets the requirements of the array, it cannot meet the needs of some fabric pressure measurement such as seat cushions, insoles and other scenarios that require flexible sensors. Secondly, if the material thickness and volume of the transverse signal layer and the longitudinal signal layer are too thick and large, it will affect the array size under the condition of a certain area, limiting the density and accuracy of the sensor array. At the same time, the selection of this type of material will also increase the difficulty of manually manufacturing the sensor, because these materials need to be accurately processed and assembled to ensure the performance and reliability of the sensor.

[0065] In addition, the size of the array sensor is generally determined by the number of transverse signals M and the number of longitudinal signals N. The most direct current acquisition method is to use the M ADCs already on the single-chip microcomputer, connect M transverse signals, and connect N longitudinal signals to N free pins of the single-chip microcomputer, and control the conduction or non-conduction of the N pins by the single-chip microcomputer. However, the above-mentioned scheme has a very large demand for the hardware resources of the single-chip microcomputer, and the number of ADCs and the number of pins of the single-chip microcomputer directly limit the size of the sensor array. If a large pressure sensor array needs to be collected, either a single-chip microcomputer with more but more expensive ADCs and pins needs to be replaced, or external ADC peripherals need to be added, which is costly.

[0066] In view of the above technical problems, the present application provides an array flexible pressure sensor, a data transmission method thereof and a wearable device. The flexible transverse conductive layer, the flexible longitudinal conductive layer and the flexible pressure-sensitive material layer of the flexible array pressure sensor provided by the present application are all flexible material layers and have a certain deformation capability, and can be applied to scenarios such as fabric pressure measurement that require flexible sensing. In addition, the flexible transverse conductive layer and the flexible longitudinal conductive layer are connected through a data selector, and under the control of the single-chip microcomputer, multiple signals can be switched to a single channel, so that the single-chip microcomputer only needs a small number of IO ports to realize the collection of the array flexible pressure sensor signals, greatly reducing the occupation of hardware resources, and thus reducing the cost.

[0067] Please also refer to Figures 1 to 15 The present application provides a preferred embodiment of an array flexible pressure sensor.

[0068] In some embodiments, as Figures 1 to 3As shown, the present application provides an array flexible pressure sensor, which comprises: a flexible transverse conductive layer 1, a flexible longitudinal conductive layer 2, a flexible pressure sensitive material layer 3, a data selector 4, a voltage dividing resistor R and a single chip microcomputer 6; the flexible transverse conductive layer 1 is located on the top of the flexible pressure sensitive material layer 3; the flexible longitudinal conductive layer 2 is located on the bottom of the flexible pressure sensitive material layer 3 and is staggered with the flexible transverse conductive layer 1; the position where the flexible longitudinal conductive layer 2 crosses the flexible transverse conductive layer 1 constitutes a pressure sensitive sensor; the data selector 4 is connected with the output port of the flexible transverse conductive layer 1, the output port of the flexible longitudinal conductive layer 2 and the single chip microcomputer 6 respectively; the voltage dividing resistor R is connected with the output port of the flexible transverse conductive layer 1; the single chip microcomputer 6 is used for controlling the flexible transverse conductive layer 1 to switch rows and controlling the flexible longitudinal conductive layer 2 to switch columns, and collecting the voltage value between the pressure sensitive resistor and the voltage dividing resistor R.

