CN111248914B - Plantar pressure acquisition system - Google Patents
Plantar pressure acquisition system Download PDFInfo
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- CN111248914B CN111248914B CN202010058559.5A CN202010058559A CN111248914B CN 111248914 B CN111248914 B CN 111248914B CN 202010058559 A CN202010058559 A CN 202010058559A CN 111248914 B CN111248914 B CN 111248914B
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1036—Measuring load distribution, e.g. podologic studies
- A61B5/1038—Measuring plantar pressure during gait
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/205—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using distributed sensing elements
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Abstract
The application relates to a plantar pressure collection system, which comprises: the film pressure sensor is used for acquiring a current sole pressure signal; the signal processing unit is used for converting the current sole pressure signal into a current sole voltage signal; and the controller is used for acquiring the current sole pressure value according to the current sole voltage signal. The application provides a technical scheme, not only can be accurate acquire the sole pressure value, small dress is convenient moreover, and the cost is with low costs.
Description
Technical Field
The application belongs to the technical field of wearable intelligent equipment, and particularly relates to a plantar pressure acquisition system.
Background
In the walking process of a person, the pressure distribution condition of the soles is time-varying, the research on the pressure distribution of the soles is of great significance for walking gait analysis, and particularly has an important guiding effect on patients suffering from leg and foot movement dysfunction (such as lameness and limb disability).
The related technology comprises a dot matrix contact force sensing type human body plantar pressure distribution measuring system which is developed by adopting novel conductive rubber as a sensor material, a sensor array which is formed by a plurality of miniature pressure sensors and the like, but the related technology generally has the problems of large product volume, inconvenient wearing or high manufacturing cost.
Disclosure of Invention
In order to overcome the problems of large product volume, inconvenient wearing or high manufacturing cost in the related technology at least to a certain extent, the application provides a plantar pressure acquisition system.
According to a first aspect of embodiments of the present application, there is provided a plantar pressure acquisition system, the system including:
the film pressure sensor is used for acquiring current plantar pressure signals;
the signal processing unit is used for converting the current sole pressure signal into a current sole voltage signal;
and the controller is used for acquiring a current sole pressure value according to the current sole voltage signal.
Preferably, the signal processing unit includes: the device comprises a plurality of reference resistors and a plurality of analog-to-digital conversion modules;
the analog-to-digital conversion modules are used for converting the current plantar pressure signal into a current plantar pressure signal.
Further, the number of the reference resistors is the same as that of the analog-to-digital conversion modules;
all the reference resistors have the same resistance value.
Further, in the above-mentioned case,
one end of each reference resistor is connected with one output end of the film pressure sensor, and the other end of each reference resistor is connected with the controller;
the connection point between each reference resistor and the output end of the film pressure sensor is connected with the input end of one analog-to-digital conversion module;
the output end of the analog-to-digital conversion module is connected with the controller;
the output end of the film pressure sensor which is not connected with the reference resistor is connected with the controller.
Preferably, the controller includes:
the first acquisition module is used for acquiring the resistance value of a pressure sensitive area in the current thin film pressure sensor by using a polling method according to the current sole voltage signal;
and the second acquisition module is used for inputting the resistance value of the pressure sensitive area in the current film pressure sensor into a preset function and acquiring the current sole pressure value corresponding to the pressure sensitive area in the current film pressure sensor.
Further, the first obtaining module includes:
a first determination submodule for making a connection point between the reference resistance and the controller be P a ；
The connection point between the output end of the film pressure sensor and the controller is P b ；
Wherein a ∈ [1, A ], A is the total number of connection points between the reference resistance and the controller; b e [1, B ], B being the total number of connection points between the reference resistance and the controller;
a first selection submodule for selecting a connection point P between the output of the membrane pressure sensor and the controller d Inputting high level for output port;
selecting a connection point P between the reference resistor and the controller c Inputting low level for output port;
wherein d belongs to [1, B ] and d is not equal to b, c belongs to [1, A ] and c is not equal to a;
a second selection submodule for selecting a connection point P between the other reference resistors and the controller a Is in a high resistance state;
selecting a connection point P between the output ends of the other film pressure sensors and the controller b Is in a high resistance state;
the first acquisition submodule is used for acquiring the resistance value of an effective pressure sensitive area connected with the analog-to-digital conversion module in the film pressure sensor, and the resistance value of the effective pressure sensitive area connected with the analog-to-digital conversion module in the film pressure sensor is made to be the resistance value of the pressure sensitive area in the current film pressure sensor;
the judging submodule is used for judging whether the resistance values of all the pressure sensitive areas in the current film pressure sensor are completely acquired, and if so, outputting the resistance values of all the pressure sensitive areas in the current film pressure sensor;
if not, reselecting a connection point P between the output end of the film pressure sensor and the controller d Inputting high level for output port; reselecting a connection point P between the reference resistor and the controller c Inputting low level for output port; until the resistance values of all pressure sensitive areas in the current film pressure sensor are all obtained.
