Mobile multi-sensor data acquisition synchronization device

Abstract

The utility model relates to the technical field of data acquisition, in particular to a mobile multi-sensor data acquisition synchronizer, which is characterized in that an industrial personal computer is connected with a core board and a gigabit switch, the periphery of the core board is provided with a daughter board, the daughter board is connected with an interface board, the interface board provides a plurality of external interfaces, and each external interface is respectively connected with a sensor. According to the mobile multi-sensor data acquisition synchronization platform provided by the scheme, data acquisition and time synchronization of a large number of multi-type sensors can be realized, and parallel replacement of the same type of sensors with different performance indexes is supported, so that the manufacturing cost is greatly reduced; a plurality of sensor access interfaces are provided, so that the expansibility is ensured; and various sensor access interfaces are provided, so that different application scenes are met, and the universality of the platform is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of data acquisition, in particular to a mobile multi-sensor data acquisition synchronization device. Background Art

[0002] The vehicle-mounted mobile measurement system is a special detection instrument used in the fields of earth science, surveying and mapping science and technology, and water conservancy engineering. It can realize the synchronous collection of point cloud data and image data.

[0003] Currently, commercially available vehicle-mounted mobile measurement systems suffer from high R&D barriers, inconsistent performance indicators, high prices, a small number of sensors, a single sensor type, inability to connect to the same or other sensors, and high maintenance costs. These drawbacks make these systems cost-effective and practical. To improve the practicality of vehicle-mounted mobile measurement systems, they need to be equipped with a greater number and variety of sensors without increasing their equipment redundancy. Therefore, this solution provides a mobile multi-sensor data acquisition and synchronization device that can accommodate a wider range of sensor types and a greater number of sensors. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the present invention proposes a mobile multi-sensor data acquisition and synchronization device, which can enrich the types of sensors carried and increase the number of sensors carried, providing a more universal platform for data acquisition.

[0005] In a first aspect, the technical solution adopted by the present invention is a mobile multi-sensor data acquisition and synchronization device.

[0006] In a first possible implementation, a mobile multi-sensor data acquisition and synchronization device includes:

[0007] The industrial computer is connected to a core board and a gigabit switch. A daughter board is arranged around the core board, which is connected to an interface board. The interface board provides multiple external interfaces, each of which is connected to a sensor.

[0008] In combination with the first implementable manner, in a second implementable manner, the core board is connected to the inertial measurement unit.

[0009] In combination with the first possible implementation, in a third possible implementation, the external interfaces of the interface board are respectively connected to the GPS, the odometer, the laser scanner, the 3D structured light, and the camera.

[0010] Combined with the first possible implementation, in the fourth possible implementation, the daughter board is equipped with a serial port expansion circuit, the serial port expansion circuit includes a serial port chip, the serial port chip is a CH438Q chip, pins 2, 16, and 42 of the serial port chip are connected to the filter unit, pins 3, 14, and 17 of the serial port chip are all grounded, pins 18 and 19 of the serial port chip are connected to the external crystal oscillator unit, pin 33 of the serial port chip is connected to the power-on reset unit, pin 32 of the serial port chip is connected to the power indicator unit, pins 22 and 2 Pins 3, 30, and 31 are connected to the first interface chip, pins 13, 15, 20, and 21 of the serial port chip are connected to the second interface chip, pins 11, 12, 24, and 25 of the serial port chip are connected to the third interface chip, pins 26, 27, 28, and 29 of the serial port chip are connected to the fourth interface chip, pins 5, 6, 7, 8, 9, and 10 of the serial port chip are not connected, and pins 1, 4, 32, 33, 34-41, 43, and 44 of the serial port chip are connected to the STM32F407 chip of the core board.

[0011] In combination with the fourth possible implementation method, in the fifth possible implementation method, the external crystal oscillator unit includes: a crystal oscillator, one end of which is respectively connected to pin 18 of the serial port chip and one end of the second capacitor, the other end of the crystal oscillator is respectively connected to pin 19 of the serial port chip and one end of the third capacitor, and the other ends of the second capacitor and the third capacitor are grounded.

[0012] In combination with the fourth possible implementation method, in the sixth possible implementation method, the power-on reset unit includes: a first resistor, one end of which is connected to pin 2 of the serial port chip, the other end of the first resistor is respectively connected to pin 33 of the serial port chip and one end of a fourth capacitor, and the other end of the fourth capacitor is grounded.

