WO2023065145A1 - Joint data transmission system based on multiple distributed thin-film pressure collection instruments - Google Patents

Abstract

Disclosed in the present invention is a joint data transmission system based on multiple distributed thin-film pressure collection instruments. The system comprises multiple pressure sensors, multiple data collection boards, a signal converter board and a data processing device, wherein the multiple pressure sensors are connected to the multiple data collection boards in one-to-one correspondence, and are used for sensing electrical signals generated on the basis of a pressure change; the multiple data collection boards convert collected electrical signals into pressure numerical matrices, and transmit same to the signal converter board, the pressure numerical matrices being numerical signals which reflect pressure points of corresponding pressure sensors; the signal converter board is used for controlling data transmission between each data collection board and the data processing device; and the data processing device is used for analyzing and processing received data, so as to obtain pressure change information. In the present invention, for the situation where multiple data collection boards are used, a joint data transmission strategy is used to control a data transmission mode, thereby significantly reducing the wiring complexity while ensuring the transmission efficiency.

Description

A joint data transmission system based on multiple distributed thin-film pressure acquisition instruments technical field

The present invention relates to the field of electronic information technology, more specifically, to a joint data transmission system based on multiple distributed thin-film pressure acquisition instruments.

Background technique

In recent years, the rapid development of flexible electronic technology and microelectronic technology has driven the continuous innovation of distributed thin-film pressure sensors, and the density and number of collection points of distributed thin-film pressure sensors have also continued to increase.

At present, for the pressure film that needs to collect a large number of pressure collection points, the determinant wiring method is usually used. In this manner, a large number of pressure collection points can be located with fewer external wires. The number of pressure collection points that can be positioned is the product of the number of rows and columns of the pressure film. However, due to the complex manufacturing process and high development cost of distributed thin-film pressure sensors, customized products are expensive. Therefore, each manufacturer will launch several flexible pressure sensors of standard specifications for mass production in order to reduce the price of the product. For situations that require a large area and a large number of pressure sensing units, it is usually considered to use multiple distributed thin-film pressure sensors to splicing, that is, by purchasing multiple distributed thin-film pressure sensors of standard specifications to splice them into the required shape and size. Distributed membrane pressure sensor. At present, the commonly used connection method is to connect the data acquisition module of each determinant film pressure sensor to the serial port interface of the computer through its own serial port interface. For example, the existing joint data transmission technology of multiple determinant pressure thin film sensors is to connect multiple pressure sensor acquisition instruments with multiple serial ports of the host computer one-to-one. This method is complicated to connect, and is not suitable for the situation where there are few computer serial ports, and because multiple serial port configurations need to be enabled, the corresponding upper computer software development is much more complicated than using a single serial port communication method.

In short, as far as the prior art is concerned, there are multiple pressure collection points distributed inside the distributed pressure membrane, and the resistance value of the pressure collection points will change accordingly under different applied pressures. Build a circuit to convert the change of resistance into a change of voltage, and then collect and convert the output voltage signal to obtain the corresponding value of each pressure point on the determinant pressure film. Due to the complex manufacturing process of the determinant pressure film, it is difficult to manufacture a large-area high-density determinant pressure film. Therefore, the current demand for large-area and high-density pressure detection is generally completed by splicing multiple determinant pressure films, and each pressure film corresponds to a data acquisition board. The traditional joint data transmission system of multiple distributed thin-film pressure acquisition instruments is to connect the interface of each data acquisition board with multiple interfaces of the computer host. The disadvantage of this method is that when there are too many pressure films to be spliced, the external wiring is too complicated and the computer configuration data interface is insufficient.

Contents of the invention

The purpose of the present invention is to overcome the defects of the above-mentioned prior art and provide a joint data transmission system based on multiple distributed thin-film pressure acquisition instruments. The system includes multiple pressure sensors, multiple data acquisition boards, signal adapter boards and Data processing equipment, in which:

The multiple pressure sensors are connected to the multiple data acquisition boards in one-to-one correspondence, and are used to sense electrical signals generated by pressure changes;

The plurality of data acquisition boards convert the collected electrical signals into a pressure numerical matrix and transmit them to the signal adapter board. The pressure numerical matrix is a numerical signal reflecting each pressure point of the corresponding pressure sensor;

The signal adapter board is used to control the data transmission between each data acquisition board and the data processing equipment;

The data processing device is used to analyze and process the received data to obtain pressure change information.

