Electronic compasses

Abstract

The utility model discloses a kind of electronic compasses, including handheld fixed part and the left compass leg and right compass leg of hinged in the lower end of handheld fixed part, handheld fixed part inside is fixedly arranged with the PCB board of button cell, display J1, magnetic encoding sensor U4, MCU chip U5, function switch SW1 are integrated on the PCB board, the inside of the upper end of left compass leg is provided with strong magnet, the inside of the upper end of right compass leg is provided with magnetic induction sensor, the position of strong magnet and magnetic induction sensor is set on same vertical axis, and the vertical axis coincides with the hinged axis center line of left compass leg and right compass leg. The utility model realizes compass intelligentization by integrating magnetic induction sensor and display screen, and length, angle and two-point distance can be accurately measured by adjusting two feet, and data is real-time displayed without conversion. Integrated communication interface supports mobile phone / cloud connection, realizes data automatic acquisition and long-term tracking, and provides efficient solution for surveying and mapping operation.

Description

Technical Field

[0001] This utility model relates to the field of mathematical tool design and manufacturing technology, specifically to a high-precision electronic compass for measuring angles, radii, and distances. Background Technology

[0002] With the development of electronic teaching and electronic tools, traditional compasses, rulers, and set squares are no longer suitable for practical teaching. They are rigid in use, have large reading errors, and are not easy for students to master in actual use, making it difficult to obtain the desired angle and diameter values.

[0003] For example, when using traditional compasses for drawing, if I want to draw a 30° angle, I basically need to use a compass and set square together, and I also need a certain amount of geometric knowledge to make a 30° angle. This process is extremely complicated. This is very inconvenient and cannot meet the goal of rapid learning in teaching. How to conveniently and quickly obtain a desired angle and dimension has become an urgent problem for us to solve. Utility Model Content

[0004] To address the shortcomings of existing technologies, this invention provides an electronic compass that facilitates the measurement of angles and distances.

[0005] To achieve the above objectives, the technical solution adopted by this utility model to solve its technical problem is as follows: an electronic compass, including a hand-held fixing part and a left compass leg and a right compass leg hinged to the lower end of the hand-held fixing part. A PCB board with a button battery is fixedly installed inside the hand-held fixing part. The PCB board integrates a display J1, a magnetic encoding sensor U4, an MCU chip U5, and a function switch SW1. A strong magnet is provided on the inner side of the upper end of the left compass leg, and a magnetic induction sensor is provided on the inner side of the upper end of the right compass leg. The strong magnet and the magnetic induction sensor are positioned on the same vertical axis, and the vertical axis coincides with the hinge axis of the left compass leg and the right compass leg.

[0006] This utility model further provides an electronic compass, the hand-held fixing part of which consists of a face cover and a bottom cover. A handle is provided at the top of both the face cover and the bottom cover. Relief slots are provided on both sides of the bottom of both the face cover and the bottom cover. A raised first mounting pin is fixedly provided on the inner wall of the face cover inside the two relief slots. A raised second mounting pin is fixedly provided on the inner wall of the bottom cover inside the two relief slots. A first pin hole is provided on the outer side of the upper end of the left compass leg. A mounting ring groove is also provided on the outer end face of the pin hole. A left arm rubber pad is fitted in the mounting ring groove. The left compass leg is hinged to the first mounting pin shaft through the first pin hole. The left arm rubber pad is located between the left compass leg and the inner side wall of the cover. A second pin hole is opened on the outer side of the upper end of the right compass leg. A mounting ring groove is also provided on the outer end face of the second pin hole. A right arm rubber pad is fitted in the mounting ring groove. The right compass leg is hinged to the second mounting pin shaft through the second pin hole. The right arm rubber pad is located between the right compass leg and the inner side wall of the bottom cover.

[0007] This utility model further provides an electronic compass, wherein the upper inner sides of the left and right compass legs are provided with recessed grooves. The magnetic induction sensor is fixedly installed in the recessed groove on the upper inner side of the right compass leg, and the strong magnet is fixedly installed in the recessed groove on the upper inner side of the left compass leg. Limiting blocks are respectively provided at the top outer side of the upper end of the left and right compass legs. A first positioning protrusion is provided on the inner wall of the cover directly above the first mounting pin. When the limiting block at the top outer side of the left compass leg abuts against the first positioning protrusion, the angle between the left compass leg and the handle is zero. A second positioning protrusion is provided on the inner wall of the bottom cover directly above the second mounting pin. When the limiting block at the top outer side of the right compass leg abuts against the second positioning protrusion, the angle between the right compass leg and the handle is zero.

