Posture detection circuit and intelligent terminal

Abstract

The utility model relates to the technical field of intelligent control, in particular to a posture detection circuit and an intelligent terminal. According to the attitude detection circuit, a hardware circuit of the attitude detection circuit is improved, the filter circuit is arranged, and the characteristics of the filter circuit can be changed by adjusting the values of a resistor and a capacitor, so that different application requirements are met. Meanwhile, in combination with the characteristics of signal acquisition of the attitude detection unit, the filtering unit can filter interference signals to the greatest extent, so that the attitude detection accuracy is improved, the interference signals can be filtered to a great extent, and the situation that the control unit generates wrong reminding information due to signal interference is avoided; therefore, the interference to the user in the use process is reduced, and the use experience is improved.

Description

Technical Field

[0001] This application relates to the field of intelligent control technology, specifically to an attitude detection circuit and an intelligent terminal. Background Technology

[0002] With today's fast-paced lifestyle and busy work schedules, many people spend long hours sitting at their desks, leading to various health problems. As smart wearable devices rapidly develop, many health monitoring algorithms are being applied to these devices to monitor people's health. For example, smart wearable devices can detect a person's posture and remind them to get up and move around when they have been sitting for too long.

[0003] The inventors of this application discovered in their research that although current smart wearable devices can monitor human posture to a certain extent, they often suffer from low monitoring accuracy, causing great inconvenience to users. Utility Model Content

[0004] In view of the above problems, embodiments of this application provide an attitude detection circuit and a smart terminal to solve the above-mentioned technical problems existing in the prior art.

[0005] One aspect of this application provides an attitude detection circuit, which includes an attitude detection unit, a filtering unit, and a control unit.

[0006] The posture detection unit is used to collect human motion signals, generate a collection signal, and send the collection signal to the filtering unit through the collection signal output terminal;

[0007] The filtering unit includes an operational amplifier circuit and an RC circuit; one end of the RC circuit is electrically connected to the inverting input terminal of the operational amplifier circuit, and the other end of the RC circuit is electrically connected to the output terminal of the operational amplifier circuit.

[0008] The inverting input terminal of the operational amplifier circuit is also electrically connected to the acquisition signal output terminal of the attitude detection unit for receiving the acquisition signal; the output terminal of the operational amplifier circuit is also electrically connected to the acquisition signal input terminal of the attitude detection unit for sending the filtered acquisition signal to the attitude detection unit, so that the attitude detection unit performs analog-to-digital conversion on the filtered acquisition signal to generate an attitude data signal; the non-inverting input terminal of the operational amplifier circuit is grounded.

[0009] The data input terminal of the control unit is connected to the attitude data output terminal of the attitude detection unit, and is used to receive the attitude data signal output by the attitude detection unit and generate attitude information based on the attitude data signal.

[0010] Preferably, in some embodiments, the attitude detection unit includes a six-axis accelerometer.

[0011] Preferably, in some embodiments, the six-axis accelerometer is electrically connected to the control unit via an SPI interface.

[0012] Preferably, in some embodiments, the RC circuit includes: a first resistor, a second resistor, a first capacitor, and a second capacitor; the operational amplifier circuit includes an operational amplifier.

[0013] One end of the first resistor and one end of the first capacitor are electrically connected to the signal acquisition output terminal, and the other end of the first resistor is electrically connected to the inverting input terminal of the operational amplifier; the other end of the first capacitor is grounded.

[0014] The second resistor and the second capacitor are connected in parallel. One end of the second resistor is electrically connected to the inverting input terminal of the operational amplifier through the first resistor. One end of the second capacitor is electrically connected to the inverting input terminal of the operational amplifier. The other end of the second resistor and the other end of the second capacitor are respectively electrically connected to the output terminal of the operational amplifier.

[0015] Preferably, in some embodiments, the RC circuit further includes a third resistor, one end of which is electrically connected to the inverting input terminal of the operational amplifier through the first resistor, and the other end of which is electrically connected to the acquisition signal output terminal of the attitude detection unit.