[0013] In combination with the fourth possible implementation method, in the seventh possible implementation method, the power indicator light unit includes: a second resistor, one end of which is connected to pin 32 of the serial port chip, the other end of the second resistor is respectively connected to pin 2 of the serial port chip and one end of a third resistor, the other end of the third resistor is connected to one end of the first light-emitting diode, and the other end of the first light-emitting diode is grounded.

[0014] In combination with the fourth possible implementation, in an eighth possible implementation, the filtering unit includes: a first capacitor C1S, one end of which is respectively connected to pins 2, 16, and 42 of the serial port chip, and the other end of the first capacitor C1S is grounded.

[0015] In combination with the first feasible method, in the ninth feasible method, the daughter board is equipped with a serial port to USB circuit, and the serial port to USB circuit includes an FT232RL interface conversion chip, pins 1 and 5 of the FT232RL interface conversion chip are connected to the STM32F407 chip of the core board, pins 22 and 23 of the FT232RL interface conversion chip are connected to the first conversion branch, pins 21, 18, 7, 25 and 26 of the FT232RL interface conversion chip are grounded, pins 15 and 16 of the FT232RL interface conversion chip are external USB interfaces, pin 17 of the FT232RL interface conversion chip is grounded through a capacitor, and pins 20 and 4 of the FT232RL interface conversion chip are both connected to the second conversion branch.

[0016] In the second aspect, the technical solution adopted by the present invention is a mobile multi-sensor data acquisition and synchronization platform.

[0017] In a tenth possible implementation manner, a mobile multi-sensor data acquisition and synchronization platform includes the mobile multi-sensor data acquisition and synchronization device as described above.

[0018] From the above technical solution, it can be seen that the beneficial technical effects of the utility model are as follows:

[0019] 1. This solution can achieve data collection and time synchronization for a large number of multi-type sensors, support the parallel replacement of sensors of the same type with different performance indicators, thereby greatly reducing manufacturing costs; provide multiple sensor access interfaces to ensure scalability; provide a variety of sensor access interfaces to meet different application scenarios and improve the universality of the platform.

[0020] 2. This solution provides a more universal platform for data collection, which can reduce blind spots in data collection and make the data more complete. In addition, this solution can be equipped with different sensors to meet different engineering application requirements, thereby meeting project needs and improving the universality of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. Similar elements or parts are generally identified by similar reference numerals throughout the drawings. Elements or parts in the drawings are not necessarily drawn to scale.

[0022] Figure 1 A schematic diagram of a mobile multi-sensor data acquisition and synchronization device provided in this embodiment;

[0023] Figure 2 A schematic diagram of the structure of a serial port expansion circuit provided in this embodiment;

[0024] Figure 3 A schematic diagram of the connection of a serial port chip provided in this embodiment;

[0025] Figure 4 A circuit diagram of a filter unit provided in this embodiment;

[0026] Figure 5 A circuit diagram of an external crystal oscillator unit provided in this embodiment;

[0027] Figure 6 A circuit diagram of a power-on reset unit provided in this embodiment;

[0028] Figure 7 A circuit diagram of a power indicator light unit provided in this embodiment;

[0029] Figure 8 A connection diagram of an interface conversion chip provided in this embodiment;

[0030] Figure 9 A circuit diagram of the first conversion branch provided in this embodiment;

[0031] Figure 10 A circuit diagram of the second conversion branch provided in this embodiment;

[0032] Figure 11 A connection diagram of the first MAX3232 chip provided in this embodiment;

[0033] Figure 12 This is a connection diagram of the second MAX3232 chip provided in this embodiment;

[0034] Reference numerals:

[0035] 1-industrial computer, 2-core board, 3-gigabit switch, 4-daughter board, 5-interface board, 6-sensor, 7-inertial measurement unit, 8-GPS, 9-odometer, 10-laser scanner, 11-3D structured light, 12-camera, 13-serial port chip, 14-external crystal oscillator unit, 15-power-on reset unit, 16-filter unit, 17-power indicator light unit, 18-interface chip, C1S-first capacitor, C15-second capacitor, C16-third capacitor, C17-fourth capacitor, C1-fifth capacitor, C2-sixth Capacitor, C3-seventh capacitor, C5-eighth capacitor, C6-ninth capacitor, C7-tenth capacitor, C8-eleventh capacitor, C9-twelfth capacitor, C10-thirteenth capacitor, C11-fourteenth capacitor, C12-fifteenth capacitor, C13-sixteenth capacitor, C14-seventeenth capacitor, R12-first resistor, R13-second resistor, R14-third resistor, R2-fourth resistor, R3-fifth resistor, D10-first light-emitting diode, D2-second light-emitting diode, D3-third light-emitting diode, X1-crystal oscillator. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present invention are described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention and are therefore only examples and are not intended to limit the scope of protection of the present invention.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which this utility model belongs.

