Experiment development board with magnetic suction interface

Abstract

The utility model provides an experiment development board with a magnetic suction interface, and the board comprises a circuit board body which is provided with a preset experiment circuit. The magnetic connector is arranged on the circuit board body and comprises a packaging shell, a magnetic part and a conductive contact part; the conductive contact part is electrically connected with the experimental circuit; the magnetic attraction part is used for being in magnetic attraction butt joint with an external magnetic attraction plug. The problems that in the prior art, a signal transmission physical interface of an experiment development board is tedious in plugging connection process, low in reliability and poor in practicability are solved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit teaching equipment, and in particular to an experimental development board with a magnetic suction interface. Background Art

[0002] With the rise of STEM (science, technology, engineering and mathematics) education, experimental development boards have been widely used in the field of education. These development boards usually have rich interfaces and functional modules, such as various sensors, actuators, communication modules, etc., which can help students and researchers to carry out practical operations, project development and innovative experiments. In the existing experimental development boards, functional modules are connected to each other through communication interfaces, so that circuits with different functions can be realized. The communication interfaces usually include GPIO, I2C, SPI, UART, ADC and other interfaces. The physical connection interface methods are diversified. The existing common physical interfaces include 2.54mm pitch pin headers, 2.54mm pitch sockets, 2.0mm pitch male and female terminals, and RJ45 sockets.

[0003] When making electrical connections to traditional signal transmission physical interfaces (such as 2.54mm pitch pin headers and 2.54mm pitch sockets), DuPont wires are usually used for connection in teaching experiments. However, the plug connectors of the DuPont wires are prone to loosening during connection, affecting the stability of signal transmission. Furthermore, when the DuPont wires are connected to interfaces with multiple pins, the plug connectors of the DuPont wires need to be plugged into the pins one by one to achieve electrical connection, which results in cumbersome connection steps.

[0004] Therefore, the existing signal transmission physical interface for experimental development boards has the disadvantages of complicated plug-in connection process, low reliability and poor practicality. The existing technology still needs to be improved and developed. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide an experimental development board with a magnetic suction interface, which solves the problems in the prior art that the signal transmission physical interface of the experimental development board has the shortcomings of cumbersome plug-in connection process, low reliability and poor practicality.

[0006] The present application provides an experimental development board with a magnetic suction interface, comprising a circuit board body, wherein the circuit board body has a preset experimental circuit;

[0007] A magnetic attraction connector, which is arranged on a circuit board body and comprises a packaging shell, a magnetic attraction portion and a conductive contact portion;

[0008] The conductive contact portion is electrically connected to the experimental circuit;

[0009] The magnetic attraction portion is used for magnetically docking with an external magnetic attraction plug.

[0010] Optionally, at least two magnetic attraction parts are provided, and the at least two magnetic attraction parts are located on both sides of the conductive contact part and have opposite magnetic poles.

[0011] Optionally, a plurality of conductive contact portions are provided, and the plurality of conductive contact portions are arranged at intervals along a straight line;

[0012] The conductive contact portion includes: a metal spring ejector pin contact, the metal spring ejector pin contact is exposed on the front surface of the packaging shell;

[0013] The connecting pin is L-shaped, one end of which is fixed to the rear surface of the packaging shell and connected to the metal spring ejector contact, and the other end is welded on the circuit board body and electrically connected to the experimental circuit.

[0014] Optionally, a metal plating layer is provided on the surface of the conductive contact portion exposed from the packaging shell.

[0015] Optionally, at least four conductive contact portions are provided;

[0016] The four conductive contacts include: a 5V contact, a GPIO contact, a NC contact, and a GND contact;

[0017] Alternatively, the four conductive contacts include, in sequence: a 5V contact, an SCL contact, an SDA contact, and a GND contact;

[0018] Alternatively, the four conductive contacts include, in sequence: a 5V contact, an ADC contact, an NC contact, and a GND contact;

[0019] Alternatively, the four conductive contacts include in sequence: a 5V contact, a TX contact, a RX contact, and a GND contact.

[0020] Optionally, a plurality of magnetic connectors are provided, and the plurality of magnetic connectors are respectively provided at the periphery of the circuit board body.

[0021] Optionally, the magnetic attraction portion includes: a hemispherical boss, the hemispherical boss having a magnetic attraction end surface facing away from a side of the circuit board body;

[0022] An extension column connected to a side of the hemispherical boss facing away from the magnetic end face;

[0023] The diameter of the hemispherical boss is greater than the diameter of the extended cylinder.