[0016] Preferably, in some embodiments, the RC circuit further includes a fourth resistor and a third capacitor;

[0017] One end of the fourth resistor is electrically connected to one end of the third resistor and one end of the third capacitor, and the other end of the fourth resistor is electrically connected to the signal acquisition output terminal; the other end of the third capacitor is grounded.

[0018] Preferably, in some embodiments, a vibration unit is also included;

[0019] The vibration unit includes a motor driver and a linear motor. The input control port of the motor driver is electrically connected to the control unit and is used to receive motor control signals sent by the control unit.

[0020] The output control port of the motor driver is electrically connected to the linear motor and is used to control the linear motor.

[0021] Preferably, in some embodiments, a display unit is also included;

[0022] The display unit includes a display controller and a display screen. The input control port of the display controller is electrically connected to the control unit and is used to receive display control signals sent by the control unit.

[0023] The output control port of the display controller is electrically connected to the display screen and is used to control the display screen.

[0024] Preferably, in some embodiments, a buzzer unit is also included;

[0025] The buzzer unit includes a transistor and a buzzer. The base of the transistor is electrically connected to the control unit, the collector of the transistor is electrically connected to one end of the buzzer, and the emitter of the transistor is grounded.

[0026] The other end of the buzzer is connected to a power source.

[0027] In another aspect of the embodiments of this application, a smart terminal is also proposed, the smart terminal including the attitude detection circuit described in any one of the above embodiments.

[0028] In summary, this application embodiment improves the hardware circuit of the attitude detection circuit by incorporating a filtering circuit. By adjusting the values ​​of resistors and capacitors, the characteristics of the filtering circuit can be altered to meet different application requirements. Furthermore, considering the characteristics of the signals acquired by the attitude detection unit, this filtering unit can filter out interference signals to the greatest extent possible, improving the accuracy of attitude detection. It can largely filter out interference signals, preventing the control unit from generating incorrect alerts due to signal interference, thereby reducing interference experienced by the user and improving the user experience.

[0029] The above description is merely an overview of the technical solutions of the embodiments of this application. In order to better understand the technical means of the embodiments of this application and to implement them in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the embodiments of this application more obvious and understandable, specific implementation methods of this application are described below. Attached Figure Description

[0030] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0031] Figure 1 A schematic diagram of the attitude detection circuit provided in an embodiment of this application is shown;

[0032] Figure 2 A circuit diagram of the attitude detection unit provided in an embodiment of this application is shown;

[0033] Figure 3A circuit diagram of the filtering unit provided in an embodiment of this application is shown;

[0034] Figure 4 A circuit diagram of the control unit provided in an embodiment of this application is shown;

[0035] Figure 5 A circuit diagram of the vibration unit provided in an embodiment of this application is shown;

[0036] Figure 6 A circuit diagram of the buzzer unit provided in an embodiment of this application is shown;

[0037] Figure 7 A circuit diagram of a display unit provided in an embodiment of this application is shown.

[0038] Figure label:

[0039] 10. Attitude detection unit; 20. Filtering unit; 21. Operational amplifier circuit; 22. RC circuit; 30. Control unit; 31. Vibration unit; 32. Buzzer unit; 33. Display unit

[0040] Operational amplifier Q1, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, first capacitor C1, second capacitor C2, third capacitor C3, current limiting resistor R21, pull-up resistor R12, transistor Q2, buzzer BEEP, motor driver MOT. Detailed Implementation

[0041] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0043] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0044] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0045] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0046] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0047] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0049] Smart wearable devices with posture detection capabilities typically consist of a data acquisition device and an alert device. By collecting posture data of the human body from standing to sitting and from sitting to standing, the data is transmitted to the control unit for processing. The control unit identifies whether the user is standing or sitting by running a sedentary reminder algorithm and reminds the user based on the algorithm's recognition results.

[0050] The inventors of this application discovered in their research that existing posture detection functions rely more on software algorithms. When the posture data acquired by the data acquisition device is interfered with, the analysis results of the detection algorithm will have very large errors, leading to false alerts to users and interfering with their normal work and life.