[0038] Combine Figure 1 As shown, this embodiment provides a mobile multi-sensor data acquisition and synchronization device, including: a core board 2 and a gigabit switch 3 are connected to an industrial computer 1, a sub-board 4 is arranged on the periphery of the core board 2, the sub-board 4 is connected to an interface board 5, and the interface board 5 provides multiple external interfaces, each of the external interfaces is connected to a sensor 6 respectively.

[0039] The working principle of Example 1 is described in detail below:

[0040] The industrial computer runs the acquisition program and stores sensor data. The core board is the core processing unit, primarily responsible for data reception and forwarding, and achieving time synchronization among various sensors. The core board's peripheral circuitry is located on the daughterboard, which provides the communication interface. The wiring board for the daughterboard's communication interface is the interface board, providing an external interface and bridging the gap between the platform and the various sensors. The gigabit switch facilitates communication and data transmission between the industrial computer and the various sensors. Data acquisition from multiple types and numbers of sensors is achieved through the core board, daughterboard, interface board, industrial computer, and gigabit switch.

[0041] In some embodiments, the mobile multi-sensor data acquisition and synchronization device provided by this solution has the following advantages: 1. It provides a universal mobile sensor data acquisition and synchronization platform, lowering the research and development threshold for vehicle-mounted mobile measurement systems. 2. Users can freely choose three-dimensional laser scanners (LiDAR) of different accuracies, reducing the manufacturing cost of the vehicle-mounted mobile measurement system and improving the scalability and universality of the vehicle-mounted mobile measurement system. 3. It provides a rich sensor access interface, supporting the rapid access of multiple sensors of the same type and multiple sensors of different types, while achieving data acquisition and synchronization while improving the scalability and universality of the system.

[0042] 4. It can quickly realize the system integration of the vehicle-mounted mobile measurement system and support the rapid access of multiple and various sensors. Currently, there are no similar products on the market, and this invention can fill the gap in the industry.

[0043] Combine Figure 1 As shown, the core board is connected to the inertial measurement unit 7, which includes PPS pulse per second and time synchronization protocols.

[0044] In some embodiments, a mobile multi-sensor data acquisition and synchronization device is provided with a three-layer PCB (Printed Circuit Board) with reserved synchronization and communication interfaces for each sensor. The mobile multi-sensor data acquisition and synchronization device is then connected to each sensor, while ensuring that each interface is correctly connected and the network is unobstructed. The mobile multi-sensor data acquisition and synchronization device receives the PPS pulse per second and time synchronization protocol from the inertial measurement unit and performs precise system time synchronization on the core board. After the core board time is precisely synchronized, the PPS pulse per second and synchronization protocol are output to the outside for time synchronization of sensors connected to the platform, thereby achieving time synchronization of sensor acquisition.

[0045] Combine Figure 1 As shown, the external interfaces of the interface board are respectively connected to a GPS (Global Positioning System) 8 , an odometer 9 , a laser scanner 10 , a 3D structured light 11 and a camera 12 .

[0046] In some embodiments, a mobile multi-sensor data acquisition and synchronization device includes a core board, a daughter board, an interface board, an industrial computer, and a gigabit switch, and is used for integration into a vehicle-mounted mobile measurement system. The vehicle-mounted mobile measurement system includes GPS, an inertial measurement unit (IMU), an odometer (DMI), a three-dimensional laser scanner (LiDAR), a camera, and 3D-structured light, etc., to achieve synchronous acquisition of point cloud and image data.

[0047] In some embodiments, the mobile multi-sensor data acquisition synchronization device is connected to the odometer, collects the odometer pulse signal, counts and saves the data to the industrial computer through the serial port, and completes the collection of the odometer data.

[0048] In some embodiments, a mobile multi-sensor data acquisition and synchronization device is connected to a laser scanner, and the device sends PPS pulses per second and a time synchronization protocol to the sensor for time synchronization. The collected data of the laser scanner is stored in an industrial computer via a network.