[0024] Optionally, the packaging shell is adhesively fixed on the surface of the circuit board body.

[0025] Optionally, a positioning hole is opened on the surface of the circuit board body, and a positioning boss is arranged on the bottom surface of the packaging shell, and the positioning boss is embedded in the positioning hole to limit the packaging shell and the magnetic attraction connector.

[0026] Optionally, a power supply interface is provided on the circuit board body, and the power supply interface is electrically connected to a step-down chip in the experimental circuit;

[0027] The circuit board body is provided with double-row multi-pin sockets arranged at intervals for plugging in the main control module.

[0028] Optionally, the circuit board body includes: an upper board layer, the upper board layer is used to carry a power supply interface, a magnetic connector, a step-down chip, a double-row multi-pin socket and an LED power light;

[0029] The lower board layer is located on one side of the upper board layer and is used to set the routing of the experimental circuit.

[0030] Beneficial effects: The experimental development board with a magnetic interface in the present application is provided with a magnetic connector at the edge of the circuit board body, and the position of the conductive contact part is fixed by a packaging shell, so as to facilitate accurate docking with an external magnetic connector. In addition, a magnetic part is provided inside the packaging shell, and the external magnetic connector is attracted by the magnetic part, and the magnetic connector and the magnetic connector are attracted and fixed or pulled apart by suction. The external magnetic connector can be attracted and fixed by bringing it close to the magnetic connector. The operation is simple, and multiple contacts can be docked and electrically connected by fixing it once, which makes it more convenient to use. In addition, the magnetic attraction is stable and not easy to loosen, and poor contact caused by shaking is not easy to occur during use. By providing a magnetic connector, the circuit connection process is simpler, the operation is more standardized, it is not easy to make wrong connections, and it is more practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of an experimental development board with a magnetic interface according to an embodiment of the present application;

[0032] Figure 2 A schematic diagram of the structure of a magnetic attraction connector of an experimental development board with a magnetic attraction interface according to an embodiment of the present application;

[0033] Figure 3 This is a schematic diagram of different interface forms of a magnetic connector of an experimental development board with a magnetic interface according to an embodiment of the present application, wherein (a) is a GPIO magnetic interface form, (b) is an I2C magnetic interface form, (c) is an ADC magnetic interface form, and (d) is a UART magnetic interface form.

[0034] Figure 4 A circuit principle block diagram of an experimental circuit of an experimental development board with a magnetic suction interface according to an embodiment of the present application;

[0035] Figure 5 A cross-sectional view of another structure of a magnetic attraction connector of an experimental development board with a magnetic attraction interface according to an embodiment of the present application;

[0036] Figure 6 This is an exploded view of another structure of a magnetic connector of an experimental development board with a magnetic interface according to an embodiment of the present application when connected to a circuit board body.

[0037] In the figure: 100, circuit board body; 110, experimental circuit; 120, upper board layer; 130, lower board layer; 140, positioning hole; 200, magnetic connector; 210, packaging shell; 211, positioning boss; 220, magnetic part; 221, hemispherical boss; 222, magnetic end face; 223, extension column; 224, groove; 225, superior arc; 230, conductive contact part; 231, metal spring ejector contact; 232, connecting pin; 300, double-row multi-pin socket; 310, main control module; 320, power supply interface; 321, step-down chip; 322, USB to serial port module. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0039] The English abbreviations and key term definitions used in this application are explained as follows:

[0040] UART: A common serial communication interface standard (Universal Asynchronous Receiver-Transmitter).

[0041] I2C: A common serial communication protocol (Inter-Integrated Circuit, integrated circuit bus)

[0042] ADC: A control technology that converts analog signals into digital signals (Analog-to-Digital Converter)

[0043] SPI: A synchronous serial communication protocol (Serial Peripheral Interface)

[0044] PWM: A digital signal control technology (Pulse Width Modulation)

[0045] DAC: A control technology that converts digital signals into analog signals (Digital-to-Analog Converter)

[0046] CAN: A serial communication protocol (Controller Area Network).