[0069] In the embodiment, the flexible transverse conductive layer 1 and the flexible longitudinal conductive layer 2 are located on both sides of the flexible pressure sensitive resistor layer and are attached to the flexible pressure sensitive resistor layer, forming a pressure sensitive resistor structure of “flexible transverse conductive layer 1, flexible pressure sensitive material layer 3, flexible longitudinal conductive layer 2”. And the flexible transverse conductive layer 1 and the flexible longitudinal conductive layer 2 are staggered, so that an array pressure sensor matrix can be obtained. The data selector 4 is connected with the output port of the flexible transverse conductive layer 1, the output port of the flexible longitudinal conductive layer 2 and the single chip microcomputer 6 respectively, the data selector 4 switches multiple signals to a single channel through time division multiplexing, and the data selector 4 switches rows of the flexible transverse conductive layer 1 and columns of the flexible longitudinal conductive layer 2 under the control of the single chip microcomputer 6, so that the pressure signal of each pressure sensitive sensor can be collected and the pressure matrix information can be obtained. The information collection principle is: during the collection process, the single chip microcomputer 6 first controls the data selector 4 to select the first row of the array, then switches column by column, and sequentially collects the voltage value between each pressure sensitive sensor and the voltage dividing resistor R in the row; after the first row is collected, the second row is switched, and the above-mentioned column-by-column collection process is repeated, and so on, until all the voltage values of all the pressure sensitive sensors in the pressure sensitive array are collected, and the collected voltage data array is stored in the internal memory unit of the single chip microcomputer 6 in the form of two-dimensional array.

[0070] In the above technical solution, the flexible transverse conductive layer 1, the flexible longitudinal conductive layer 2, and the flexible pressure-sensitive material layer 3 of the flexible array pressure sensor are all flexible material layers and have a certain deformation capability, which can be applied to fabric pressure measurement and other scenarios requiring flexible sensing, such as insoles, seat cushions, mattress, etc., solving the problem that traditional sensor arrays are difficult to adapt to complex shapes and flexible requirements, and improving the applicability and flexibility of the sensor array, so that it can be widely applied to various scenarios requiring large-area and multi-point pressure detection. Moreover, the flexible transverse conductive layer 1 and the flexible longitudinal conductive layer 2 are connected through the data selector 4, and under the control of the single-chip microcomputer 6, the multi-channel signals can be switched to a single channel, so that the single-chip microcomputer 6 only needs a small number of IO ports to realize the collection of the array flexible pressure sensor signals, greatly reducing the occupation of hardware resources. The single-chip microcomputer 6 uses a built-in ADC unit to collect voltage signals, so that only 1 ADC unit and log2M single-chip microcomputer 6 pins can complete M row collection, and only log2N single-chip microcomputer 6 pins can complete N column collection, greatly saving hardware resources and reducing hardware cost, while greatly expanding the size of the collectable array under limited single-chip microcomputer 6 resources.

[0071] In some embodiments, referring to Figure 1 With Figure 2 , the flexible transverse conductive layer 1 includes a flexible transverse film layer 11 and a transverse conductive electrode 12; the transverse conductive electrode 12 is distributed on the flexible transverse film layer 11 in a horizontal direction.

[0072] The flexible longitudinal conductive layer 2 includes a flexible longitudinal film layer 21 and a longitudinal conductive electrode 22; the longitudinal conductive electrode 22 is distributed on the flexible longitudinal film layer 21 in a vertical direction.

[0073] In the embodiment, the base of the flexible transverse conductive layer 1 and the flexible longitudinal conductive layer 2 is a flexible film layer, which can be flexible cloth, such as cotton cloth, wiping cloth, etc. In an implementation, the transverse conductive electrode 12 and the longitudinal conductive electrode 22 are both conductive cloth. In other implementations, the flexible conductive electrode and the longitudinal conductive electrode 22 can also be conductive electrodes made of conductive fibers and nano-conductive ink.

[0074] The flexible transverse conductive electrodes 12 are arranged on the flexible transverse film layer 11 in horizontal direction. The flexible longitudinal conductive electrodes 22 are arranged on the flexible longitudinal film layer 21 in vertical direction. The width and number of the flexible transverse conductive electrodes 12 and the flexible longitudinal conductive electrodes 22 and the interval can be determined according to actual situation, so that the density and size of the arrayed flexible pressure sensor can be determined freely. In an implementation, the width of the flexible transverse conductive electrodes 12 and the interval between two flexible transverse conductive electrodes 12 are equal, and the width of the flexible conductive electrodes and the interval between two flexible longitudinal conductive electrodes 22 are equal.