[0049] In some embodiments, a mobile multi-sensor data acquisition and synchronization device is connected to the 3D structured light, and the PPS pulse per second and synchronization protocol are sent to the device for time synchronization. The collected data of the 3D structured light is stored in the industrial computer through the network.

[0050] In some embodiments, a mobile multi-sensor data acquisition synchronization device is connected to a camera. By setting a certain time frequency and driving distance, the camera exposure is triggered and the timestamp of the camera exposure moment is captured. The image data is transmitted back to the industrial computer via USB3.0 to complete the image data acquisition.

[0051] Optionally, the core board includes an STM32F407 chip.

[0052] Combine Figure 2 As shown, the daughter board is equipped with a serial port expansion circuit, which includes a serial port chip 13. The serial port chip 13 is connected to an external crystal oscillator unit 14, a power-on reset unit 15, a filter unit 16, a power indicator light unit 17 and multiple interface chips 18 respectively.

[0053] Combine Figure 3 As shown, the serial port chip is a CH438Q chip, pins 2, 16, and 42 of the serial port chip are connected to the filtering unit, pins 3, 14, and 17 of the serial port chip are grounded, pins 18 and 19 of the serial port chip are connected to the external crystal oscillator unit, pin 33 of the serial port chip is connected to the power-on reset unit, pin 32 of the serial port chip is connected to the power indicator light unit, pins 22, 23, 30, and 31 of the serial port chip are connected to the first interface chip, pins 13, 15, 20, and 21 of the serial port chip are connected to the second interface chip, pins 11, 12, 24, and 25 of the serial port chip are connected to the third interface chip, pins 26, 27, 28, and 29 of the serial port chip are connected to the fourth interface chip, pins 5, 6, 7, 8, 9, and 10 of the serial port chip are not connected, and pins 1, 4, 32, 33, 34-41, 43, and 44 of the serial port chip are connected to the STM32F407 chip of the core board.

[0054] Optionally, the 1st, 4th, 32nd, 33rd, 34th-41st, 43rd, 44th pins of the serial chip are connected to the 87th, 57th, 56th, 91st, 132nd, 129th-124th, 93rd, 89th, 88th pins of the STM32F407 chip of the core board respectively.

[0055] In combination Figure 4 As shown, the filter unit comprises a first capacitor C1S, one end of which is connected to the 2nd, 16th, 42nd pins of the serial chip respectively, and the other end of the first capacitor C1S is grounded.

[0056] In combination Figure 5 As shown, the external crystal unit comprises a crystal X1, one end of which is connected to the 18th pin of the serial chip and one end of a second capacitor C15 respectively, and the other end of the crystal X1 is connected to the 19th pin of the serial chip and one end of a third capacitor C16 respectively, and the other ends of the second capacitor C15 and the third capacitor C16 are grounded.

[0057] In combination Figure 6 As shown, the power-on reset unit comprises a first resistor R12, one end of which is connected to the 2nd pin of the serial chip, and the other end of the first resistor R12 is connected to the 33rd pin of the serial chip and one end of a fourth capacitor C17 respectively, and the other end of the fourth capacitor C17 is grounded.

[0058] In combination Figure 7 As shown, the power indicator light unit comprises a second resistor R13, one end of which is connected to the 32nd pin of the serial chip, and the other end of the second resistor R13 is connected to the 2nd pin of the serial chip and one end of a third resistor R14 respectively, and the other end of the third resistor R14 is connected to one end of a first light-emitting diode D10, and the other end of the first light-emitting diode D10 is grounded.

[0059] Optionally, the interface chip is a MAX3232 chip.

[0060] Optionally, the 22nd, 23rd, 30th, 31st pins of the serial chip are connected to the 12th, 11th, 10th, 9th pins of the first interface chip respectively, the 13th, 15th, 20th, 21st pins of the serial chip are connected to the 12th, 11th, 10th, 9th pins of the second interface chip respectively, the 11th, 12th, 24th, 25th pins of the serial chip are connected to the 12th, 11th, 10th, 9th pins of the third interface chip respectively, and the 26th, 27th, 28th, 29th pins of the serial chip are connected to the 12th, 11th, 10th, 9th pins of the fourth interface chip respectively.

[0061] Optionally, the industrial computer is further connected to a display.