Compared with the prior art, the present invention has the advantage that when the data acquisition system includes multiple distributed flexible pressure sensors, the data processing equipment only needs to use one serial port interface to acquire data from different data acquisition boards, significantly reducing the Wiring complexity of the system.

Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention.

1 is a schematic diagram of a joint data transmission system based on multiple distributed thin-film pressure acquisition instruments according to an embodiment of the present invention;

2 is a schematic diagram of a communication protocol between a data acquisition board and a signal adapter board according to an embodiment of the present invention;

Figure 3 is a schematic diagram of a single distributed flexible membrane pressure sensor according to one embodiment of the present invention;

Fig. 4 is a schematic diagram of a system comprising six distributed pressure thin film collectors according to an embodiment of the present invention;

Figure 5 is a visualization of footprint pressure obtained according to one embodiment of the present invention.

Detailed ways

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and in no way taken as limiting the invention, its application or uses.

Techniques, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such techniques, methods and devices should be considered part of the description.

In all examples shown and discussed herein, any specific values should be construed as exemplary only, and not as limitations. Therefore, other instances of the exemplary embodiment may have different values.

It should be noted that like numerals and letters denote like items in the following figures, therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

The present invention aims to propose a new joint acquisition system of multiple determinant pressure film acquisition instruments. The system adopts the method of adding a multi-channel data adapter board to connect the interfaces of multiple data acquisition boards to a multi-channel data transfer board. In the receiving board. The multi-channel data adapter board will judge and judge the external transmission data path to ensure that only one data interface is connected to the data processing equipment such as the computer host during each data transmission process.

Referring to Figure 1, the provided joint data transmission system based on multiple distributed thin-film pressure acquisition instruments includes multiple pressure sensors, multiple data acquisition boards (or signal acquisition boards), signal adapter boards and data processing equipment . The data processing equipment can be of various types, such as computing and processing equipment such as a host computer. The pressure sensor may be a pressure film sensor. For the sake of clarity, the upper computer (or computer, computer host) and the determinant flexible pressure film sensor will be described as examples below.

The data acquisition board is used to obtain the electrical signal changes of the distributed flexible pressure sensor under different pressures, convert the electrical signals into data signals, and then send them to the signal adapter board through the serial port.

The signal adapter board is connected to each data acquisition board through the serial port interface, but only one serial port is used between the signal adapter board and the host computer. The on-off of the communication connection between each pressure sensor and the upper computer is completed by controlling the analog switch in the signal adapter board.

In order to prevent the problem of signal crosstalk caused by the transmission of different serial channel signals in the same channel, only one analog channel will be connected at the same time during the data transmission process of the signal acquisition board. The data acquisition board sends the collected signals to the computer in an orderly manner, each time sending a matrix of pressure values (including the numerical signals of all pressure points of a pressure acquisition instrument). After sending a matrix of pressure values, the channel of the signal adapter board is switched to the next data acquisition board, and so on.

In one embodiment, as shown in FIG. 2, there are two signal prompt pins in each data acquisition board, which are respectively connected to two pins of the signal adapter board. Prompt pins and prompt pins that are allowed to send signals, the high and low level prompts of the pins are used to determine the switching of the channel of the analog switch in the signal adapter board. Use the low level as the effective state of the prompt pin. When the prompt pin being sent is low, it means that the data acquisition board is sending data to the signal adapter board. At this time, open its corresponding serial port signal channel and connect the data acquisition board. The channel between the board and the serial port of the computer. When a data matrix transmission of the data acquisition board is completed, the sending signal pin is set to a high level, prompting the signal acquisition board to close the current serial port channel, open the next serial port channel, and connect the permission of the next data acquisition board The setting of the signal sending pin is a low level for a period of time, and the duration of the low level can be set according to the amount of data transmission, the baud rate of the serial port, etc. When the data acquisition board detects that the sending signal pin is in a low state, it starts to send the pressure matrix data. Such reciprocation, the use of the serial port can quickly and orderly realize the accurate transmission of signals. Since the switching of the analog switch and the reading of the state of the two signal pins only take a few microseconds during the switching process of the communication port, this data transmission strategy can realize the combination of multiple data acquisition boards and fast real-time communication.