[0047] Some typical interfaces in the existing signal communication physical interface are as follows: In the existing signal communication physical interface, not only does the pin-type interface have the above-mentioned shortcomings of cumbersome plug-in connection process, low reliability and poor practicality. And other interfaces also have similar problems. For example, although the 2.0mm pitch male and female terminal interface is relatively small and the connection stability is slightly better, the frequent plugging and unplugging during connection can easily lead to wear and aging of the interface, reducing the service life of the interface. The RJ45 socket is mainly used for the connection of network communication modules. Due to its complex design, cumbersome connection and low versatility. Therefore, in view of the above problems in the existing signal communication physical interface, the present application proposes the following embodiments to optimize the signal communication physical interface.

[0048] like Figure 1 , Figure 2 As shown, this embodiment proposes that the present application provides an experimental development board with a magnetic interface, including a circuit board body 100 and a magnetic connector 200. Figure 1 , Figure 4 As shown, the circuit board body 100 has a preset experimental circuit 110, and the experimental circuit 110 mainly realizes circuit connection to realize the preset practical teaching function. Figure 1 , Figure 2 As shown, the magnetic connector 200 is arranged on the circuit board body 100, and the magnetic connector 200 includes a packaging shell 210, a magnetic attraction part 220 and a conductive contact part 230. The conductive contact part 230 is electrically connected to the experimental circuit 110, and the magnetic attraction part 220 is used to magnetically dock with an external magnetic attraction plug. The experimental development board with a magnetic attraction interface is provided with a magnetic attraction connector 200 at the edge of the circuit board body 100, and the position of the conductive contact part 230 is fixed by the packaging shell 210, so as to facilitate accurate docking with the external magnetic attraction connector. In addition, a magnetic attraction part 220 is arranged in the packaging shell 210, and the external magnetic attraction connector is attracted by the magnetic attraction part 220. The magnetic attraction connector 200 and the magnetic attraction connector are attracted and fixed or pulled apart by suction. The external magnetic attraction connector can be attracted and fixed by bringing it close to the magnetic connector 200. The operation is simple, and multiple contacts can be docked and electrically connected by fixing it once, which is more convenient to use. In addition, the magnetic attraction is stable and not easy to loosen, and the problem of poor contact caused by shaking is not easy to occur during use. By providing the magnetic connector 200, the circuit connection process is made simpler, the operation is more standardized, it is not easy to make a wrong connection, and it is more practical. The shortcomings of the signal transmission physical connection interface used in the traditional experimental development board, such as unfriendly plug-in and unplugging, complex wiring, and high connection fragility, are solved.

[0049] The external magnetic connector can be a part of each functional module, or it can be plugged or magnetically connected to each functional module separately. The functional module can be a sensor for realizing various functions, such as temperature, position, image and other sensors, or it can be a button, LED indicator, display or speaker. One end of the external magnetic connector is connected to the circuit board body 100 through the magnetic connector 200, and the other end is connected to the corresponding functional module, so as to obtain a hardware design circuit for realizing the corresponding function.

[0050] like Figure 1 , Figure 2 , Figure 3 As shown, further, in this embodiment, at least two magnetic attraction parts 220 are provided, and at least two magnetic attraction parts 220 are located on both sides of the conductive contact part 230 and have opposite magnetic poles. The two magnetic attraction parts 220 on both sides are arranged in a row with the conductive contact part 230, and the magnetic attraction parts 220 on both sides are designed to have opposite magnetic poles, for example, one pole exposed on the front surface of the packaging shell 210 (or not exposed on the front surface but facing the front surface) on one side is an N pole, and one pole exposed on the front surface of the packaging shell 210 (or not exposed on the front surface but facing the front surface) on the other side is an S pole. The external magnetic attraction connector also adopts a corresponding design, so that the magnetic attraction connection can only be performed when the external magnetic attraction connector and the conductive contact parts 230 of the magnetic attraction connector 200 are correctly matched, and the opposite is repelled, and docking cannot be achieved, thereby realizing the automatic anti-reverse insertion function.

[0051] like Figure 1 , Figure 2 , Figure 3 As shown, further, in this embodiment, a plurality of conductive contact parts 230 are provided, and the plurality of conductive contact parts 230 are arranged in a straight line at intervals. The conductive contact parts 230 specifically include: a metal spring pin contact 231 and a connecting pin 232. The metal spring pin contact 231 is exposed on the front surface of the packaging shell 210, and the connecting pin 232 is L-shaped. One end of the connecting pin 232 is fixed on the rear surface of the packaging shell 210 and connected to the metal spring pin contact 231, and the other end is welded on the circuit board body 100 and electrically connected to the experimental circuit 110. The metal spring pin contact 231 and the connecting pin 232 are both packaged by the packaging shell 210, so that when welding with the circuit board body 100, the magnetic suction connector 200 forms a whole, which is convenient for assembly and welding. The metal spring pin contact 231 has a certain elastic force, so that when making electrical contact with the contact of the external magnetic suction connector, it can be continuously and stably pressed against the contact of the magnetic suction connector to achieve a more stable connection. The metal spring ejector pin contact 231 is an existing PIN contact structure, which is used in various mobile terminals, and the specific structure will not be described in detail.