[0008] This utility model further provides an electronic compass, in which the face cover and the bottom cover are fixed by screws after assembly. In the assembled and fixed face cover and bottom cover, the axes of the first mounting pin and the second mounting pin coincide. The inner groove on the upper inner side of the left compass leg and the inner groove on the upper inner side of the right compass leg interlock to form a groove cavity structure. A wiring clearance groove is provided on the side of the groove opening of the inner groove on the right compass leg.

[0009] The present invention further provides an electronic compass, wherein a battery loading and unloading port is provided on the rear side of the bottom cover outside the button battery mounting position on the PCB board, and a battery cover is provided inside the battery loading and unloading port. One end of the battery cover is snapped onto one side of the battery loading and unloading port by a buckle, and the other side is fixed by an ear hole and a battery cover locking screw.

[0010] The present invention further provides an electronic compass, wherein a surface mount connector J8 and a programming port J6 are integrated on the PCB board. The first pin of the surface mount connector J8 is electrically connected to the fifth pin of the MCU chip U5, the second pin of the surface mount connector J8 is electrically connected to the seventh pin of the MCU chip U5, the third pin of the surface mount connector J8 is electrically connected to the fourth pin of the MCU chip U5, the fourth pin of the surface mount connector J8 is electrically connected to the twelfth pin of the MCU chip U5, the fifth pin of the surface mount connector J8 is connected to its fourth pin, and the sixth pin of the surface mount connector J8 is connected to its first pin.

[0011] Specifically, pin 1 of programming port J6 is electrically connected to pin 6 of MCU chip U5, pin 2 of programming port J6 is electrically connected to pin 14 of MCU chip U5, pin 3 of programming port J6 is electrically connected to pin 15 of MCU chip U5, pin 4 of programming port J6 is electrically connected to pin 1 of MCU chip U5, and pin 5 of programming port J6 is electrically connected to pin 4 of MCU chip U5.

[0012] This utility model further provides an electronic compass, wherein pin 1 of display J1 is connected in series with voltage divider resistor R1 and then electrically connected to pin 20 of MCU chip U5; pin 2 of display J1 is connected in series with voltage divider resistor R2 and then electrically connected to pin 19 of MCU chip U5; pin 3 of display J1 is connected in series with voltage divider resistor R3 and then electrically connected to pin 18 of MCU chip U5; pin 4 of display J1 is connected in series with voltage divider resistor R4 and then electrically connected to pin 17 of MCU chip U5; pin 5 of display J1 is connected in series with voltage divider resistor R5 and then electrically connected to pin 16 of MCU chip U5; and pin 6 of display J1 is connected in series with voltage divider resistor R6 and then electrically connected to pin 13 of MCU chip U5.

[0013] This utility model further provides an electronic compass, wherein pin 2 of the magnetic coding sensor U4 is connected to pin 8, a resistor R7 is connected in series between pin 3 and pin 8 of the magnetic coding sensor U4, pin 3 of the magnetic coding sensor U4 is electrically connected to pin 7 of the MCU chip U5, a resistor R8 is connected in series between pin 5 and pin 8 of the magnetic coding sensor U4, pin 5 of the magnetic coding sensor U4 is electrically connected to pin 5 of the MCU chip U5, pin 8 of the magnetic coding sensor U4 is connected in series with capacitor C2 and then electrically connected to pin 4 of the MCU chip U5, pins 11, 12, and 13 of the magnetic coding sensor U4 are all electrically connected to pin 4 of the MCU chip U5, pin 15 of the magnetic coding sensor U4 is electrically connected to pin 12 of the MCU chip U5, and a capacitor C3 is connected in series between pin 12 and pin 4 of the MCU chip U5.

[0014] This utility model further provides an electronic compass, wherein the positive terminal of the function switch SW1 is electrically connected to pin 10 of the MCU chip U5, pin 6 of the MCU chip U5 is connected to the positive terminal of the function switch SW1 after being connected in series with resistor R11, the negative terminal of the function switch SW1 is connected to pin 4 of the MCU chip U5, pin 6 of the MCU chip U5 is connected to pin 1 of the MCU chip U5 after being connected in series with resistor R9, and a capacitor C5 is connected in series between pin 1 and pin 4 of the MCU chip U5.