It should be understood that the high level can also be used as the valid state of the prompt pin, for example, when the prompt pin being sent is at a high level, it means that the data acquisition board is sending data to the signal adapter board, in this setting Below, the data transmission strategy is similar and will not be repeated here.

It should be noted that, without departing from the spirit and scope of the present invention, those skilled in the art may make appropriate changes or modifications to the above-mentioned embodiments. For example, in addition to using a serial port for communication, a serial peripheral interface (SPI) or an integrated circuit bus (IIC) can also be used for communication.

To sum up, since the provided system only uses one serial port interface to connect with the computer, it can not only reduce the complexity of external wiring, but also reduce the software development work of the host computer for multiple distributed pressure film sensors. This is because the traditional multi-block pressure sensor acquisition instrument is connected to the host computer through serial ports. In the process of software development, it is necessary to open multiple serial port configurations, and then take the data transmitted by each serial port. In the system proposed by the present invention, the development of the upper computer software only needs to open the configuration of a serial port to receive the data transmitted by multiple pressure sensor collectors.

In order to further verify the effect of the present invention, experiments were carried out. Six distributed pressure film sensors were used in the experiment, as shown in Figure 3 and Figure 4, where a single distributed flexible film pressure sensor contains 1024 pressure test units. In the experiment, 6 pieces of distributed flexible film pressure sensors were spliced together and connected to the data acquisition instrument. The data acquisition instrument sends the data to the host computer through the serial port. The data communication rate of the system is mainly determined by the sending rate setting of the serial port. Experiments have proved that even when the baud rate of the serial port is configured to a very high rate (such as 460800 baud rate), data transmission is rarely garbled. Figure 5 is a visualization of the footprint pressure obtained using this system. Through experimental measurement, the system provided by the invention can accurately and efficiently obtain the information on the pressure change of footprints.

To sum up, the present invention provides a joint data transmission strategy for multiple distributed thin-film pressure sensors by designing a communication protocol between the data acquisition board and the signal adapter board. And, connect the serial port interface of the data acquisition module of each pressure sensor to the interface in the multi-channel data adapter board respectively, and then connect a serial port interface of the multi-channel data adapter board with the serial port interface of the computer. In this way, the complexity of connecting multiple pressure sensor data acquisition boards to the computer can be reduced, and since the host computer only occupies one serial port, compared with the strategy of using multiple serial ports to communicate with the data acquisition board respectively, the present invention significantly simplifies The development of host computer software. In addition, the signal acquisition instrument uses a multi-channel analog switch, which can realize fast channel switching and ensure the efficiency of data transmission.

The present invention can be a system, method and/or computer program product. A computer program product may include a computer readable storage medium having computer readable program instructions thereon for causing a processor to implement various aspects of the present invention.

A computer readable storage medium may be a tangible device that can retain and store instructions for use by an instruction execution device. A computer readable storage medium may be, for example, but is not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer diskettes, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), or flash memory), static random access memory (SRAM), compact disc read only memory (CD-ROM), digital versatile disc (DVD), memory stick, floppy disk, mechanically encoded device, such as a printer with instructions stored thereon A hole card or a raised structure in a groove, and any suitable combination of the above. As used herein, computer-readable storage media are not to be construed as transient signals per se, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., pulses of light through fiber optic cables), or transmitted electrical signals.

Computer-readable program instructions described herein may be downloaded from a computer-readable storage medium to a respective computing/processing device, or downloaded to an external computer or external storage device over a network, such as the Internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and/or edge servers. A network adapter card or a network interface in each computing/processing device receives computer-readable program instructions from the network and forwards the computer-readable program instructions for storage in a computer-readable storage medium in each computing/processing device .

Computer program instructions for carrying out operations of the present invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or Source or object code written in any combination, including object-oriented programming languages—such as Smalltalk, C++, Python, etc., and conventional procedural programming languages—such as the “C” language or similar programming languages. Computer readable program instructions may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer, or entirely on the remote computer or server implement. In cases involving a remote computer, the remote computer can be connected to the user computer through any kind of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computer (such as via the Internet using an Internet service provider). connect). In some embodiments, an electronic circuit, such as a programmable logic circuit, field programmable gate array (FPGA), or programmable logic array (PLA), can be customized by utilizing state information of computer-readable program instructions, which can Various aspects of the invention are implemented by executing computer readable program instructions.