Go toThe first obtaining submodule is specifically configured to determine a resistance value R of a jth effective pressure sensitive area connected to the analog-to-digital conversion module in the thin film pressure sensor according to the following formula j ：
In the above formula, i is E [1, N]N is the total number of the analog-to-digital conversion modules; j is an element of [1, M ]]M is the total number of pressure sensitive areas in the film pressure sensor; u shape V Is a voltage value of the high level, U i The resistance value between the ith analog-to-digital conversion module and the film pressure sensor is obtained; u shape g Is the connection point P d A resistance value with the thin film pressure sensor; r k Is a connection point P c The corresponding resistance value of the reference resistor.
Further, the second obtaining module includes:
the second acquisition submodule is used for acquiring a preset function by using a data fitting method according to the resistance value of a pressure sensitive area in the historical film pressure sensor and the corresponding plantar pressure value of the pressure sensitive area in the historical film pressure sensor;
and the third obtaining submodule is used for inputting the resistance value of the pressure sensitive area in the current film pressure sensor into a preset function and obtaining the current sole pressure value corresponding to the pressure sensitive area in the current film pressure sensor.
Preferably, the system further comprises: and the power supply unit is used for supplying power to the plantar pressure acquisition system.
Preferably, the system further comprises: and the communication unit is used for transmitting the current sole pressure value acquired by the controller to a receiving terminal.
The technical scheme provided by the embodiment of the application can have the following beneficial effects:
the plantar pressure acquisition system constructed by the film pressure sensor, the signal processing unit and the controller not only can accurately acquire the plantar pressure value, but also has small volume, convenient wearing and low manufacturing cost, and is beneficial to the development of medical services.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a plantar pressure acquisition system according to an exemplary embodiment;
FIG. 2 is a schematic diagram of another plantar pressure acquisition system shown in accordance with an exemplary embodiment;
FIG. 3 is a schematic diagram of another plantar pressure acquisition system shown in accordance with an exemplary embodiment;
FIG. 4 is a schematic diagram illustrating the distribution of pressure sensitive areas in a membrane pressure sensor in another plantar pressure acquisition system according to one exemplary embodiment;
FIG. 5 is a schematic diagram of another embodiment of a membrane pressure sensor for a plantar pressure acquisition system;
FIG. 6 is a schematic diagram illustrating an equivalent resistance network in another plantar pressure acquisition system according to an exemplary embodiment;
fig. 7 is a schematic structural diagram of another plantar pressure acquisition system according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
Fig. 1 is a schematic structural diagram illustrating a plantar pressure collection system according to an exemplary embodiment, as shown in fig. 1, the system including:
the film pressure sensor is used for acquiring current plantar pressure signals;
the signal processing unit is used for converting the current sole pressure signal into a current sole voltage signal;
and the controller is used for acquiring the current sole pressure value according to the current sole voltage signal.
The embodiment provides a plantar pressure collection system, the plantar pressure value that not only can be accurate, it is convenient that small dress moreover, and the cost is with low costs, helps the development of medical treatment.
As an improvement of the above embodiment, an embodiment of the present invention provides another structural schematic diagram of a plantar pressure collecting system, as shown in fig. 2, including:
the film pressure sensor is used for acquiring current plantar pressure signals;
the signal processing unit is used for converting the current sole pressure signal into a current sole voltage signal;
and the controller is used for acquiring the current sole pressure value according to the current sole voltage signal.
It will be readily appreciated that a thin film pressure sensor includes a number of pressure sensitive areas, each pressure sensitive area being equivalent to a variable resistance.
It should be noted that the number of pressure sensitive areas in the film pressure sensor can be set by a person skilled in the art according to experience or engineering requirements.