[0051] In view of this, this application proposes an attitude detection circuit and a smart terminal. By improving the hardware circuit of the attitude detection circuit, a filtering unit is added in addition to the attitude detection unit. When the attitude detection unit acquires the acquisition signal corresponding to the user's attitude data, it does not directly send the acquisition signal to the control unit for algorithm analysis. Instead, it first sends the acquired signal to the filtering unit. The filtering unit filters the acquired signal through an operational amplifier and an RC circuit to remove interference signals before sending it to the attitude detection unit. The attitude detection unit converts the filtered acquisition signal to generate an attitude data signal and sends it to the control unit. The software algorithm on the control unit analyzes the attitude data signal to generate attitude information, so that the control unit can remind the user based on the attitude information. By setting up a filtering unit to filter the acquisition signal acquired by the attitude detection unit, interference signals can be largely filtered out, avoiding the control unit from generating incorrect reminder information due to signal interference, thereby reducing interference to the user during use and improving the user experience.

[0052] like Figure 1 The diagram shows a schematic of the attitude detection circuit proposed in an embodiment of this application. The attitude detection circuit includes an attitude detection unit 10, a filtering unit 20, and a control unit 30.

[0053] The posture detection unit 10 is used to collect human motion signals, generate a collection signal, and send the collection signal to the filtering unit through the collection signal output terminal. The filtering unit 20 includes an operational amplifier circuit 21 and an RC circuit 22. One end of the RC circuit 22 is electrically connected to the inverting input terminal of the operational amplifier circuit 21, and the other end of the RC circuit 22 is electrically connected to the output terminal of the operational amplifier circuit 21. The inverting input terminal of the operational amplifier circuit 21 is also electrically connected to the collection signal output terminal of the posture detection unit 10 to receive the collection signal. The output terminal of the operational amplifier circuit 21 is also electrically connected to the collection signal input terminal of the posture detection unit 10 to send the filtered collection signal to the posture detection unit 10, so that the posture detection unit 10 performs analog-to-digital conversion on the filtered collection signal to generate a posture data signal. The non-inverting input terminal of the operational amplifier circuit 21 is grounded. The data input terminal of the control unit 30 is connected to the posture data output terminal of the posture detection unit 10 to receive the posture data signal output by the posture detection unit 10 and generate posture information based on the posture data signal.

[0054] like Figure 1 As shown, the posture detection unit 10 is used to detect the posture of the human body. For example, when the user's posture changes from standing to sitting, from sitting to standing, or from stillness to walking, the posture detection unit 10 will collect relevant posture change data and generate a collection signal.

[0055] Preferably, the attitude detection unit 10 can be a six-axis accelerometer, also known as a six-degree-of-freedom (6DoF) sensor or inertial measurement unit (IMU), which is a sensor capable of measuring the linear acceleration and angular velocity of an object in three-dimensional space. It typically includes three accelerometers and three gyroscopes. The accelerometers measure the linear acceleration of the object in three-dimensional space, while the gyroscopes measure the angular velocity. By combining the data from these two sensors, the attitude, position, and velocity information of the object in three-dimensional space can be obtained. The control unit performs algorithmic analysis on the attitude, position, and velocity information to obtain the human body's attitude information. The six-axis accelerometer can use existing chips, such as the STM LSM6DS3 chip or the BMI160 chip. After the attitude detection unit 10 generates the human body's acquisition signal, it sends the acquired signal to the filtering unit 20 through the acquisition signal output terminal. The acquired signal is an analog signal.

[0056] Figure 2A pin diagram of a commonly used six-axis accelerometer chip is shown. In this embodiment, FIT_IN is the acquisition signal output terminal and FIT_OUT is the acquisition signal input terminal. The six-axis accelerometer chip is connected to the filtering unit 20 through the FIT_IN and FIT_OUT pins. It outputs the acquisition signal to the filtering unit 20 through FIT_IN and receives the filtered acquisition signal output by the filtering unit 20 through FIT_OUT.