[0062] In combination Figure 8As shown, the daughter board is equipped with a serial port to USB circuit, which includes an FT232RL interface conversion chip. Pins 1 and 5 of the FT232RL interface conversion chip are connected to the STM32F407 chip of the core board, pins 22 and 23 of the FT232RL interface conversion chip are connected to the first conversion branch, pins 21, 18, 7, 25 and 26 of the FT232RL interface conversion chip are grounded, pins 15 and 16 of the FT232RL interface conversion chip are external USB interfaces, pin 17 of the FT232RL interface conversion chip is grounded through the fifth capacitor C1, pins 20 and 4 of the FT232RL interface conversion chip are both connected to the second conversion branch, and other pins of the FT232RL interface conversion chip are not connected.

[0063] In some embodiments, pins 1 and 5 of the FT232RL interface conversion chip are respectively connected to pins 102 and 101 of the STM32F407 chip of the core board.

[0064] Combine Figure 9 As shown, the first conversion branch includes: a second light-emitting diode D2, one end of which is connected to pin 22 of the FT232RL interface conversion chip, the other end of the second light-emitting diode D2 is connected to one end of the fourth resistor R2, a third light-emitting diode D3, one end of which is connected to pin 23 of the FT232RL interface conversion chip, the other end of the third light-emitting diode D3 is connected to one end of the fifth resistor R3, and the other ends of the fourth resistor R2 and the fifth resistor R3 are connected to the second conversion branch.

[0065] Combine Figure 10 As shown, the second conversion branch includes: one end of the sixth capacitor C2 is respectively connected to one end of the seventh capacitor C3, the other ends of the fourth resistor R2 and the fifth resistor R3, pin 20 of the FT232RL interface conversion chip, and pin 4 of the FT232RL interface conversion chip; the other ends of the sixth capacitor C2 and the seventh capacitor C3 are grounded.

[0066] Optionally, the daughter board carries a first serial port circuit and a second serial port circuit.

[0067] Combine Figure 11As shown, the first serial port circuit includes a first MAX3232 chip, a No. 1 pin of the first MAX3232 chip is connected to a No. 3 pin through an eighth capacitor C5, a No. 2 pin of the first MAX3232 chip is grounded through a ninth capacitor C6, a No. 4 pin of the first MAX3232 chip is connected to a No. 5 pin through a tenth capacitor C7, a No. 6 pin of the first MAX3232 chip is grounded through an eleventh capacitor C8, Nos. 9, 10, 11 and 12 pins of the first MAX3232 chip are connected to an STM32F407 chip of the core board, Nos. 7, 8, 13 and 14 pins of the first MAX3232 chip are connected to one end of the first indicator lamp circuit, a No. 15 pin of the first MAX3232 chip and one end of a twelfth capacitor C9 are grounded, and a No. 16 pin of the first MAX3232 chip is respectively connected to the other end of the twelfth capacitor C9 and the other end of the first indicator lamp circuit.

[0068] In some embodiments, Nos. 9, 10, 11 and 12 pins of the first MAX3232 chip are connected to Nos. 97, 96, 69 and 70 pins of the STM32F407 chip of the core board.

[0069] Optionally, the first indicator lamp circuit includes four branches in parallel, each branch includes one resistor and one light emitting diode in series, one end of each branch close to the resistor is commonly connected to the No. 16 pin of the first MAX3232 chip and the other end of the twelfth capacitor C9, and the other end of each branch close to the light emitting diode is respectively connected to Nos. 7, 8, 13 and 14 pins of the first MAX3232 chip.

[0070] In combination Figure 12 As shown, the second serial port circuit includes a second MAX3232 chip, a No. 1 pin of the second MAX3232 chip is connected to a No. 3 pin through a thirteenth capacitor C10, a No. 2 pin of the second MAX3232 chip is grounded through a fourteenth capacitor C11, a No. 4 pin of the second MAX3232 chip is connected to a No. 5 pin through a fifteenth capacitor C12, a No. 6 pin of the second MAX3232 chip is grounded through a sixteenth capacitor C13, Nos. 11 and 12 pins of the second MAX3232 chip are connected to the STM32F407 chip of the core board, Nos. 13 and 14 pins of the second MAX3232 chip are connected to one end of the second indicator lamp circuit, a No. 15 pin of the second MAX3232 chip and one end of a seventeenth capacitor C14 are grounded, and a No. 16 pin of the second MAX3232 chip is respectively connected to the other end of the seventeenth capacitor C14 and the other end of the second indicator lamp circuit, and other pins of the second MAX3232 chip are not connected.