[0075] The flexible transverse conductive electrodes 12 and the flexible longitudinal conductive electrodes are connected to the data selector 4 through lines to realize the collection of the voltage signal of the pressure sensor. The pressure sensor and the pressure resistance, the resistance value of the pressure resistance decreases with the increase of the applied pressure, the number of columns of the pressure sensor array is determined by the number of the flexible longitudinal conductive electrodes 22 distributed in longitudinal direction, and the number of rows of the pressure sensor is determined by the number of the flexible transverse conductive electrodes 12 distributed in transverse direction.

[0076] In some embodiments, the flexible pressure sensitive material layer 3 is made of pressure sensitive conductive foam material.

[0077] In the embodiment, the flexible pressure sensitive material layer 3 is made of pressure sensitive conductive foam material (Valostat), which is a pressure sensitive material with linearly changed resistance value with pressure. The shape of the flexible pressure sensitive material layer 3 can be cut according to actual product, for example, the arrayed flexible pressure sensor is applied to insole, the shape of the flexible pressure sensitive material layer 3 is cut to the shape and size of corresponding shoe size, and the shape of the flexible transverse conductive layer 1 and the flexible longitudinal conductive layer 2 is adapted to the shape of the flexible pressure sensitive material layer 3.

[0078] In some embodiments, please refer to Figure 1 and Figure 2 The data selector 4 includes a width selector 41 and a length selector 42. The width selector 41 is connected to the output end of the flexible transverse conductive layer 1. The length selector 42 is connected to the output end of the flexible longitudinal conductive layer 2.

[0079] In the embodiment, the data selector 4 comprises a width selector 41 and a length selector 42, which are connected with the flexible longitudinal conductive electrodes 22 and the flexible transverse conductive electrodes 12 through wires. The width selector 41 and the length selector 42 each have an enable terminal connected with the single-chip microcomputer 6, so that the working state of the width selector 41 and the length selector 42 is controlled by the single-chip microcomputer 6. The address pins of the width selector 41 and the length selector 42 are connected with the single-chip microcomputer 6, and the GPIO of the single-chip microcomputer 6 can control the address pins of the width selector 41 and the length selector 42 to switch the rows and columns in the sensor array. In an implementation, the embodiment adopts a 16-way multiplexer, for example, a CD74HC4067 (16-channel analog multiplexer), and the address pins (S0-S3) of the multiplexer are controlled by the GPIO of the single-chip microcomputer 6 to switch the rows and columns. When the length selector 42 adopts a 16-way multiplexer, the circuit principle diagram of the voltage dividing resistor R is as shown in Figure 5

[0080] In some embodiments, referring to Figures 4 to 15 , the array-type flexible pressure sensor further comprises a power module 7, a first serial port 8, a second serial port 9, a third serial port 10, a width bus 13, a length bus 14, a wireless module 15, and a Bluetooth module 16; the power module 7 is connected with the single-chip microcomputer 6 and used to supply power for the single-chip microcomputer 6; the first serial port 8 is connected with the single-chip microcomputer 6 and the wireless module 15 respectively; the second serial port 9 is connected with the single-chip microcomputer 6 and the Bluetooth module 16 respectively; the third serial port 10 is connected with the single-chip microcomputer 6; the width bus 13 is connected between the output end of the flexible transverse conductive layer 1 and the width selector 41; and the length bus 14 is connected between the output end of the flexible longitudinal conductive layer 2 and the length selector 42.

[0081] In the embodiment, the width bus 13 is an interface for connecting the flexible transverse conductive layer 1, and the length bus 14 is an interface for connecting the flexible longitudinal conductive layer 2. The width bus 13 and the length bus 14 are connected with the pressure sensor array and then connected with the data selector 4.