[0052] Furthermore, in this embodiment, the surface of the conductive contact part 230 exposed from the package shell 210 is provided with a metal coating. In the specific structure, a metal coating is plated on the surface of the metal spring pin contact 231, and the metal coating has high corrosion resistance, wear resistance and high mechanical properties. Thus, the corrosion resistance, mechanical properties and electrical properties of the conductive contact part 230 are improved, so that the metal spring pin contact 231 can be used to transmit level signals.

[0053] like Figure 1 , Figure 2 , Figure 3 As shown, further, in this embodiment, at least four conductive contact parts 230 are provided. In the specific structure, a row of four metal spring pin contacts 231 are exposed on the front surface of the packaging shell 210, and a magnetic attraction part 220 is fixed on both sides of a row of metal spring pin contacts 231. Thus, a signal communication physical interface can be formed, and according to the different lines connected to the four metal spring pin contacts 231 in the experimental circuit 110, different communication protocol circuits and functions can be realized, such as UART, I2C, ADC, GPIO, etc. The details are as follows:

[0054] like Figure 3 As shown in (a), when a GPIO magnetic interface is formed: the four conductive contact parts 230 include: 5V contact, GPIO contact, NC contact, GND contact in sequence. In the specific structure, the magnetic part 220 on one side is the N pole, and the magnetic part 220 on the other side is the S pole. The metal spring pin contact 231 close to the N pole magnetic part 220 (magnet) is designed as a 5V power supply interface, and the metal spring pin contact 231 close to the S pole magnetic part 220 (magnet) is designed as a GND power ground interface; the metal spring pin contact 231 close to the 5V power supply interface is designed as a GPIO signal line interface, and the metal spring pin contact 231 close to the GND power ground interface is not designed. Therefore, from the direction of the N pole magnetic part 220 to the S pole magnetic part 220, the metal spring pin contact 231 is 5V, GPIO, NC, GND in sequence, which together constitute a GPIO magnetic interface. The GPIO magnetic interface can be used for the input and output of digital signals. It can be connected to sensors, buttons, LEDs and other modules to achieve interaction with external modules.

[0055] like Figure 3As shown in (b), when an I2C magnetic interface is formed: the four conductive contact parts 230 include: 5V contact, SCL contact, SDA contact, GND contact in sequence; the metal spring pin contact 231 close to the N-pole magnetic part 220 is designed as a 5V power supply interface, and the metal spring pin contact 231 close to the S-pole magnetic part 220 is designed as a GND power ground interface; from the N-pole magnetic part 220 to the S-pole magnetic part 220, the four metal spring pin contacts 231 are 5V, SCL, SDA, GND in sequence, and together form an I2C magnetic interface. The I2C magnetic interface can be used to connect multiple devices such as sensors, storage devices, and peripheral devices, and supports bidirectional data transmission.

[0056] like Figure 3 As shown in (c), when an ADC magnetic interface is formed: the four conductive contact parts 230 include: 5V contact, ADC contact, NC contact, and GND contact in sequence. In the specific structure, the metal spring pin contact 231 close to the N-pole magnetic part 220 is designed as a 5V power supply interface, and the metal spring pin contact 231 close to the S-pole magnetic part 220 is designed as a GND power ground interface; the metal spring pin contact 231 close to the 5V power supply interface is designed as an ADC signal line interface, and the metal spring pin contact 231 close to the GND power ground interface is not designed. Therefore, from the direction of the N-pole magnetic part 220 to the S-pole magnetic part 220, the metal spring pin contact 231 is 5V, ADC, NC, and GND in sequence, which together constitute an ADC magnetic interface. The ADC magnetic interface can be used to convert analog signals into digital signals for processing by a microprocessor module, and can be used to connect modules such as sensors and sound input devices.

