Fingerprint module and intelligent door lock for two-way communication

Abstract

The utility model discloses a kind of fingerprint module and intelligent door lock of dual-path communication, fingerprint module includes fingerprint identification circuit, first communication circuit, second communication circuit;First communication circuit is respectively with main control MCU and fingerprint identification circuit, for the data communication and encryption between fingerprint identification circuit and main control MCU, and remote upgrade is carried out to fingerprint identification circuit;Second communication circuit is respectively with main control MCU and fingerprint identification circuit, for when first communication circuit is abnormal, complete the data communication and encryption between fingerprint identification circuit and main control MCU, and remote upgrade is carried out to fingerprint identification circuit.Remote upgrade is carried out to fingerprint identification circuit, can when program software appears bug, remote OTA upgrade is carried out, improve user experience, solve the problem that single communication mode exists in prior art, data is easily leaked in intelligent door lock.

Description

Technical Field

[0001] This utility model relates to the field of communication technology for smart door locks, and in particular to a dual-channel communication fingerprint module and smart door lock. Background Technology

[0002] Common communication methods for smart locks include UART, I2C, and SPI. UART communication only involves basic serial port command communication with the fingerprint module. When the fingerprint biometric template is stored in the fingerprint module, the fingerprint biometric features are also stored there. It only supports simple feature encryption algorithms, making it vulnerable to attacks from malicious actors who can steal fingerprint biometric features and leak user information. I2C communication is similar to UART; the fingerprint template data is stored in the fingerprint module, making it susceptible to attacks from malicious actors who can steal fingerprint biometric features and leak user information. Furthermore, I2C is the only communication method for remote software upgrades, and its slow transmission rate (maximum only 400 kbit / s) means it's rarely used for remote upgrades. SPI communication integrates the algorithm program within the lock's main control MCU, providing only a single communication method. A problem with any of these communication lines can easily lead to fingerprint communication issues. Utility Model Content

[0003] In existing technologies, smart door locks suffer from problems such as limited communication methods and the ease with which data can be leaked.

[0004] To address the aforementioned issues, a dual-communication fingerprint module and smart lock are proposed. Through a first communication circuit and a second communication circuit, with the second circuit serving as a backup, fingerprint data can be processed in emergencies. The first and second communication circuits are used for data communication and encryption between the fingerprint recognition circuit and the main control MCU. The main control MCU can remotely upgrade the fingerprint recognition circuit, enabling OTA upgrades when software bugs occur. This improves the user experience and solves the problems of single communication methods and easy data leakage in existing smart lock technologies.

[0005] Firstly, a dual-channel communication fingerprint module includes:

[0006] Fingerprint recognition circuit;

[0007] First communication circuit;

[0008] Second communication circuit;

[0009] The first communication circuit is connected to both the main control MCU and the fingerprint recognition circuit, and is used for data communication and encryption between the fingerprint recognition circuit and the main control MCU, and for remotely upgrading the fingerprint recognition circuit.

[0010] The second communication circuit is connected to both the main control MCU and the fingerprint recognition circuit. When the first communication circuit malfunctions, it completes data communication and encryption between the fingerprint recognition circuit and the main control MCU, and performs remote upgrades to the fingerprint recognition circuit.

[0011] In conjunction with the dual-communication fingerprint module described in the first aspect of this utility model, in a first possible embodiment, the first communication circuit includes an SPI communication processing chip, and the second communication circuit includes an I2C communication processing chip.

[0012] In conjunction with the dual-channel communication fingerprint module described in the first aspect of this utility model, in a first possible embodiment, the fingerprint recognition circuit includes:

[0013] Capacitive sensor;

[0014] Fingerprint processing chip;

[0015] The capacitive sensor is electrically connected to the fingerprint processing chip.

[0016] In conjunction with the first possible embodiment of the first aspect of this utility model, in the second possible embodiment, the fingerprint recognition circuit further includes:

[0017] Anti-interference circuit;

[0018] The anti-interference circuit and the fingerprint processing chip are used to handle static electricity and voltage fluctuation interference.