[0015] This utility model further provides an electronic compass, whose magnetic induction sensor is a magnetic induction sensor with an integrated 3D gyroscope module, which is electrically connected to the patch connector J8 via a ribbon cable.

[0016] The beneficial effects of this utility model are as follows: By innovatively introducing a magnetic coding sensor and a display screen, this utility model has upgraded the traditional compass to an intelligent level. When in use, only the width between the two compass legs needs to be adjusted. The magnetic induction sensor and magnetic coding sensor of the 3D gyroscope module can accurately capture data and directly display the angle and length values ​​on the display screen, completely eliminating the tedious mathematical conversion process. This tool can not only conveniently measure the straight-line distance between two points, but also accurately set a specific angle between the two legs, or quickly measure the included angle between two existing points, realizing the unification of measurement and drawing. In addition, its integrated multi-functional communication interface can easily connect and transmit data with mobile phones, the cloud, and servers, providing strong technical support for realizing automatic and real-time data acquisition and long-term tracking. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present utility model. Figure 1 ;

[0019] Figure 2 This is a schematic diagram of the overall structure of the present utility model. Figure 2 ;

[0020] Figure 3 Structural breakdown of this utility model Figure 1 ;

[0021] Figure 4 Structural breakdown of this utility model Figure 2 ;

[0022] Figure 5 This is a circuit structure block diagram of the present invention;

[0023] Figure 6 This is a schematic diagram of the connection circuit of the MCU chip U5 of this utility model;

[0024] Figure 7 This is a schematic diagram of the connection circuit structure of the magnetic encoder sensor U4 of this utility model;

[0025] Figure 8 This is a schematic diagram of the connection circuit of the functional switch SW1 of this utility model;

[0026] Figure 9 This is a schematic diagram of the connection circuit of the display J1 of this utility model;

[0027] Figure 10 This is a schematic diagram of the circuit structure for the programming port J6 of this utility model;

[0028] Figure 11 This is a schematic diagram of the J8 patch connector connection circuit of this utility model;

[0029] Figure 12 This is a schematic diagram showing the positional relationship between the two magnetic Hall effect sensing modules disposed inside the magnetic induction sensor 5 and the strong magnet 4 in this embodiment of the present invention.

[0030] In the diagram: 1. Handheld fixing part; 2. Left compass leg; 3. Right compass leg; 4. Strong magnet; 5. Magnetic induction sensor; 6. Face cover; 7. Bottom cover; 8. Hand handle; 9. Clearance groove; 10. First mounting pin; 12. Second mounting pin; 13. First pin hole; 14. Left arm rubber pad; 15. Second pin hole; 16. Right arm rubber pad; 17. First positioning protrusion; 18. Second positioning protrusion; 19. Wiring clearance groove; 20. Battery cover; 21. Battery cover locking screw. Detailed Implementation

[0031] The preferred embodiments of the present invention will be described below with reference to specific implementation methods. It should be understood that the preferred embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention.

[0032] like Figures 1 to 4 As shown, an electronic compass includes a handheld fixing part 1 and a left compass leg 2 and a right compass leg 3 hinged to the lower end of the handheld fixing part 1. A PCB board with a button battery is fixedly installed inside the handheld fixing part 1. The PCB board is characterized by integrating a display J1, a magnetic encoding sensor U4, an MCU chip U5, and a function switch SW1. A strong magnet 4 is provided on the inner side of the upper end of the left compass leg 2, and a magnetic induction sensor 5 is provided on the inner side of the upper end of the right compass leg 3. The strong magnet 4 and the magnetic induction sensor 5 are positioned on the same vertical axis, and the vertical axis coincides with the hinge axis of the left compass leg 2 and the right compass leg 3.