It is easily understood that the plantar pressure collection system provided by the application is arranged in a shoe, and can be arranged below an insole, above the insole or in the insole.
Further optionally, the signal processing unit includes: a plurality of reference resistors and a plurality of analog-to-digital conversion modules;
and the analog-to-digital conversion modules are used for converting the current sole pressure signal into a current sole voltage signal.
It is easy to understand that the analog-to-digital conversion module converts the current plantar pressure signal from an analog quantity to a digital quantity so that the controller can identify the current plantar pressure signal.
It should be noted that, when measuring the pressure value of the sole of a foot, a reference is needed, and the reference resistance is used as a comparison quantity; the resistance of the reference resistor can be set by one skilled in the art according to engineering requirements or experimental data.
It should be noted that the "analog-to-digital conversion module" referred to in this embodiment is well known to those skilled in the art, and therefore, the specific implementation manner thereof is not described too much.
Further optionally, the number of the reference resistors is the same as the number of the analog-to-digital conversion modules;
all the reference resistors have the same resistance.
For example, the reference resistor has a resistance of 300K Ω.
Further optionally, one end of each reference resistor is connected with one output end of the film pressure sensor, and the other end of each reference resistor is connected with the controller;
the connection point between each reference resistor and the output end of the film pressure sensor is connected with the input end of one analog-to-digital conversion module;
the output end of the analog-to-digital conversion module is connected with the controller;
the output end of the film pressure sensor which is not connected with the reference resistor is connected with the controller.
Further optionally, the controller comprises:
the first acquisition module is used for acquiring the resistance value of a pressure sensitive area in the current thin film pressure sensor by using a polling method according to the current sole voltage signal;
the second acquisition module is used for inputting the resistance value of the pressure sensitive area in the current film pressure sensor into a preset function and acquiring the current plantar pressure value corresponding to the pressure sensitive area in the current film pressure sensor;
it should be noted that the "polling method" referred to in the present embodiment is well known to those skilled in the art, and therefore, the specific implementation manner thereof is not described too much.
Further optionally, the first obtaining module includes:
a first determination submodule for setting a connection point between the reference resistor and the controller to be P a ；
The connection point between the output end of the film pressure sensor and the controller is P b ；
Wherein a belongs to [1, A ], A is the total number of connection points between the reference resistor and the controller; b belongs to [1, B ], B is the total number of connection points between the reference resistor and the controller;
a first selection submodule for selecting a connection point P between the output of the membrane pressure sensor and the controller d Inputting high level for output port;
selecting a connection point P between a reference resistor and a controller c Inputting low level for output port;
wherein d belongs to [1, B ] and d is not equal to b, c belongs to [1, A ] and c is not equal to a;
a second selection submodule for selecting a connection point P between the other reference resistor and the controller a Is in a high resistance state;
selecting a connection point P between the output end of other film pressure sensor and the controller b Is in a high resistance state;
the first acquisition sub-module is used for acquiring the resistance value of an effective pressure sensitive area connected with the analog-to-digital conversion module in the film pressure sensor and enabling the resistance value of the effective pressure sensitive area connected with the analog-to-digital conversion module in the film pressure sensor to be the current resistance value of the pressure sensitive area in the film pressure sensor;
the judgment submodule is used for judging whether the resistance values of all the pressure sensitive areas in the current film pressure sensor are completely obtained or not, and if yes, outputting the resistance values of all the pressure sensitive areas in the current film pressure sensor;
if not, reselecting a connection point P between the output end of the film pressure sensor and the controller d Inputting high level for output port; reselecting a connection point P between a reference resistor and the controller c Inputting low level for output port; up to all of the current diaphragm pressure sensorsThe resistance values of the pressure sensitive areas are all obtained.
Further optionally, the first obtaining sub-module is specifically configured to determine a resistance value R of a jth effective pressure sensitive area connected to the analog-to-digital conversion module in the film pressure sensor according to the following formula j ：
In the above formula, i is E [1, N]N is the total number of the analog-to-digital conversion modules; j is an element of [1, M ]]M is the total number of pressure sensitive areas in the film pressure sensor; u shape V At a high level of voltage value, U i The resistance value between the ith analog-to-digital conversion module and the film pressure sensor is obtained; u shape g Is a connection point P d A resistance value with the thin film pressure sensor; r k Is a connection point P c The corresponding resistance value of the reference resistor.