[0019] In conjunction with the second possible implementation of the first aspect of this utility model, and in the third possible implementation, the anti-interference circuit includes:

[0020] Antistatic TVS tube;

[0021] First capacitor;

[0022] The first end of the anti-static TVS tube is connected to the first end of the first capacitor and then electrically connected to the fingerprint processing chip. The second end of the anti-static TVS tube and the second end of the first capacitor are respectively grounded.

[0023] In conjunction with the third possible embodiment of the first aspect of this utility model, in the fourth possible embodiment, the fingerprint recognition circuit further includes:

[0024] First power supply processing circuit;

[0025] The first power processing circuit is electrically connected to the fingerprint processing chip.

[0026] In conjunction with the fourth possible embodiment of the first aspect of this utility model, in the fifth possible embodiment, the fingerprint recognition circuit further includes:

[0027] Second power supply processing circuit;

[0028] The second power processing circuit is electrically connected to the fingerprint processing chip.

[0029] Secondly, a smart door lock includes the dual-communication fingerprint module described in the first aspect, and further includes:

[0030] Main control MCU;

[0031] The fingerprint recognition circuit, the first communication circuit, and the second communication circuit are electrically connected to the main control MCU.

[0032] In conjunction with the smart door lock described in the second aspect of this utility model, in a first possible embodiment, the smart door lock further includes:

[0033] System power supply circuit;

[0034] The system power supply circuit is electrically connected to the first communication circuit and the fingerprint recognition circuit respectively, and is used to provide independent power to the first communication circuit and the fingerprint recognition circuit respectively.

[0035] In conjunction with the first possible implementation of the second aspect of this utility model, in the second possible implementation, the system power supply circuit is also electrically connected to the second communication circuit and the fingerprint recognition circuit respectively, for independently powering the second communication circuit and the fingerprint recognition circuit respectively.

[0036] The fingerprint module and smart lock with dual communication described in this utility model utilize a first communication circuit and a second communication circuit, with the second communication circuit serving as a backup circuit. This allows for emergency processing of fingerprint data. By employing the first and second communication circuits to facilitate data communication and encryption between the fingerprint recognition circuit and the main control MCU, and by remotely upgrading the fingerprint recognition circuit via the main control MCU, remote OTA upgrades can be performed when software bugs occur. This improves the user experience and solves the problems of single communication methods and easy data leakage in existing smart locks. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the module connection of the smart door lock in this utility model;

[0039] Figure 2 This is a circuit diagram of the first communication circuit in this utility model;

[0040] Figure 3 This is a circuit diagram of the second communication circuit in this utility model;

[0041] Figure 4 This is a circuit diagram of the fingerprint recognition circuit in this utility model. Detailed Implementation

[0042] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, other embodiments obtained by those skilled in the art without creative effort are all within the scope of protection of this utility model.

[0043] 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 invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0044] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 this application and simplifying the description, and do not 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 this application.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0047] In existing technologies, smart door locks suffer from problems such as limited communication methods and the ease with which data can be leaked.

[0048] To address the aforementioned issues, a dual-channel communication fingerprint module and smart door lock are proposed.

[0049] Firstly, a dual-communication fingerprint module, such as... Figure 1 , Figure 1 This is a schematic diagram of the module connection of the smart door lock of this utility model, including a fingerprint recognition circuit, a first communication circuit, and a second communication circuit. The first communication circuit is connected to both the main control MCU and the fingerprint recognition circuit, and is used for data communication and encryption between the fingerprint recognition circuit and the main control MCU, as well as for remote upgrades of the fingerprint recognition circuit. The second communication circuit is also connected to both the main control MCU and the fingerprint recognition circuit, and is used to complete data communication and encryption between the fingerprint recognition circuit and the main control MCU when the first communication circuit malfunctions, and to remotely upgrade the fingerprint recognition circuit. Remote upgrades of the fingerprint recognition circuit can be performed via OTA (Over-The-Air) updates when software bugs occur, improving the user experience and solving the problems of single communication methods and easy data leakage in existing smart door locks.