Aspects of the present invention are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It should be understood that each block of the flowcharts and/or block diagrams, and combinations of blocks in the flowcharts and/or block diagrams, can be implemented by computer-readable program instructions.

These computer-readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine such that when executed by the processor of the computer or other programmable data processing apparatus , producing an apparatus for realizing the functions/actions specified in one or more blocks in the flowchart and/or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause computers, programmable data processing devices and/or other devices to work in a specific way, so that the computer-readable medium storing instructions includes An article of manufacture comprising instructions for implementing various aspects of the functions/acts specified in one or more blocks in flowcharts and/or block diagrams.

It is also possible to load computer-readable program instructions into a computer, other programmable data processing device, or other equipment, so that a series of operational steps are performed on the computer, other programmable data processing device, or other equipment to produce a computer-implemented process , so that instructions executed on computers, other programmable data processing devices, or other devices implement the functions/actions specified in one or more blocks in the flowcharts and/or block diagrams.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, a portion of a program segment, or an instruction that includes one or more Executable instructions. In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by a dedicated hardware-based system that performs the specified function or action , or may be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementation by means of hardware, implementation by means of software, and implementation by a combination of software and hardware are all equivalent.

Having described various embodiments of the present invention, the foregoing description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and alterations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principle of each embodiment, practical application or technical improvement in the market, or to enable other ordinary skilled in the art to understand each embodiment disclosed herein. The scope of the invention is defined by the appended claims.

Claims (10)

1. A joint data transmission system based on multiple distributed thin-film pressure acquisition instruments, including multiple pressure sensors, multiple data acquisition boards, signal adapter boards and data processing equipment, wherein:

   The multiple pressure sensors are connected to the multiple data acquisition boards in one-to-one correspondence, and are used to sense electrical signals generated by pressure changes;

   The plurality of data acquisition boards convert the collected electrical signals into a pressure numerical matrix and transmit them to the signal adapter board. The pressure numerical matrix is a numerical signal reflecting each pressure point of the corresponding pressure sensor;

   The signal adapter board is used to control the data transmission between each data acquisition board and the data processing equipment;

   The data processing device is used to analyze and process the received data to obtain pressure change information.
2. The system according to claim 1, wherein the signal adapter board is connected to each data acquisition board through a serial port interface, and the signal adapter board and the data processing device are connected through a serial port. data transmission.
3. The system according to claim 2, wherein, for each data acquisition board, a first signal prompt pin and a second signal prompt pin are respectively set to be connected to two pins of the signal adapter board, wherein the first A signal prompt pin is used to indicate whether the data acquisition board is sending data, and a second signal prompt pin is used to indicate whether the data acquisition board is allowed to send data to the data processing device.
4. The system according to claim 3, wherein the signal adapter board controls the data transmission between the signal acquisition board and the data processing device according to the following steps:

   When the first signal prompt pin is set to low level, it means that the data acquisition board is sending data to the signal adapter board. At this time, open the serial port signal channel corresponding to the data acquisition board and connect the data acquisition board with the data processing equipment Channel between serial ports;

   When the data acquisition board sends a pressure value matrix, set the first signal prompt pin to high level, instruct the data acquisition board to close the current serial port channel, open the next serial port channel, and connect to the next data acquisition board The second signal prompt pin is set to a low level for a period of time.
5. The system according to claim 1, wherein the pressure sensor is a determinant flexible sensor, and a plurality of pressure collection points are distributed, and each pressure collection point is positioned by a determinant mark.
6. The system according to claim 1, characterized in that, the communication between the signal adapter board and the data processing device is carried out through a serial port, a serial peripheral interface (SPI) or an integrated circuit bus (IIC).
7. The system according to claim 1, wherein the data processing device is a host computer.
8. The system according to claim 1, wherein the data acquisition board adopts a multi-channel analog switch to realize channel switching.
9. The system according to claim 1, wherein the multi-piece pressure sensor is arranged as six distributed flexible film pressure sensors spliced together, and each piece of pressure sensor contains 1024 pressure units.
10. The system according to claim 2, wherein the baud rate of the serial port is set to 460800.

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