Further optionally, the second obtaining module includes:
the second acquisition submodule is used for acquiring a preset function by using a data fitting method according to the resistance value of a pressure sensitive area in the historical film pressure sensor and the corresponding plantar pressure value of the pressure sensitive area in the historical film pressure sensor;
and the third obtaining submodule is used for inputting the resistance value of the pressure sensitive area in the current film pressure sensor into a preset function and obtaining the current sole pressure value corresponding to the pressure sensitive area in the current film pressure sensor.
Further optionally, the system further comprises: and the power supply unit is used for supplying power to the plantar pressure acquisition system.
It should be noted that, the skilled person can set the type of the power supply unit according to engineering needs or actual needs, for example, 1S lithium battery power (3.7V) can be selected, and the capacity is 300mAH.
Further optionally, the system further comprises: the communication unit is used for transmitting the current sole pressure value acquired by the controller to the receiving terminal;
and the controller is also used for sending the acquired current plantar pressure value to the communication unit.
In some embodiments, the communication unit may, but is not limited to, transmit the current plantar pressure value acquired by the controller to the receiving terminal through ZigBee communication technology.
The plantar pressure acquisition system provided by the embodiment can detect plantar pressure in real time, and effectively improves the accuracy of pressure detection; the cost is low, the power consumption is low, the applicability is wide, and the size is small and the wearing is convenient.
To further illustrate the above-mentioned plantar pressure collection system, the present application provides a specific plantar pressure collection system, see fig. 3, including: a thin film pressure sensor, 4 reference resistors and a CC2530 processor;
further, the film pressure sensor is a piezoresistive film pressure sensor.
It should be noted that the membrane pressure sensor is configured in the shape of an insole so as to be conveniently placed in a shoe.
Further, as shown in fig. 4 and 5, the thin film pressure sensor includes 16 pressure sensitive areas; the film pressure sensor sequentially comprises from top to bottom: a first conductive layer, a pressure sensitive material, and a second conductive layer.
It should be noted that each pressure sensitive area corresponds to a variable resistor, and when the pressure acting on each area changes, the corresponding resistance value also changes.
Further, as shown in fig. 3, 16 pressure sensitive regions in the thin film pressure sensor and 4 reference resistors form a resistor network, the resistor network includes 10 IO interfaces, which are P1.0-P1.7, P2.1 and P2.2, and the 10 IO interfaces are all connected to GPIOs of the CC2530 processor;
a connection point between each reference resistor and the film pressure sensor is taken as an ADC node, and each ADC node is respectively connected with an ADC channel of the CC2530 processor; wherein, the 4 ADC nodes are N1-N4; the ADC channels of the 4 CC2530 processors are P0.4-P0.7.
Specifically, the resistance value of each reference resistor is 300K Ω, and the 4 reference resistors are Ref1 to Ref4.
Further, 4 ADC channels of the CC2530 processor are used for respectively obtaining voltage values from the 4 ADC nodes.
Further, the CC2530 processor is used for analyzing the circuit network by utilizing a polling method and a kirchhoff current law to obtain the resistance value of each pressure sensitive area (variable resistor);
and acquiring the corresponding plantar pressure value of each pressure sensitive area (variable resistor) by using the resistance value of each pressure sensitive area (variable resistor) and a preset function.
It should be noted that the "polling method and kirchhoff's current law" referred to in the present embodiment is well known to those skilled in the art, and therefore, the specific implementation manner thereof is not described too much.