[0071] In some embodiments, Nos. 11 and 12 pins of the second MAX3232 chip are connected to Nos. 34 and 35 pins of the STM32F407 chip of the core board.

[0072] Optionally, the second indicator light circuit comprises two branches in parallel, each branch comprising one resistor and one light emitting diode in series, the end of each branch close to the resistor being connected to the No.

[0073] In some embodiments, a mobile multi-sensor data acquisition synchronization platform comprises a mobile multi-sensor data acquisition synchronization device as described above. The mobile multi-sensor data acquisition synchronization device comprises: a core board and a gigabit switch connected to an industrial computer, the core board being provided with a sub-board peripherally, the sub-board being connected to an interface board, the interface board providing a plurality of external interfaces, each of the external interfaces being connected to a sensor 6.

[0074] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application.

Claims

1. A mobile multi-sensor data acquisition and synchronization device, characterized in that: include: The industrial computer is connected to a core board and a gigabit switch. A daughter board is arranged on the periphery of the core board. The daughter board is connected to an interface board. The interface board provides multiple external interfaces, and each of the external interfaces is connected to a sensor. The daughter board is equipped with a serial port expansion circuit, which includes a serial port chip. The serial port chip is a CH438Q chip. Pins 2, 16, and 42 of the serial port chip are connected to the filter unit, pins 3, 14, and 17 of the serial port chip are grounded, pins 18 and 19 of the serial port chip are connected to the external crystal oscillator unit, pin 33 of the serial port chip is connected to the power-on reset unit, pin 32 of the serial port chip is connected to the power indicator light unit, and pins 22, 23, 30, and 31 of the serial port chip are connected to the power-on reset unit. Connect the first interface chip, pins 13, 15, 20, and 21 of the serial port chip are connected to the second interface chip, pins 11, 12, 24, and 25 of the serial port chip are connected to the third interface chip, pins 26, 27, 28, and 29 of the serial port chip are connected to the fourth interface chip, pins 5, 6, 7, 8, 9, and 10 of the serial port chip are not connected, and pins 1, 4, 32, 33, 34-41, 43, and 44 of the serial port chip are connected to the STM32F407 chip of the core board.

2. The device according to claim 1, characterized in that The core board is connected to the inertial measurement unit.

3. The device according to claim 1, characterized in that The external interfaces of the interface board are connected to GPS, odometer, laser scanner, 3D structured light and camera respectively.

4. The device according to claim 1, characterized in that The external crystal oscillator unit includes: a crystal oscillator, one end of which is connected to pin 18 of the serial port chip and one end of the second capacitor, the other end of which is connected to pin 19 of the serial port chip and one end of the third capacitor, and the other ends of the second capacitor and the third capacitor are grounded.

5. The device according to claim 1, characterized in that The power-on reset unit includes: a first resistor, one end of which is connected to pin 2 of the serial port chip, the other end of which is respectively connected to pin 33 of the serial port chip and one end of a fourth capacitor, the other end of which is grounded.

6. The device according to claim 1, characterized in that The power indicator light unit includes: a second resistor, one end of which is connected to pin 32 of the serial port chip, the other end of the second resistor is respectively connected to pin 2 of the serial port chip and one end of a third resistor, the other end of the third resistor is connected to one end of the first light-emitting diode, and the other end of the first light-emitting diode is grounded.

7. The device according to claim 1, characterized in that The filtering unit includes: a first capacitor, one end of which is respectively connected to pins 2, 16, and 42 of the serial port chip, and the other end of the first capacitor is grounded.

8. The device according to claim 1, characterized in that The daughter board is equipped with a serial port to USB circuit, which includes an FT232RL interface conversion chip. Pins 1 and 5 of the FT232RL interface conversion chip are connected to the STM32F407 chip of the core board, pins 22 and 23 of the FT232RL interface conversion chip are connected to the first conversion branch, pins 21, 18, 7, 25 and 26 of the FT232RL interface conversion chip are grounded, pins 15 and 16 of the FT232RL interface conversion chip are external USB interfaces, pin 17 of the FT232RL interface conversion chip is grounded through a capacitor, and pins 20 and 4 of the FT232RL interface conversion chip are both connected to the second conversion branch.

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