[0082] ​The power module 7 supplies power to the single-chip microcomputer 6 through a USB interface and further uses a voltage reduction unit to reduce the voltage of an externally connected 5V power supply to 3.3V for use by the single-chip microcomputer 6. The first serial port 8 is an expansion serial port of the wireless module 15, and the array-type flexible pressure sensor can send the collected pressure matrix information to an upper computer through the wireless module 15. The wireless module 15 can be a WIFI module, a ZigBee module, a LoRa module, an NB-IoT module, etc. This embodiment takes the WIFI module as an example for illustration. The WIFI module is a wireless UART serial port, in which the baud rate of the WIFI is 921600. The baud rate is designed in this way to quickly transmit matrix data and improve the acquisition frame rate.

[0083] The second serial port 9 is an expansion serial port of the Bluetooth module 16, and the array-type flexible pressure sensor can establish communication with the upper computer through the Bluetooth module 16. The third serial port 10 is a backup serial port, which can be connected to other expansion modules.

[0084] It should be noted that most pressure sensor arrays can only perform static measurement, i.e., record the pressure distribution at a certain time, and cannot capture dynamic changes. For example, in sports science research, researchers need to understand the real-time changes of the foot pressure of athletes during running, jumping and other actions to analyze their movement posture and force conditions. Static measurement cannot meet this demand. In addition, the data collected by existing pressure sensors are usually first stored on a local hard disk and then transmitted to a computer through the hard disk for analysis. The above transmission method not only consumes time and effort, but also has the risk of data loss and damage. In the case of a large amount of data, the limited storage space of the hard disk may cause the data to be unable to be saved completely, affecting subsequent data analysis and research work. In this embodiment, when data transmission is performed, the Bluetooth module 16 and the WIFI module can be used to realize data transmission with the upper computer, which not only can realize real-time data transmission, but also can realize dynamic measurement.

[0085] In some embodiments, referring to Figures 4 to 15 , the array-type flexible pressure sensor further includes an indicator light module 17, a test light module 18, an external clock module 19, a reset module 20, a download module 23 and a filter module 24. The indicator light module 17 is connected with the power module 7 and is used to determine whether the power supply is normal. The test light module 18 is connected with the single-chip microcomputer 6 and is used to test the correctness of the single-chip microcomputer 6. The external clock module 19 is connected with the single-chip microcomputer 6 and is used to provide a clock for the single-chip microcomputer 6. The reset module 20 is connected with the single-chip microcomputer 6 and is used to reset the single-chip microcomputer 6. The download module 23 is connected with the single-chip microcomputer 6 and is used for program burning of the single-chip microcomputer 6. The filter module 24 is connected with the power module 7 and is used to suppress noise.

[0086] In the embodiment, the indicator light module 17 is connected with the power module 7, and the indicator light is lit when the 3.3V power supply is accessed, so that it can be used to determine whether the power supply is normal according to the on-off state of the indicator light. The test lamp module 18 is connected with the test pin of the single-chip microcomputer 6, and can test the correctness of the single-chip microcomputer 6 when programming. The external clock module 19 can provide the necessary clock signal for the single-chip microcomputer 6. The reset module 20 is connected with the reset pin of the single-chip microcomputer 6, and can reset the single-chip microcomputer 6. The download module 23 is an interface connected with the single-chip microcomputer 6, and can realize the programming of the single-chip microcomputer 6. The filter module 24 is connected with the power pin of the single-chip microcomputer 6, and can suppress the noise of the power supply voltage provided by the power module 7, so as to ensure the stable output of the power supply provided by the power module 7 to the single-chip microcomputer 6.

[0087] In some embodiments, as shown in Figure 16 The application also provides a data transmission method of the array type flexible pressure sensor, which comprises the following steps:

[0088] S100, establishing a wireless communication connection between the array type flexible pressure sensor and the host computer;

[0089] Specifically, after the array type flexible pressure sensor is powered on, the hardware device is first initialized, and then connected with the host computer through WIFI, and the connection time can be set to 7-12 seconds, and generally set to 10 seconds. S200, collecting the pressure information of each pressure sensor in real time and integrating into pressure matrix information;

[0090] Specifically, after the initialization is completed, the ADC unit built in the single-chip microcomputer starts to collect the pressure signal of each pressure sensor, and further integrates into the pressure matrix information.