Further, analyzing the circuit network by using a polling method and kirchhoff's current law to obtain the resistance value of each pressure sensitive area (variable resistor), wherein the method comprises the following steps:
step 1: selecting P1.0 of IO interfaces P1.0-P1.3, P2.1 and P2.2 as an output port, and inputting a high level; selecting P1.4 of IO interfaces P1.4-P1.7 as an output port, outputting low level, and setting all other IO interfaces to be in a high impedance state; thus, the resistor network is equivalent to the resistor network shown in FIG. 6;
the incoming current of the resistor network in the dashed box in fig. 6 is equal to the outgoing current, i.e.:
i in1 +i in2 +i in3 +i in4 ＝i o1 +i o2 +i o3 +i o4 (1)
and due to i o2 ＝i o3 ＝i o4 =0, then equation (1) can be converted to the following equation:
in the above formula, U 1 ～U 4 Obtaining voltage values, U, from 4 ADC nodes for ADC channels in a CC2530 processor V Is the high level voltage at the IO interface P1.0;
and 2, step: selecting P1.0 of IO interfaces P1.0-P1.3, P2.1 and P2.2 as an output port, and inputting a high level; selecting P1.5 of the IO interfaces P1.4-P1.7 as an output port, outputting a low level, and setting all other IO interfaces to be in a high impedance state;
similarly, according to the principle in step 1, the following formula is obtained:
in the above formula, U' t (t =1,2,3,4) reacquires the voltage values from the 4 ADC nodes for the ADC channel in the CC2530 processor;
and 3, step 3: selecting P1.0 of IO interfaces P1.0-P1.3, P2.1 and P2.2 as an output port, and inputting a high level; selecting P1.6 of IO interfaces P1.4-P1.7 as an output port, and outputting a low level; all other IO interfaces are set to be in a high-impedance state;
similarly, according to the principle in step 1, the following formula is obtained:
in the above formula, U t (t =1,2,3,4) reacquires the voltage values from the 4 ADC nodes for the ADC channel in the CC2530 processor;
and 4, step 4: selecting P1.0 of IO interfaces P1.0-P1.3, P2.1 and P2.2 as an output port, and inputting a high level; selecting P1.7 of IO interfaces P1.4-P1.7 as an output port, and outputting a low level; all other IO interfaces are set to be in a high-impedance state;
similarly, according to the principle in step 1, the following formula is obtained:
in the above formula, U' t (t =1,2,3,4) reacquires the voltage values from the 4 ADC nodes for the ADC channel in the CC2530 processor;
and 5: the following equation can be obtained from equations (2) to (5):
in the above formula, C is a 4 × 4 matrix, D is a column vector, and the reciprocal values of the variable resistors R1 to R4 are obtained by solving the formula (5);
step 6: re-selecting one IO interface from the IO interfaces P1.0-P1.3, P2.1 and P2.2 as an output port, and inputting a high level; selecting one IO interface from the IO interfaces P1.4-P1.7 as an output port, and outputting a low level; and (5) obtaining the reciprocal values of all the variable resistors according to the principle in the steps (1) to (5) in the same way.
Further, obtaining a corresponding plantar pressure value of each pressure sensitive area (variable resistor) by using the resistance value of each pressure sensitive area (variable resistor) and a preset function, wherein the steps of:
according to the resistance value of the pressure sensitive area in the historical film pressure sensor and the corresponding plantar pressure value of the pressure sensitive area in the historical film pressure sensor, a preset function is obtained by using a data fitting method:
y＝0.0058x+0.0022
in the above formula, x is the reciprocal of the variable resistance and has a unit of K omega; y is the pressure value in N.
Further, the CC2530 processor further comprises: the ZigBee wireless communication unit is used for transmitting the plantar pressure value acquired by the CC2530 processor to the receiving end;
the receiving end may include, but is not limited to: a computer or a mobile phone;
for example, the interface of the receiving end as shown in fig. 7.
Further, the system further comprises: and the power supply unit is used for supplying power to the plantar pressure acquisition system.
The power supply unit may be, but is not limited to, a lithium battery (3.7V) having a capacity of 300mAH.