[0033] Preferably, the hand-held fixing part consists of a face cover 6 and a bottom cover 7. A hand handle 8 is provided at the top of both the face cover 6 and the bottom cover 7. Relief slots 9 are provided on both sides of the bottom of the face cover 6 and the bottom cover 7. A protruding first mounting pin 10 is fixedly provided on the inner wall of the face cover 6 inside the two relief slots 9. A protruding second mounting pin 12 is fixedly provided on the inner wall of the bottom cover 7 inside the two relief slots 9. A first pin hole 13 is provided on the outer side of the upper end of the left compass leg 2, and the first pin hole 13 is located on the outer end face of the first pin hole 13. An installation ring groove is also provided, in which a left arm rubber pad 14 is fitted. The left compass leg 2 is hinged to the first mounting pin 10 through the first pin hole 13. The left arm rubber pad 14 is located between the left compass leg 2 and the inner wall of the cover 6. The upper outer side of the right compass leg 3 is provided with a second pin hole 15, and an installation ring groove is also provided on the outer end face of the second pin hole 15. The right arm rubber pad 16 is fitted in the installation ring groove. The right compass leg 3 is hinged to the second mounting pin 12 through the second pin hole 15. The right arm rubber pad 16 is located between the right compass leg 3 and the inner wall of the bottom cover 7.

[0034] Preferably, both the upper inner side of the left compass leg 2 and the upper inner side of the right compass leg 3 are provided with recessed grooves. The magnetic induction sensor 5 is fixedly installed in the recessed groove on the upper inner side of the right compass leg 3. The strong magnet 4 is fixedly installed in the recessed groove on the upper inner side of the left compass leg 2. Limiting blocks are respectively provided at the top outer side of the upper end of the left compass leg 2 and the top outer side of the upper end of the right compass leg 3, located directly above the first mounting pin 10. A first positioning protrusion 17 is provided on the inner wall of the cover 6. When the limiting block at the top outer side of the upper end of the left compass leg 2 abuts against the first positioning protrusion 17, the angle between the left compass leg 2 and the handle 8 is zero. A second positioning protrusion 18 is provided on the inner wall of the bottom cover 7 located directly above the second mounting pin 12. When the limiting block at the top outer side of the upper end of the right compass leg 3 abuts against the second positioning protrusion 18, the angle between the right compass leg 3 and the handle 8 is zero.

[0035] Preferably, the face cover 6 and the bottom cover 7 are fixed by screws after assembly. In the assembled and fixed face cover 6 and bottom cover 7, the axes of the first mounting pin 10 and the second mounting pin 12 coincide. The inner groove on the upper inner side of the left compass leg 2 and the inner groove on the upper inner side of the right compass leg 3 interlock to form a groove cavity structure. A wiring clearance groove 19 is provided on the side of the groove opening of the inner groove on the right compass leg 3.

[0036] Preferably, the bottom cover 7 has a battery loading and unloading port on the rear side outside the button battery mounting position on the PCB board. A battery cover 20 is provided inside the battery loading and unloading port. One end of the battery cover 20 is snapped onto one side of the battery loading and unloading port by a buckle, and the other side is fixed by an ear hole and a battery cover locking screw 21.

[0037] like Figures 5 to 11 As shown, the display part mainly communicates with the display via serial port through the MCU chip. Specifically, the display is an LCD screen, which displays working information such as output angle and length, so that users can understand the working status in a timely and convenient manner.

[0038] The power supply uses a button battery, which has low power interference and stable voltage. The Bluetooth module, WIFI module, 4G communication module and NFC communication module are all integrated into the MCU chip. These communication modules are mainly used to facilitate the connection between the compass and mobile phones and servers, thereby enabling real-time data upload.

[0039] The temperature sensor detects the internal temperature of the machine in real time. The magnetic induction sensor supplements the temperature readings to achieve accurate measurement at different temperatures.

[0040] Because the magnetic induction sensor integrates a 3D gyroscope module, it can easily measure the motion state of a compass, thereby measuring the speed and distance of the compass's movement, and calculating parameters such as the angle, length, and radius of the drawn circle.

[0041] The magnetic induction sensor and the high-strength magnet are respectively designed and fixed on one leg of the compass, and the high-strength magnet and the magnetic induction sensor are on the same vertical axis. When the two legs of the compass rotate, a change in the induction intensity is generated on the magnetic induction sensor. This tiny change is received by the magnetic induction sensor and converted into a digital signal. Through a specific encoding method, the signal is transmitted to an external MCU chip via a serial port. The MCU chip then uploads the signal to terminals such as mobile phones, host computers, and servers through WIFI modules, Bluetooth modules, 4G communication modules, NFC communication modules, etc., thereby realizing real-time data acquisition and monitoring.