[0057] Preferably, the six-axis accelerometer is also electrically connected to the control unit 30 via an SPI interface. The SPI interface is a high-speed, full-duplex, synchronous communication bus, mainly used for short-distance communication between microcontrollers and various peripheral devices. The six-axis accelerometer includes SPI_G_MISO pins, SPI_G_MOSI pins, and SPI_G_CLK pins, wherein the SPI_G_MISO pin and the SPI_G_MOSI pin are attitude data output and attitude data input terminals, respectively, used for data interaction with the control unit 30, and the SPI_G_CLK pin provides clock synchronization information.

[0058] like Figure 1 and Figure 3 As shown, the filtering unit 20 is mainly used to filter the acquired signal obtained by the attitude detection unit 10, filter out the noise part in the acquired signal, and improve the accuracy of the acquired signal.

[0059] The filtering unit 20 includes an operational amplifier circuit 21 and an RC circuit 22, which are combined to process the acquired signal. The operational amplifier circuit 21 is a high-gain electronic voltage amplifier whose output voltage is proportional to the input voltage. Together with the RC circuit 22, they constitute the filtering unit 20.

[0060] like Figure 3As shown, the operational amplifier circuit 21 includes an operational amplifier Q1. The operational amplifier Q1 and the RC circuit 22 form an active low-pass filter, wherein the operational amplifier Q1 provides gain and constitutes the active part of the filter unit 20. The RC circuit 22 includes multiple RC networks. The first resistor R1 and the first capacitor C1 form the first RC network; the second resistor R2 and the second capacitor C2 form the second RC network. One end of the first resistor R1 and one end of the first capacitor C1 are electrically connected to the acquisition signal output terminal of the attitude detection unit 10, and the other end of the first resistor R1 is electrically connected to the inverting input terminal of the operational amplifier Q1; the other end of the first capacitor C1 is grounded; the first resistor R1 and the first capacitor C1 form the first RC network, and this second RC network determines the Q factor and peak frequency of the filter unit. The second resistor R2 is connected in parallel with the second capacitor C2. One end of the second resistor R2 is electrically connected to the inverting input terminal of the operational amplifier Q1 through the first resistor R1. One end of the second capacitor C2 is electrically connected to the inverting input terminal of the operational amplifier. The other ends of the second resistor R2 and the other ends of the second capacitor C2 are respectively electrically connected to the output terminal of the operational amplifier Q1. The second resistor R2 and the second capacitor C2 together determine the cutoff frequency of the filter unit and also provide DC bias for the inverting input terminal of the operational amplifier Q1.

[0061] Continue to refer to Figure 3 The RC circuit 22 also includes a third resistor R3. One end of the third resistor R3 is electrically connected to the inverting input of the operational amplifier Q1 through the first resistor R1, and the other end of the third resistor R3 is electrically connected to the acquisition signal output of the attitude detection unit 10. The third resistor R3, together with the first resistor R1, determines the Q factor of the filter unit 20, and it also forms part of the feedback network, affecting the gain of the filter unit 20.

[0062] Furthermore, the RC circuit 22 also includes another RC network, which includes a fourth resistor R4 and a third capacitor C3. One end of the fourth resistor R4 is electrically connected to one end of the third resistor and one end of the third capacitor C3, and the other end of the fourth resistor R4 is electrically connected to the signal acquisition output terminal of the attitude detection unit 10. The other end of the third capacitor C3 is grounded. This RC network can further affect the frequency response of the filtering unit and also constitutes the input path of the input signal, affecting the input impedance.

[0063] After filtering the analog acquisition signal output by the attitude detection unit 10, the filtering unit 20 resends the filtered acquisition signal to the attitude detection unit 10. The attitude detection unit 10 performs analog-to-digital conversion on the filtered acquisition signal to generate an attitude data signal, and then sends the attitude data signal to the control unit 30.