[0050] Implementing this embodiment can solve the traditional single-communication problem, improve data rate for remote fingerprint module upgrades, address the pain points of fingerprint biometric module encryption upgrades, and resolve fingerprint communication and recognition failures caused by poor contact in a set of lines. During early trial production, some bugs appeared in the product. The product can be remotely upgraded via the host computer by transmitting code over the network during use at the user's home, without requiring unlocking or returning to the factory. This effectively solves after-sales product upgrade issues, making after-sales maintenance more convenient and achieving high efficiency in remote OTA upgrades. It also solves the upgrade difficulties encountered during the repair process due to fingerprint software bugs. If I2C communication fails, another slave device can update the software via SPI, achieving multi-machine communication between the master and backup systems.

[0051] In this embodiment, as Figure 2-3 , Figure 2 This is a circuit diagram of the first communication circuit in this utility model. Figure 3 This is a circuit diagram of the second communication circuit in this utility model; the circuit structure of the first communication circuit is as follows. Figure 2 As shown, in Figure 2 The U2PL8376 is an SPI communication microprocessor, serving as the fingerprint algorithm communication microprocessor 1. It interacts with the fingerprint recognition circuit via SPI data and commands through pins such as FP_SPI_INT. Remote OTA upgrades are also primarily handled through this communication, as its data transfer rate can reach 8MB / s, enabling rapid remote firmware updates. Figure 2In the circuit diagram, C1 and C7 are MCU power supply filter capacitors, serving as power supply decoupling filters. Pins 16 and 17 of the communication chip U2 are connected to UART_TX and UART_RX serial communication ports, connecting to the main control MCU processor for serial data exchange. Pin 1 of U2 is the power enable pin, pin 3 is the SPI clock pin, pin 4 is the SPI data output pin, pin 5 is the SPI data input pin, pin 7 is the SPI chip select pin, and pin 8 is the SPI interrupt input pin for SPI data exchange. The first communication circuit uses SPI to communicate with the fingerprint module, featuring high transmission speed, suitable for remote user program data updates.

[0052] The circuit structure of the second communication circuit is as follows: Figure 3 As shown, in Figure 3 In this circuit, U9 is an I2C communication microprocessor, and fingerprint algorithm communication microprocessor 2 interacts with the fingerprint recognition circuit via I2C data and commands through pins such as I2C_SDA. Remote OTA upgrades also rely on this communication channel for secondary communication (serving as backup), as its data transmission rate is low, reaching a maximum of only 400 Kbit / s, thus playing an auxiliary role. This communication interface will only be activated if the SPI communication line of the primary communication circuit malfunctions. Figure 3 C2, C3, C4, and C8 are decoupling filter capacitors for the power supply, which serve to filter out power supply interference waves. Figure 3 The U1 SY7528 is an I2C communication microprocessor that performs I2C algorithm communication and data transmission with the fingerprint module, playing a secondary role, commonly referred to as a backup system. The entire system only activates the U9 I2C communication circuit when the U2 SPI communication becomes inaccessible or data communication fails. It also utilizes the I2C line for remote user program updates, although the update speed is slightly slower, but this does not affect normal user operation.

[0053] In one possible implementation, such as Figure 4 , Figure 4 This is a circuit diagram of the fingerprint recognition circuit in this utility model. The fingerprint recognition circuit includes a capacitive sensor and a fingerprint processing chip U95; the capacitive sensor and the fingerprint processing chip U95 are electrically connected.

[0054] In one possible implementation, the fingerprint recognition circuit further includes an anti-interference circuit; the anti-interference circuit and the fingerprint processing chip U95 are used to handle electrostatic and voltage fluctuation interference.