[0091] S300, sending the pressure matrix information to the host computer for display.

[0092] Specifically, after the collection and integration of the pressure information are completed, the pressure matrix information is sent to the host computer, such as a mobile phone or a tablet computer, through the UDP port of the WIFI module. The host computer has a Matplot visualization library, which can create a real-time rendering system, display a pressure heat map, and dynamically update the image with a preset time length, such as a refresh cycle of 50ms, to ensure the integrity and accuracy of the data. After the pressure heat map is displayed, the pressure information of the array type flexible pressure sensor is repeatedly collected to ensure the continuity and real-time performance of the data.

[0093] As shown in Figure 17As shown, taking the insole with a pressure sensor array having 28*10 (i.e., 28 conductive cloths are attached transversely, 10 conductive cloths are attached longitudinally, and a layer of pressure-sensitive material is interposed, thereby forming a customized flexible sensor array with an array spacing of 5mm*5mm and an array size of 28*10, which is connected to the data selector through a wire) as an example, two insoles collect data of an array with a size of 28*20 per frame and transmit the data to the PC wirelessly, the frame rate is currently 4-5 frames, the width of the conductive electrode is 5mm, and the interval is 5mm. The left and right insoles are powered on at the same time, after initialization is completed and the WIFI of the host computer is connected, the single-chip microcomputer starts collecting pressure information and integrates the pressure information into a pressure matrix. After the left and right insoles collect and integrate the pressure information, the pressure information matrix is sent to the host computer through the respective UDP ports through the WIFI module. The host computer creates two independent receiving threads through a multi-thread mechanism, monitors the data stream of the two UDP ports in real time, and stores the received pressure matrix information in the respective queues. Subsequently, the host computer uses the Matplot visualization library to create a double-window real-time rendering system and display the pressure heat maps of the left and right insoles, respectively, as shown in Figure 18 wherein Figure 18 a in the above figure represents left foot pressure distribution visualization data, Figure 18 b in the above figure represents right foot pressure distribution visualization data, and the image is dynamically updated at a refresh period of 20ms through a timer, realizing end-to-end real-time processing from data collection to visualization. The system adopts a multi-thread architecture to ensure data isolation and efficient processing and supports the access of more Internet of Things devices in the future.

[0094] In this embodiment, the multi-thread mechanism is combined with the visualization module to ensure the efficiency and real-time performance of the system and provide good architectural support for the access of more Internet of Things devices in the future.

[0095] In some embodiments, the present application also provides a wearable device comprising the array-type flexible pressure sensor as described above. Details are described in the embodiment of the array-type flexible pressure sensor, which will not be repeated here.

[0096] In summary, the array-type flexible pressure sensor, the data transmission method thereof, and the wearable device provided by the present application have the following beneficial effects:

[0097] The flexible transverse conductive layer, the flexible longitudinal conductive layer, and the flexible pressure-sensitive material layer of the flexible array pressure sensor are all flexible material layers and have a certain deformation ability, which can be applied to fabric pressure measurement and other scenarios requiring flexible sensing, solving the problem that traditional sensor arrays are difficult to adapt to complex shapes and flexible requirements, and improving the applicability and flexibility of the sensor array, so that it can be widely applied to various scenarios requiring large-area and multi-point pressure detection.

[0098] The flexible transverse conductive layer and the flexible longitudinal conductive layer are connected through the data selector, under the control of the single-chip microcomputer, multiple signals can be switched to a single channel, so that the single-chip microcomputer only needs a small amount of IO port to realize the acquisition of the array type flexible pressure sensor signal, greatly reduces the occupation of hardware resources, reduces the hardware cost, and greatly expands the size of the collectable array under the limited single-chip microcomputer resources;

[0099] When data transmission is performed, data transmission with the upper computer can be realized through the Bluetooth module and the WIFI module, not only the real-time transmission of data can be realized, but also dynamic measurement can be realized.