[0042] Preferably, the PCB board also integrates a surface mount connector J8 and a programming port J6, wherein pin 1 of surface mount connector J8 is electrically connected to pin 5 of MCU chip U5, pin 2 of surface mount connector J8 is electrically connected to pin 7 of MCU chip U5, pin 3 of surface mount connector J8 is electrically connected to pin 4 of MCU chip U5, pin 4 of surface mount connector J8 is electrically connected to pin 12 of MCU chip U5, pin 5 of surface mount connector J8 is connected to pin 4, and pin 6 of surface mount connector J8 is connected to pin 1.

[0043] Specifically, pin 1 of programming port J6 is electrically connected to pin 6 of MCU chip U5, pin 2 of programming port J6 is electrically connected to pin 14 of MCU chip U5, pin 3 of programming port J6 is electrically connected to pin 15 of MCU chip U5, pin 4 of programming port J6 is electrically connected to pin 1 of MCU chip U5, and pin 5 of programming port J6 is electrically connected to pin 4 of MCU chip U5.

[0044] Preferably, pin 1 of display J1 is connected in series with voltage divider resistor R1 and then electrically connected to pin 20 of MCU chip U5; pin 2 of display J1 is connected in series with voltage divider resistor R2 and then electrically connected to pin 19 of MCU chip U5; pin 3 of display J1 is connected in series with voltage divider resistor R3 and then electrically connected to pin 18 of MCU chip U5; pin 4 of display J1 is connected in series with voltage divider resistor R4 and then electrically connected to pin 17 of MCU chip U5; pin 5 of display J1 is connected in series with voltage divider resistor R5 and then electrically connected to pin 16 of MCU chip U5; and pin 6 of display J1 is connected in series with voltage divider resistor R6 and then electrically connected to pin 13 of MCU chip U5.

[0045] Preferably, pin 2 of the magnetic coded sensor U4 is connected to pin 8; a resistor R7 is connected in series between pin 3 and pin 8 of the magnetic coded sensor U4; pin 3 of the magnetic coded sensor U4 is electrically connected to pin 7 of the MCU chip U5; a resistor R8 is connected in series between pin 5 and pin 8 of the magnetic coded sensor U4; pin 5 of the magnetic coded sensor U4 is electrically connected to pin 5 of the MCU chip U5; pin 8 of the magnetic coded sensor U4 is connected in series with capacitor C2 and then electrically connected to pin 4 of the MCU chip U5; pins 11, 12, and 13 of the magnetic coded sensor U4 are all electrically connected to pin 4 of the MCU chip U5; pin 15 of the magnetic coded sensor U4 is electrically connected to pin 12 of the MCU chip U5; and a capacitor C3 is connected in series between pin 12 and pin 4 of the MCU chip U5.

[0046] Preferably, the positive terminal of the function switch SW1 is electrically connected to pin 10 of the MCU chip U5, pin 6 of the MCU chip U5 is connected to the positive terminal of the function switch SW1 after being connected in series with resistor R11, the negative terminal of the function switch SW1 is connected to pin 4 of the MCU chip U5, pin 6 of the MCU chip U5 is connected to pin 1 of the MCU chip U5 after being connected in series with resistor R9, and a capacitor C5 is connected in series between pin 1 and pin 4 of the MCU chip U5.

[0047] Preferably, the magnetic induction sensor 5 is a magnetic induction sensor with an integrated 3D gyroscope module, which is electrically connected to the patch connector J8 via a ribbon cable.

[0048] The principle of the magnetic induction algorithm in this embodiment is as follows: The magnetic induction sensor 5 converts the collected magnetic change signal into a digital signal and transmits it to the magnetic encoding sensor. Then, the information is sent to the MCU chip for technical processing through a specific encoding format. The magnetic induction sensor 5 is equipped with two magnetic Hall effect sensing modules, which are placed at a 90-degree angle at the edge of the magnetic induction sensor 5 hardware. The specific positions are as follows: Figure 12 As shown in the figure, let the two magnetic Hall effect sensor modules be the X sensor module and the Y sensor module respectively. When the strong magnet is placed as shown in the figure below, the magnetic field lines passing through the Y sensor module are the most numerous, and the magnetic induction intensity is the strongest, Bmax. The X sensor module is placed parallel to the strong magnet, and the magnetic field lines passing through it are zero.