[0057] like Figure 3 As shown in (d), when a UART magnetic interface is formed: the four conductive contact parts 230 include: 5V contact, TX contact, RX contact, and GND contact in sequence. The metal spring pin contact 231 close to the N-pole magnetic part 220 is designed as a 5V power supply interface, and the metal spring pin contact 231 close to the S-pole magnetic part 220 is designed as a GND power ground interface; from the N-pole magnetic part 220 to the S-pole magnetic part 220, the metal spring pin contact 231 close to the 5V power supply interface is designed as a TX signal line interface, and the metal spring pin contact 231 close to the GND power ground interface is designed as an RX signal line interface. The metal spring pin contact 231 is designed as 5V, TX, RX, and GND in sequence, which together form a UART magnetic interface. The UART magnetic interface can be used for serial data transmission, supports asynchronous communication, and can be used to connect external devices such as Wi-Fi, Bluetooth modules, and GPS modules.

[0058] It can also be configured as other types of communication protocol interfaces with multiple metal spring ejector contacts 231 as needed.

[0059] like Figure 1 , Figure 4 As shown, further, in the present embodiment, a plurality of magnetic connectors 200 are provided, and the plurality of magnetic connectors 200 are respectively provided at the periphery of the circuit board body 100. The plurality of magnetic connectors 200 may include one or / and more of the above-mentioned UART magnetic interface, I2C magnetic interface, ADC magnetic interface, and GPIO magnetic interface. Multiple magnetic interfaces of the same type may also be provided. The circuit board body 100 usually adopts a square structure, and therefore has four edges, front, back, left, and right. A plurality of magnetic connectors 200 may be distributed on the four edges, so that more functional modules can be connected, more circuit functions can be realized, and the practicality of the experimental development board can be improved.

[0060] like Figure 1 , Figure 4 As shown, further, in this embodiment, the circuit board body 100 is provided with a double-row multi-pin socket 300 arranged at intervals for plugging in the main control module 310. The double-row multi-pin socket 300 can be set in the middle position on the surface of the circuit board body 100, and the main control module 310 can be a control chip. The control chip is plugged into the circuit board body 100 through the double-row multi-pin socket 300 to achieve connection with the experimental circuit 110, and then electrically connected to each magnetic suction connector 200 through the experimental circuit 110, and then electrically connected to the functional module through the external magnetic suction plug connected to the magnetic suction connector 200, thereby realizing the circuit design function. The double-row multi-pin socket 300 can adopt a double-row 2.54mm pitch 12pin socket, which can support the corresponding ESP32, STM32 or other main control module 310 replacement connection, and connect the various I / O pins of the main control module 310 to the GPIO magnetic suction interface, UART magnetic suction interface, ADC magnetic suction interface and I2C magnetic suction interface through circuit design. Through this circuit design, various interfaces of the main control module 310 are directly brought out through the magnetic connector 200. The interface is clear and can be simply connected by magnetic attraction, avoiding problems such as difficult to find pins and complex interface connections.

[0061] like Figure 1 , Figure 4As shown, further, a power supply interface 320 is provided on the circuit board body 100, and the power supply interface 320 can be directly connected to the double-row multi-pin socket 300, so that the main control module 310 connected to the double-row multi-pin socket 300 can be powered, and each magnetic suction connector 200 can be powered by the main control module 310. The power supply of the magnetic suction connector 200 can also be powered by the 5V power supply interface of the main control module 310. In addition, the power supply interface 320 in the entire experimental development board can also use a USB Type-C interface for 5V power supply.

[0062] like Figure 1 , Figure 4 As shown, further, the power supply interface 320 is electrically connected to the buck chip 321 in the experimental circuit 110, and the buck chip 321 (LDO) is connected to the double-row multi-pin socket 300. The buck chip 321 (LDO) of the power supply part converts the 5V input power into a 3.3V output to drive the USB to serial port module 322 (CH340C), and the USB to serial port module 322 (CH340C) is electrically connected to at least one magnetic suction connector 200, such as a UART magnetic suction interface, so that the receiving and transmitting level signals of the UART magnetic suction interface can be balanced.