[0100] It should be understood that the application of the present application is not limited to the above examples, and those skilled in the art can make improvements or changes according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An array-type flexible pressure sensor, characterized in that: include: Flexible transverse conductive layer, flexible longitudinal conductive layer, flexible pressure-sensitive material layer, data selector, voltage divider resistor and single chip microcomputer; The flexible transverse conductive layer is located on top of the flexible pressure-sensitive material layer; The flexible longitudinal conductive layer is located at the bottom of the flexible pressure-sensitive material layer and is staggered with the flexible transverse conductive layer; the intersection of the flexible longitudinal conductive layer and the flexible transverse conductive layer forms a pressure-sensitive sensor; The data selector is connected to the output port of the flexible transverse conductive layer, the output port of the flexible longitudinal conductive layer and the single chip microcomputer respectively; The voltage dividing resistor is connected to the output port of the flexible transverse conductive layer; The single chip microcomputer is used to control the flexible transverse conductive layer to switch rows and the flexible longitudinal conductive layer to switch columns, and to collect the voltage value between the pressure sensitive sensor and the voltage divider resistor.

2. The array-type flexible pressure sensor according to claim 1, characterized in that: The flexible transverse conductive layer includes a flexible transverse film layer and transverse conductive electrodes; the transverse conductive electrodes are distributed on the flexible transverse film layer at intervals along the horizontal direction.

3. The array-type flexible pressure sensor according to claim 2, characterized in that: The flexible longitudinal conductive layer includes a flexible longitudinal film layer and longitudinal conductive electrodes; the longitudinal conductive electrodes are distributed on the flexible longitudinal film layer at intervals along the vertical direction.

4. The array-type flexible pressure sensor according to claim 3, characterized in that: The flexible transverse film layer comprises flexible cloth; the transverse conductive electrode comprises conductive cloth; the flexible longitudinal film layer comprises flexible cloth; and the longitudinal conductive electrode comprises conductive cloth.

5. The array-type flexible pressure sensor according to claim 1, characterized in that: The flexible pressure-sensitive material layer is made of pressure-sensitive conductive foam material.

6. The array-type flexible pressure sensor according to claim 1, characterized in that: The data selector includes: a wide selector and a long selector; the wide selector is connected to the output end of the flexible longitudinal conductive layer; the long selector is connected to the output end of the flexible transverse conductive layer.

7. The array-type flexible pressure sensor according to claim 6, characterized in that: It also includes a power module, a first serial port, a second serial port, a third serial port, a wide female header, a long female header, a wireless module and a Bluetooth module; wherein, The power supply module is connected to the single chip microcomputer and is used to supply power to the single chip microcomputer; The first serial port is connected to the single chip microcomputer and the wireless module respectively; The second serial port is connected to the single chip microcomputer and the Bluetooth module respectively; The third serial port is connected to the single chip microcomputer; The wide busbar is connected between the output end of the flexible transverse conductive layer and the wide selector; The long female row is connected between the output end of the flexible longitudinal conductive layer and the long selector.

8. The array-type flexible pressure sensor according to claim 7, characterized in that: Also includes: Indicator light module, test light module, external clock module, reset module, download module and filter module; among them, The indicator light module is connected to the power supply module and is used to determine whether the power supply is normal; The test light module is connected to the single chip microcomputer and is used to test the correctness of the single chip microcomputer programming; The external clock module is connected to the single chip microcomputer and is used to provide a clock for the single chip microcomputer; The reset module is connected to the single chip microcomputer and is used to reset the single chip microcomputer; The download module is connected to the single chip microcomputer and is used for burning the program of the single chip microcomputer; The filter module is connected to the power module and is used to suppress clutter.

9. A data transmission method for an array-type flexible pressure sensor according to any one of claims 1 to 8, characterized in that: include: Establishing wireless communication connection between array flexible pressure sensor and host computer; Collect pressure information from each pressure-sensitive sensor in real time and integrate it into pressure matrix information; The pressure matrix information is sent to the host computer for display.

10. A wearable device, characterized in that: It comprises the array-type flexible pressure sensor according to any one of claims 1 to 8.

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