[0049] When a strong magnet rotates counterclockwise by an angle θ, the magnetic flux density in the Y-sensor module is By, and the magnetic flux density in the X-sensor module is Bx. Then:

[0050] By = Bmax * cosθ;

[0051] Bx = Bmax * Sinθ;

[0052] Then: tgθ=Bx / By

[0053] That is, by measuring the magnetic induction intensity of the X and Y modules, the deflection angle of the strong magnet can be calculated accordingly.

[0054] A magnetic induction sensor and a strong magnet are combined into a magnetic induction detection assembly. When the position of the strong magnet or the magnetic induction sensor changes, it causes a change in the magnetic induction intensity. The change in angle θ is calculated from this change in magnetic induction intensity, thus achieving angle measurement. This signal is simultaneously transmitted to the MCU chip, which outputs it to the LCD screen, which displays the angle information. Since the lengths of the two legs of the compass are fixed, the distance LAB between the endpoints of the two legs is also fixed. Therefore, LAB = length of the compass leg * 2 * sin(θ / 2). Similarly, the radius of the drawn circle is R = LAB.

[0055] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0056] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An electronic compass, comprising a hand-held fixing part (1) and a left compass leg (2) and a right compass leg (3) hinged to the lower end of the hand-held fixing part (1), wherein a PCB board with a button battery is fixedly disposed inside the hand-held fixing part (1), characterized in that, The PCB board integrates a display J1, a magnetic encoder sensor U4, an MCU chip U5, and a function switch SW1. A strong magnet (4) is provided on the inner side of the upper end of the left compass leg (2), and a magnetic induction sensor (5) is provided on the inner side of the upper end of the right compass leg (3). The strong magnet (4) and the magnetic induction sensor (5) are located on the same vertical axis, and the vertical axis coincides with the hinge axis of the left compass leg (2) and the right compass leg (3).

2. The electronic compass according to claim 1, characterized in that, The hand-held fixing part consists of a face cover (6) and a bottom cover (7). A hand handle (8) is provided on the top of both the face cover (6) and the bottom cover (7). Relief slots (9) are provided on both sides below the face cover (6) and the bottom cover (7). A protruding first mounting pin (10) is fixedly provided on the inner wall of the face cover (6) inside the two relief slots (9) on the face cover (6). A protruding second mounting pin (12) is fixedly provided on the inner wall of the bottom cover (7) inside the two relief slots (9) on the bottom cover (7). A first pin hole (13) is provided on the outer side of the upper end of the left compass leg (2), and the first pin hole (13) is located on the outer end face of the first pin hole (13). An installation ring groove is also provided, in which a left arm rubber pad (14) is fitted. The left compass leg (2) is hinged to the first mounting pin (10) through the first pin hole (13). The left arm rubber pad (14) is located between the left compass leg (2) and the inner wall of the cover (6). The upper outer side of the right compass leg (3) is provided with a second pin hole (15), and an installation ring groove is also provided on the outer end face of the second pin hole (15). The installation ring groove is fitted with a right arm rubber pad (16). The right compass leg (3) is hinged to the second mounting pin (12) through the second pin hole (15). The right arm rubber pad (16) is located between the right compass leg (3) and the inner wall of the bottom cover (7).

3. An electronic compass according to claim 2, characterized in that, The upper inner side of the left compass leg (2) and the upper inner side of the right compass leg (3) are both provided with recessed grooves. The magnetic induction sensor (5) is fixedly installed in the recessed groove provided on the upper inner side of the right compass leg (3). The strong magnet (4) is fixedly installed in the recessed groove provided on the upper inner side of the left compass leg (2). Limiting blocks are respectively provided on the upper outer top of the left compass leg (2) and the upper outer top of the right compass leg (3). The cover (6) is located directly above the first mounting pin (10). A first positioning protrusion (17) is provided on the inner wall. When the limiting block at the top outer side of the upper end of the left compass leg (2) abuts against the first positioning protrusion (17), the angle between the left compass leg (2) and the hand handle (8) is zero. A second positioning protrusion (18) is provided on the inner wall of the bottom cover (7) located directly above the second mounting pin (12). When the limiting block at the top outer side of the upper end of the right compass leg (3) abuts against the second positioning protrusion (18), the angle between the right compass leg (3) and the hand handle (8) is zero.

4. An electronic compass according to claim 3, characterized in that, After the top cover (6) and bottom cover (7) are assembled, they are fixed by screws. In the assembled and fixed top cover (6) and bottom cover (7), the axes of the first mounting pin (10) and the second mounting pin (12) coincide. The inner groove on the upper inner side of the left compass leg (2) and the inner groove on the upper inner side of the right compass leg (3) are interlocked to form a groove cavity structure. A wiring clearance groove (19) is provided on the side of the groove opening of the inner groove on the right compass leg (3).