The plantar pressure acquisition system provided by the embodiment can detect plantar pressure in real time; the CC2530 processor is adopted, and the built-in 8-channel 14-bit AD channel and the wireless communication function are utilized, so that the accuracy of pressure detection is effectively improved; the low-cost film pressure sensor is adopted, the shape of the film pressure sensor is matched with the foot structure, the material is relatively soft, and the film pressure sensor is easy to place in different shoes; the plantar pressure acquisition system provided by the embodiment is low in cost, low in power consumption, wide in applicability and small in size (30 x 30mm), and is convenient to wear; meanwhile, the medical service can be contributed.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (9)
1. A plantar pressure acquisition system, comprising:
the film pressure sensor is used for acquiring a current sole pressure signal;
the signal processing unit is used for converting the current sole pressure signal into a current sole voltage signal;
the controller is used for acquiring a current sole pressure value according to the current sole voltage signal;
wherein the signal processing unit includes: the device comprises a plurality of reference resistors and a plurality of analog-to-digital conversion modules, wherein one end of each reference resistor is connected with one output end of a film pressure sensor, and the other end of each reference resistor is connected with a controller; the connection point between each reference resistor and the output end of the film pressure sensor is connected with the input end of one analog-to-digital conversion module;
the controller includes: a first acquisition module and a second acquisition module; the first acquisition module is used for acquiring the resistance value of a pressure sensitive area in the current film pressure sensor; the second acquisition module is used for acquiring a current plantar pressure value corresponding to a pressure sensitive area in the current film pressure sensor;
the first obtaining module includes:
a first determination submodule for making a connection point between the reference resistance and the controller be P a ；
The connection point between the output end of the film pressure sensor and the controller is P b ；
Wherein a ∈ [1, A ], A is the total number of connection points between the reference resistance and the controller; b ∈ [1, B ], B being the total number of connection points between the reference resistance and the controller;
a first selection submodule for selecting a connection point P between the output of the membrane pressure sensor and the controller d Inputting high level for output port;
selecting a connection point P between the reference resistor and the controller c Inputting low level for output port;
wherein d belongs to [1, B ] and d is not equal to b, c belongs to [1, A ] and c is not equal to a;
second selection submodelA block for selecting a connection point P between the other reference resistors and the controller a Is in a high resistance state;
selecting a connection point P between the output ends of the other film pressure sensors and the controller b Is in a high resistance state;
the first acquisition submodule is used for acquiring the resistance value of an effective pressure sensitive area connected with the analog-to-digital conversion module in the film pressure sensor, and the resistance value of the effective pressure sensitive area connected with the analog-to-digital conversion module in the film pressure sensor is made to be the resistance value of the pressure sensitive area in the current film pressure sensor;
the judging submodule is used for judging whether the resistance values of all the pressure sensitive areas in the current film pressure sensor are completely acquired, and if so, outputting the resistance values of all the pressure sensitive areas in the current film pressure sensor;
if not, reselecting a connection point P between the output end of the film pressure sensor and the controller d Inputting high level for output port; reselecting a connection point P between the reference resistor and the controller c Inputting low level for output port; until the resistance values of all pressure sensitive areas in the current film pressure sensor are all obtained.
2. The system according to claim 1, wherein said analog-to-digital conversion modules are configured to convert said current plantar pressure signal into a current plantar voltage signal.
3. The system of claim 2, wherein the number of reference resistors is the same as the number of analog-to-digital conversion modules;
all the reference resistors have the same resistance value.
4. The system of claim 2, wherein the output of the analog-to-digital conversion module is connected to a controller;
the output end of the film pressure sensor which is not connected with the reference resistor is connected with the controller.
5. The system according to claim 4, wherein the first obtaining module is configured to obtain the current resistance value of the pressure sensitive area in the thin film pressure sensor by using a polling method according to the current sole voltage signal;
and the second acquisition module is used for inputting the resistance value of the pressure sensitive area in the current film pressure sensor into a preset function and acquiring the current sole pressure value corresponding to the pressure sensitive area in the current film pressure sensor.
6. The system of claim 1, wherein the first obtaining submodule is specifically configured to determine a resistance value R of a jth effective pressure sensitive area of the thin film pressure sensor coupled to the analog-to-digital conversion module according to the following formula j ：
In the above formula, i is E [1, N]N is the total number of the analog-to-digital conversion modules; j belongs to [1,M ]]M is the total number of pressure sensitive areas in the film pressure sensor; u shape V Is a voltage value of the high level, U i The resistance value between the ith analog-to-digital conversion module and the film pressure sensor is obtained; u shape g Is the connection point P d A resistance value with the thin film pressure sensor; r k Is a connection point P c The corresponding resistance value of the reference resistor.
7. The system of claim 5, wherein the second obtaining module comprises:
the second acquisition submodule is used for acquiring a preset function by using a data fitting method according to the resistance value of a pressure sensitive area in the historical film pressure sensor and the corresponding plantar pressure value of the pressure sensitive area in the historical film pressure sensor;
and the third obtaining submodule is used for inputting the resistance value of the pressure sensitive area in the current film pressure sensor into a preset function and obtaining the current sole pressure value corresponding to the pressure sensitive area in the current film pressure sensor.
8. The system according to any one of claims 1-7, further comprising: and the power supply unit is used for supplying power to the plantar pressure acquisition system.
9. The system according to any one of claims 1-7, further comprising: and the communication unit is used for transmitting the current sole pressure value acquired by the controller to a receiving terminal.
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