[0055] In one possible implementation, the anti-interference circuit includes an anti-static TVS diode ED15 and a first capacitor C311; the first terminal of the anti-static TVS diode ED15 and the first terminal of the first capacitor C311 are connected together and then electrically connected to the fingerprint processing chip, and the second terminal of the anti-static TVS diode ED15 and the second terminal of the first capacitor C311 are respectively grounded.

[0056] In one possible implementation, the fingerprint recognition circuit further includes a first power processing circuit; the first power processing circuit is electrically connected to the fingerprint processing chip U95.

[0057] In this embodiment, the first power processing circuit includes a processing chip U89 and its peripheral circuits.

[0058] In one possible implementation, the fingerprint recognition circuit further includes a second power processing circuit; the second power processing circuit is electrically connected to the fingerprint processing chip U95.

[0059] In this embodiment, the second power processing circuit includes a processing chip U1 and its peripheral circuits.

[0060] Figure 4 U1 and U89 are dual-power LDOs for power switching. U95 is the FP086 fingerprint processing chip, integrating I2C and SPI communication for fingerprint algorithm processing, and an external sensor chip for image acquisition. C462, C311, C561, C5, and C6 are power supply filter capacitors, and R1 and R2 are pull-up resistors at the enable pin to maintain a stable enable level and prevent jumps. ED15 is an anti-static TVS diode for electrostatic protection.

[0061] In this embodiment, a secure and stable multi-machine communication system is achieved using a circuit design with three MCUs. Dual communication is implemented, ensuring that a problem in any one communication channel does not affect the normal communication and recognition of fingerprint biometrics, guaranteeing normal fingerprint biometric identification. This is an innovative multi-channel communication technology solution for fingerprint module recognition systems. Through a first communication circuit and a second communication circuit (the second circuit serving as a backup), fingerprint data can be processed urgently. The first and second communication circuits are used for data communication and encryption between the fingerprint recognition circuit and the main control MCU, and remote upgrades of the fingerprint recognition circuit are also possible. Remote OTA upgrades can be performed when software bugs occur, improving user experience and solving the problems of single communication methods and easy data leakage in existing smart door locks.

[0062] Secondly, a smart door lock, such as Figure 1The fingerprint module includes a dual-channel communication module and a main control MCU; the fingerprint recognition circuit, the first communication circuit, and the second communication circuit are electrically connected to the main control MCU.

[0063] In one possible implementation, the smart lock further includes a system power supply circuit; the system power supply circuit is electrically connected to the first communication circuit and the fingerprint recognition circuit respectively, and is used to independently power the first communication circuit and the fingerprint recognition circuit.

[0064] In one possible implementation, the system power supply circuit is also electrically connected to the second communication circuit and the fingerprint recognition circuit respectively, for independently supplying power to the second communication circuit and the fingerprint recognition circuit respectively.

[0065] In this embodiment, the MCU chip U2 of the first communication circuit, which handles SPI communication, is responsible for communication with the fingerprint module of the entire system under default conditions. The MCU chip U9 of the first communication circuit, which handles I2C communication, only initiates I2C communication when the SPI communication line fails and communication is impossible. The capacitive fingerprint recognition circuit integrates SPI and I2C communication interfaces, has an external fingerprint sensor, and a built-in fingerprint processing MCU chip.

[0066] The entire system control process is as follows: Upon normal power-up, the system first establishes the connection between the first communication circuit and the fingerprint recognition circuit, performing fingerprint operation via the SPI communication line. If a communication abnormality occurs, or if a new fingerprint module is detected, I2C communication will be initiated to verify whether the fingerprint sensor has been replaced, serving as a double communication confirmation. Under normal circumstances, after learning the fingerprint template, both SPI and I2C communication will be used for dual learning and confirmation. After learning and confirmation are completed, in normal working mode, data access is first performed via SPI communication.

[0067] The second communication circuit and fingerprint recognition circuit will only be activated when an abnormality occurs in fingerprint learning and recognition. This circuit mainly plays an auxiliary role, which is usually referred to as the backup system circuit.