5. An electronic compass according to claim 4, characterized in that, The bottom cover (7) has a battery loading and unloading port on the rear side of the button battery mounting position on the PCB board. A battery cover (20) is provided inside the battery loading and unloading port. One end of the battery cover (20) is snapped onto one side of the battery loading and unloading port by a buckle, and the other side is fixed by an ear hole and a battery cover locking screw (21).

6. An electronic compass according to claim 1 or 5, characterized in that, The PCB board also integrates a surface mount connector J8 and a programming port J6. Pin 1 of surface mount connector J8 is electrically connected to pin 5 of MCU chip U5, pin 2 of surface mount connector J8 is electrically connected to pin 7 of MCU chip U5, pin 3 of surface mount connector J8 is electrically connected to pin 4 of MCU chip U5, pin 4 of surface mount connector J8 is electrically connected to pin 12 of MCU chip U5, pin 5 of surface mount connector J8 is connected to pin 4 of surface mount connector J8, and pin 6 of surface mount connector J8 is connected to pin 1 of surface mount connector J8. Specifically, pin 1 of programming port J6 is electrically connected to pin 6 of MCU chip U5, pin 2 of programming port J6 is electrically connected to pin 14 of MCU chip U5, pin 3 of programming port J6 is electrically connected to pin 15 of MCU chip U5, pin 4 of programming port J6 is electrically connected to pin 1 of MCU chip U5, and pin 5 of programming port J6 is electrically connected to pin 4 of MCU chip U5.

7. An electronic compass according to claim 6, characterized in that, Pin 1 of the display J1 is connected in series with a voltage divider resistor R1 and then electrically connected to pin 20 of the MCU chip U5. Pin 2 of the display J1 is connected in series with a voltage divider resistor R2 and then electrically connected to pin 19 of the MCU chip U5. Pin 3 of the display J1 is connected in series with a voltage divider resistor R3 and then electrically connected to pin 18 of the MCU chip U5. Pin 4 of the display J1 is connected in series with a voltage divider resistor R4 and then electrically connected to pin 17 of the MCU chip U5. Pin 5 of the display J1 is connected in series with a voltage divider resistor R5 and then electrically connected to pin 16 of the MCU chip U5. Pin 6 of the display J1 is connected in series with a voltage divider resistor R6 and then electrically connected to pin 13 of the MCU chip U5.

8. An electronic compass according to claim 7, characterized in that, Pin 2 of the magnetic coded sensor U4 is connected to pin 8. A resistor R7 is connected in series between pin 3 and pin 8 of the magnetic coded sensor U4. Pin 3 of the magnetic coded sensor U4 is electrically connected to pin 7 of the MCU chip U5. A resistor R8 is connected in series between pin 5 and pin 8 of the magnetic coded sensor U4. Pin 5 of the magnetic coded sensor U4 is electrically connected to pin 5 of the MCU chip U5. Pin 8 of the magnetic coded sensor U4 is connected in series with capacitor C2 and then electrically connected to pin 4 of the MCU chip U5. Pins 11, 12, and 13 of the magnetic coded sensor U4 are all electrically connected to pin 4 of the MCU chip U5. Pin 15 of the magnetic coded sensor U4 is electrically connected to pin 12 of the MCU chip U5. A capacitor C3 is connected in series between pin 12 and pin 4 of the MCU chip U5.

9. An electronic compass according to claim 8, characterized in that, The positive terminal of the function switch SW1 is electrically connected to pin 10 of the MCU chip U5. Pin 6 of the MCU chip U5 is connected to the positive terminal of the function switch SW1 after being connected in series with resistor R11. The negative terminal of the function switch SW1 is connected to pin 4 of the MCU chip U5. Pin 6 of the MCU chip U5 is connected to pin 1 of the MCU chip U5 after being connected in series with resistor R9. A capacitor C5 is connected in series between pin 1 and pin 4 of the MCU chip U5.

10. An electronic compass according to claim 9, characterized in that, The magnetic induction sensor (5) is a magnetic induction sensor with an integrated 3D gyroscope module, which is electrically connected to the patch connector J8 via a ribbon cable.

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