[0063] like Figure 1 , Figure 6 As shown, further, the circuit board body 100 in this embodiment is specifically provided with 2 layers. The circuit board body 100 includes: an upper board layer 120 and a lower board layer 130. The upper board layer 120 is used to carry the power supply interface 320, the magnetic suction connector 200, the buck chip 321, the double-row multi-pin socket 300 and the LED power light; the lower board layer 130 is located on one side of the upper board layer 120 and is used to set the routing of the experimental circuit 110. The layout size of the circuit board body 100 in this embodiment is 14cm×10cm, and a 2-layer board design is adopted, in which the upper board layer 120 is mainly used to place the main control module 310 socket interface, the power buck chip 321, the LED power light, the metal spring ejector and other devices; the lower board layer 130 is mainly used for the routing of the experimental circuit 110, and other devices are placed nearby according to the function and routing convenience. The key signal routing follows the impedance matching and equal length requirements. In this way, the circuit routing is not easy to be confused, which is convenient for production and manufacturing and more practical.

[0064] The magnetic attraction part 220 in this embodiment can be a cylindrical magnet. The entire magnetic attraction part 220 can be wrapped by the packaging shell 210, or the front end of the magnetic attraction part 220 can be exposed, so that the magnetic attraction force is larger and the magnetic attraction is more stable.

[0065] like Figure 2 , Figure 5As shown, the magnetic attraction portion 220 may also adopt other structures, for example, the magnetic attraction portion 220 specifically includes: a hemispherical boss 221 and an extension column 223. The hemispherical boss 221 has a magnetic attraction end face 222 facing away from the side of the circuit board body 100, so the front surface of the hemispherical boss 221 is a plane to form the magnetic attraction end face 222, and the magnetic attraction end face 222 is exposed from the front surface of the packaging shell 210. The extension column 223 is connected to the side of the hemispherical boss 221 facing away from the magnetic attraction end face 222, and the diameter of the hemispherical boss 221 is greater than the diameter of the extension column 223. The hemispherical boss 221 with a larger diameter is used, so that the front end of the magnetic attraction portion 220 forms a larger volume, which generates a greater magnetic attraction force, and a more stable fixation is achieved through the strong connection of the magnetic attraction portion 220, thereby providing additional connection stability to ensure that the interface will not accidentally fall off or loosen during use. And because the diameter of the extension column 223 at the rear end is small, a groove 224 is formed at the connection between the hemispherical boss 221 and the extension column 223. When the packaging shell 210 is formed by injection molding, the part of the packaging shell 210 filled in the groove 224 is matched and embedded in the groove 224, thereby achieving a more stable fixation of the magnetic attraction part 220 and the packaging shell 210.

[0066] like Figure 2 , Figure 5 As shown, the outer contour of the hemispherical boss 221 can be a major arc 225 (a small section), and the portion of the packaging shell 210 at this location cooperates with the curved major arc 225 to achieve front and rear limit stops, making the magnetic attraction portion 220 more stably fixed.

[0067] The packaging shell 210 is bonded and fixed on the surface of the circuit board body 100. By bonding and fixing the packaging shell 210, when the external magnetic plug is unplugged from the magnetic connector 200, the circuit board body 100 supports the magnetic connector 200, thereby preventing the tension from being concentrated on the L-shaped connecting pin 232, thereby causing the solder joint of the L-shaped connecting pin 232 to loosen.

[0068] like Figure 1 , Figure 6 As shown, to ensure that the solder joint of the connecting pin 232 will not fall off. A positioning hole 140 is opened on the surface of the circuit board body 100, and a positioning boss 211 is set on the bottom surface of the packaging shell 210. The positioning boss 211 is embedded in the positioning hole 140 to limit the packaging shell 210 and the magnetic connector 200. By docking the positioning boss 211 and the positioning hole 140, and then bonding and fixing the packaging shell 210, it is convenient to install the magnetic connector 200 on the circuit board body 100, and secondly, the connection between the magnetic connector 200 and the circuit board body 100 is relatively stable. In the process of transmitting the plug-in and pull-out pulling force, the solder joints of the connecting pin 232 and the experimental circuit 110 will not be driven.