[0064] Continue to refer to Figure 4 The control unit 30 is an MCU, such as an STM32 series. This control unit 30 is connected to the SPI_G_MISO, SPI_G_MOSI, and SPI_G_CLK pins of the six-axis accelerometer via pins P0_15, P0_16, and P0_17, respectively, for data interaction with the six-axis accelerometer. The control unit 30 runs an attitude detection algorithm. For example, when the control unit 30 receives attitude data signals from the attitude detection unit 10, it reads the attitude data, filters and fuses it. When an attitude (standing-sitting) is identified, a timer is started. If the user does not stand up and move around (sitting-standing) after the timer reaches a user-set threshold (default is 1 hour), the control unit 30 can issue a prolonged sitting reminder to encourage the user to move around. If the user stands up and moves around before the preset time, completing the sitting-standing posture transition, the timer is reset. The timer will only start again when the user stands-sits.

[0065] In summary, the above embodiments, by improving the hardware circuitry of the attitude detection circuit, create a low-pass filter circuit with a specific cutoff frequency and Q factor. By adjusting the values ​​of resistors and capacitors, the characteristics of the filter can be changed to meet different application requirements. Furthermore, considering the characteristics of the signals acquired by the attitude detection unit, this filter unit can filter out interference signals to the greatest extent, improving the accuracy of attitude detection. It can largely filter out interference signals, avoiding the generation of incorrect alerts by the control unit due to signal interference, thereby reducing interference experienced by the user and improving the user experience.

[0066] Furthermore, in some embodiments of this application, after the attitude detection unit detects the user's attitude data, in order to better remind the user and improve the user experience, the attitude detection circuit further includes a vibration unit 31, such as... Figure 5 As shown, the vibration unit 31 includes a motor driver MOT and a linear motor. The input control port MOT_EN of the motor driver MOT is electrically connected to the control unit and is used to receive motor control signals sent by the control unit. The output control port VIN of the motor driver is electrically connected to the linear motor and is used to control the linear motor.

[0067] For example, during use, when the control unit 30 generates a sedentary reminder signal, the control unit 30 will send the sedentary reminder signal to the motor driver MOT of the vibration unit 31 to start the motor driver MOT. The motor driver MOT generates a motor drive signal to drive the linear motor to generate vibration and provide vibration reminder to the user.

[0068] Furthermore, to further improve the user experience, the attitude detection circuit may also include a buzzer unit 32; such as Figure 6 As shown, the buzzer unit 32 includes a transistor Q2 and a buzzer BEEP. The base of the transistor Q2 is electrically connected to the control unit 30, the collector of the transistor Q2 is electrically connected to one end of the buzzer BEEP, and the emitter of the transistor Q2 is grounded. The other end of the buzzer BEEP is connected to a power supply.

[0069] Figure 4 and Figure 6 In this configuration, the P0_2 pin of the control unit 30 is electrically connected to the BEE_EN pin of the buzzer unit 32. The transistor Q2 is an NPN transistor, and its base is electrically connected to the control unit 30 through a current-limiting resistor R21. The base of transistor Q2 is also grounded through a pull-up resistor R12. When the control unit 30 generates a sedentary reminder signal, it sends a high-level signal to the BEE_EN pin of the buzzer unit 32. This turns on the transistor Q2, grounding one end of the buzzer BEEP. Since the other end of the buzzer BEEP is connected to the power supply, the buzzer BEEP conducts, generating a buzzing sound to remind the user. Figure 5 As shown, the buzzer unit 32 also includes filter capacitors C21, C22, and C23. One end of each filter capacitor is connected to the base of transistor Q2, and the other end is grounded. This provides diverse user alert methods and improves the user experience.

[0070] To provide more diverse reminders for user posture, this embodiment also includes a display unit 33; such as... Figure 7 As shown, the display unit 33 includes a display controller and a display screen. The input control port of the display controller is electrically connected to the control unit and is used to receive display control signals and display data sent by the control unit. The output control port of the display controller is electrically connected to the display screen and is used to control the display screen. When the control unit outputs a sedentary reminder control signal, the display screen will light up and display a message such as "You have been sitting for a long time, get up and move around" to remind the user. In this way, diverse user reminder methods are provided, improving the user experience.