[0068] This application embodiment adds a backup communication line and a backup power system. Typically, poor contact in the transmission line or a broken cable in a single line causes the entire device to lose communication control with the fingerprint recognition circuit. Analyzing and optimizing the design from the perspective of communication circuit failure, a backup communication line is added to provide auxiliary power. In addition to the backup communication line, the power supply line has also been improved and optimized, adding a second backup power management system. The two power supplies operate independently, providing auxiliary power. Besides ensuring independent communication and power supply, different algorithms are used for the entire data encryption SPI and I2C processes.

[0069] The dual-communication fingerprint module and smart lock of this invention utilize a first communication circuit and a second communication circuit, with the second communication circuit serving as a backup circuit. This allows for emergency processing of fingerprint data. By employing the first and second communication circuits for data communication and encryption between the fingerprint recognition circuit and the main control MCU, and by enabling remote upgrades of the fingerprint recognition circuit, remote OTA upgrades can be performed when software bugs occur. This improves the user experience and solves the problems of single communication methods and easy data leakage in existing smart locks.

[0070] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fingerprint module with dual-channel communication, characterized in that, include: Fingerprint recognition circuit; First communication circuit; Second communication circuit; The first communication circuit is connected to both the main control MCU and the fingerprint recognition circuit, and is used for data communication and encryption between the fingerprint recognition circuit and the main control MCU, and for remotely upgrading the fingerprint recognition circuit. The second communication circuit is connected to both the main control MCU and the fingerprint recognition circuit. When the first communication circuit malfunctions, it completes data communication and encryption between the fingerprint recognition circuit and the main control MCU, and performs remote upgrades to the fingerprint recognition circuit.

2. The fingerprint module with dual-channel communication according to claim 1, characterized in that, The first communication circuit includes an SPI communication processing chip, and the second communication circuit includes an I2C communication processing chip.

3. The fingerprint module with dual-channel communication according to claim 2, characterized in that, The fingerprint recognition circuit includes: Capacitive sensor; Fingerprint processing chip; The capacitive sensor is electrically connected to the fingerprint processing chip.

4. The fingerprint module with dual-channel communication according to claim 3, characterized in that, The fingerprint recognition circuit also includes: Anti-interference circuit; The anti-interference circuit and the fingerprint processing chip are used to handle static electricity and voltage fluctuation interference.

5. The fingerprint module with dual-channel communication according to claim 4, characterized in that, The anti-interference circuit includes: Antistatic TVS tube; First capacitor; The first end of the anti-static TVS tube is connected to the first end of the first capacitor and then electrically connected to the fingerprint processing chip. The second end of the anti-static TVS tube and the second end of the first capacitor are respectively grounded.

6. The fingerprint module with dual-channel communication according to claim 5, characterized in that, The fingerprint recognition circuit also includes: First power supply processing circuit; The first power processing circuit is electrically connected to the fingerprint processing chip.

7. The fingerprint module with dual-channel communication according to claim 6, characterized in that, The fingerprint recognition circuit also includes: Second power supply processing circuit; The second power processing circuit is electrically connected to the fingerprint processing chip.

8. A smart door lock, comprising a dual-communication fingerprint module as described in any one of claims 1-7, characterized in that, Also includes: Main control MCU; The fingerprint recognition circuit, the first communication circuit, and the second communication circuit are electrically connected to the main control MCU.

9. The smart door lock according to claim 8, characterized in that, The smart lock also includes: System power supply circuit; The system power supply circuit is electrically connected to the first communication circuit and the fingerprint recognition circuit respectively, and is used to provide independent power to the first communication circuit and the fingerprint recognition circuit respectively.

10. The smart door lock according to claim 9, characterized in that, The system power supply circuit is also electrically connected to the second communication circuit and the fingerprint recognition circuit respectively, for independently supplying power to the second communication circuit and the fingerprint recognition circuit respectively.

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