[0069] In summary, the present invention proposes an experimental development board with a magnetic interface, and the experimental development board includes an experimental magnetic expansion hardware circuit of a UART magnetic interface, an I2C magnetic interface, an ADC magnetic interface, and a GPIO magnetic interface. This experimental development board adopts a magnetic interface in the form of easy plugging and unplugging, is simple and easy to use, and adopts a metal spring ejector pin as a contact point, which can easily connect by magnetic suction, making the connection operation simpler and suitable for the frequent plugging and unplugging of the development board in the experimental environment. The magnetic connector is fixed by a strong magnet and can provide additional connection stability through a special enhanced magnetic design, ensuring that the interface will not accidentally fall off or loosen during use, and has strong stability; at the same time, the opposite magnetic pole design of the magnetic part can also play the advantage of automatic anti-reverse plugging of the interface, ensuring the reliability of signal transmission. A metal coating is set on the surface of the metal spring ejector pin contact, which has a long service life, can withstand frequent plugging and unplugging and use, and reduces the risk of interface damage; at the same time, the maximum operating voltage allowed by the magnetic interface is 12V, and the maximum operating current is 2A. This allowable range can usually meet the needs of most experimental development boards and is suitable for connecting various types of sensors, actuators or other peripheral modules. The interface is easy to expand and has strong compatibility. The magnetic interface circuit design used in this experimental development board can be simply expanded by performing the same circuit wiring to meet the remaining communication interfaces between modules in the experimental development board, such as PWM, SPI, CAN, DAC and other interfaces.

[0070] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An experimental development board with a magnetic interface, characterized in that: include: A circuit board body, wherein the circuit board body has a preset experimental circuit; A magnetic attraction connector, which is arranged on the circuit board body and includes a packaging shell, a magnetic attraction portion and a conductive contact portion; The conductive contact portion is electrically connected to the experimental circuit; The magnetic attraction portion is used for magnetically docking with an external magnetic attraction plug.

2. The experimental development board with a magnetic interface according to claim 1, characterized in that: At least two magnetic attraction parts are provided, and at least two magnetic attraction parts are located on both sides of the conductive contact part and have opposite magnetic poles.

3. The experimental development board with a magnetic interface according to claim 2, characterized in that: The conductive contact portions are provided in plurality, and the plurality of conductive contact portions are arranged at intervals along a straight line; The conductive contact portion includes: a metal spring ejector contact, wherein the metal spring ejector contact is exposed on the front surface of the packaging shell; A connecting pin, the connecting pin is L-shaped, one end of the connecting pin is fixed to the rear surface of the packaging shell and connected to the metal spring ejector contact, and the other end is welded on the circuit board body and electrically connected to the experimental circuit; A metal plating layer is disposed on a surface of the conductive contact portion exposed from the packaging shell.

4. The experimental development board with a magnetic interface according to claim 1, characterized in that: The conductive contact parts are provided with at least 4; The four conductive contact parts include: a 5V contact, a GPIO contact, a NC contact, and a GND contact in sequence; Alternatively, the four conductive contacts include, in sequence: a 5V contact, an SCL contact, an SDA contact, and a GND contact; Alternatively, the four conductive contacts include, in sequence: a 5V contact, an ADC contact, an NC contact, and a GND contact; Alternatively, the four conductive contact portions include in sequence: a 5V contact, a TX contact, a RX contact, and a GND contact.

5. The experimental development board with a magnetic interface according to claim 4, characterized in that: There are multiple magnetic connectors, and the multiple magnetic connectors are respectively arranged at the periphery of the circuit board body.

6. The experimental development board with a magnetic interface according to claim 1, characterized in that: The magnetic attraction portion includes: a hemispherical boss, the hemispherical boss having a magnetic attraction end surface facing away from one side of the circuit board body; An extension column connected to a side of the hemispherical boss away from the magnetic end surface; The diameter of the hemispherical boss is greater than the diameter of the extended column.

7. The experimental development board with a magnetic interface according to claim 1, characterized in that: The packaging shell is bonded and fixed on the surface of the circuit board body.

8. The experimental development board with a magnetic interface according to claim 7, characterized in that: A positioning hole is opened on the surface of the circuit board body, and a positioning boss is arranged on the bottom surface of the packaging shell. The positioning boss is embedded in the positioning hole to limit the packaging shell and the magnetic attraction connector.

9. The experimental development board with a magnetic interface according to any one of claims 1 to 8, characterized in that: The circuit board body is provided with a power supply interface, and the power supply interface is electrically connected to the step-down chip in the experimental circuit; The circuit board body is provided with double-row multi-pin sockets arranged at intervals for plugging in the main control module.

10. The experimental development board with a magnetic interface according to claim 9, characterized in that: The circuit board body comprises: an upper board layer, the upper board layer is used to carry the power supply interface, the magnetic attraction connector, the step-down chip, the double-row multi-pin socket and the LED power light; The lower board layer is located on one side of the upper board layer and is used to set the routing of the experimental circuit.

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