[0071] Another embodiment of this application provides a smart terminal, which includes the posture detection circuit described in any of the above embodiments, for detecting the user's posture and reminding the user. The smart terminal can be a smartphone, smartwatch, smart bracelet, etc., and is not limited in this embodiment.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. An attitude detection circuit, characterized in that, Attitude detection unit, filtering unit, and control unit; The posture detection unit is used to collect human motion signals, generate a collection signal, and send the collection signal to the filtering unit through the collection signal output terminal; The filtering unit includes an operational amplifier circuit and an RC circuit; one end of the RC circuit is electrically connected to the inverting input terminal of the operational amplifier circuit, and the other end of the RC circuit is electrically connected to the output terminal of the operational amplifier circuit. The inverting input terminal of the operational amplifier circuit is also electrically connected to the acquisition signal output terminal of the attitude detection unit for receiving the acquisition signal; the output terminal of the operational amplifier circuit is also electrically connected to the acquisition signal input terminal of the attitude detection unit for sending the filtered acquisition signal to the attitude detection unit, so that the attitude detection unit performs analog-to-digital conversion on the filtered acquisition signal to generate an attitude data signal; the non-inverting input terminal of the operational amplifier circuit is grounded. The data input terminal of the control unit is electrically connected to the attitude data output terminal of the attitude detection unit, and is used to receive the attitude data signal output by the attitude detection unit and generate attitude information based on the attitude data signal.

2. The attitude detection circuit according to claim 1, characterized in that, The attitude detection unit includes a six-axis accelerometer.

3. The attitude detection circuit according to claim 2, characterized in that, The six-axis accelerometer is electrically connected to the control unit via an SPI interface.

4. The attitude detection circuit according to claim 1, characterized in that, The RC circuit includes: a first resistor, a second resistor, a first capacitor, and a second capacitor; the operational amplifier circuit includes an operational amplifier. One end of the first resistor and one end of the first capacitor are electrically connected to the signal acquisition output terminal, and the other end of the first resistor is electrically connected to the inverting input terminal of the operational amplifier; the other end of the first capacitor is grounded. The second resistor and the second capacitor are connected in parallel. One end of the second resistor is electrically connected to the inverting input terminal of the operational amplifier through the first resistor. One end of the second capacitor is electrically connected to the inverting input terminal of the operational amplifier. The other end of the second resistor and the other end of the second capacitor are respectively electrically connected to the output terminal of the operational amplifier.

5. The attitude detection circuit according to claim 4, characterized in that, The RC circuit further includes a third resistor, one end of which is electrically connected to the inverting input terminal of the operational amplifier through the first resistor, and the other end of which is electrically connected to the acquisition signal output terminal of the attitude detection unit.

6. The attitude detection circuit according to claim 5, characterized in that, The RC circuit also includes a fourth resistor and a third capacitor; One end of the fourth resistor is electrically connected to one end of the third resistor and one end of the third capacitor, and the other end of the fourth resistor is electrically connected to the signal acquisition output terminal; the other end of the third capacitor is grounded.

7. The attitude detection circuit according to claim 1, characterized in that, It also includes a vibration unit; The vibration unit includes a motor driver and a linear motor. The input control port of the motor driver is electrically connected to the control unit and is used to receive motor control signals sent by the control unit. The output control port of the motor driver is electrically connected to the linear motor and is used to control the linear motor.

8. The attitude detection circuit according to claim 1, characterized in that, It also includes a display unit; The display unit includes a display controller and a display screen. The input control port of the display controller is electrically connected to the control unit and is used to receive display control signals sent by the control unit. The output control port of the display controller is electrically connected to the display screen and is used to control the display screen.

9. The attitude detection circuit according to claim 1, characterized in that, It also includes a buzzer unit; The buzzer unit includes a transistor and a buzzer. The base of the transistor is electrically connected to the control unit, the collector of the transistor is electrically connected to one end of the buzzer, and the emitter of the transistor is grounded. The other end of the buzzer is connected to a power source.

10. A smart terminal, characterized in that, Includes the attitude detection circuit as described in any one of claims 1-9.

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