Access control device based on Internet of Things

Abstract

The utility model relates to an access control device based on Internet of Things, which comprises a logic master control circuit, an acquisition master control circuit, a camera module, a voice circuit, a fingerprint acquisition circuit, an NFC (near field communication) reading circuit and a millimeter wave radar circuit, the acquisition master control circuit is in communication connection with the voice circuit, the fingerprint acquisition circuit, the NFC reading circuit and the millimeter wave radar circuit. According to the utility model, the logic master control circuit and the acquisition master control circuit are arranged, the logic master control circuit receives data acquired by the acquisition master control circuit and carries out corresponding control, and an acquisition function and a control function are separated, so that the data processing amount is reduced, and the stability of the device is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the access control technology field of thing networking especially is involved in an access control device based on thing networking. BACKGROUND

[0002] With the rise of thing networking technology, access control systems begin to combine with thing networking technology. It realizes the monitoring and control of the access door through the sensor, controller, network communication and other components. Its working principle is to sense the opening and closing state of the door through the sensor, and to remotely control the opening and closing of the door through the controller, and to transmit the relevant data to the management platform, realizing the management and monitoring of the access door. By connecting the access control device to the cloud server, users can remotely control the access control through mobile phones or other terminal devices, view the access control status and historical records, but also bring new security problems. For example, network attacks may cause the access control system to be remotely controlled, data leakage may cause user information to be stolen, and the security of the cloud server directly affects the security of the access control system. The thing networking access control system relies on the cooperative work of the network and multiple devices. Once a fault or network interruption occurs, it may affect normal use. In addition, the maintenance of the system requires professional technical personnel and equipment, and the maintenance cost is high.

[0003] The utility model discloses a kind of housing access control equipment, including access control host, power supply, exit button and electric lock, the power supply is electrically connected with access control host, electric lock and exit button respectively;The access control host is equipped with control circuit, the identity recognition module for identifying identity information and the microwave radar sensing module for detecting mobile personnel and sending information, the control circuit is equipped with network switch, optical modem and the storage module for storing identity information, the control circuit is respectively connected with identity recognition module and microwave radar sensing module communication, the electric lock is electrically connected with the output end of control circuit;The patent does not show that the acquisition function and control function are separated.

[0004] Therefore, it is an urgent problem to improve a kind of device that acquisition function and control function are separated. Utility model content

[0005] The utility model discloses a kind of access control devices based on thing networking to overcome the defects existing in the prior art.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] According to one aspect of the utility model, provide a kind of access control device based on Internet of Things, including logic main control circuit, acquisition main control circuit, camera module, voice circuit, fingerprint acquisition circuit, NFC reading circuit and millimeter wave radar circuit, the logic main control circuit is connected with acquisition main control circuit and camera module communication respectively, the acquisition main control circuit is connected with voice circuit, fingerprint acquisition circuit, NFC reading circuit and millimeter wave radar circuit communication respectively.

[0008] As preferred technical solutions, the logic main control circuit and the acquisition main control circuit each include a main control chip, the main control chip includes an RXD0 port, a TXD0 port, and multiple IO ports, and the main control chips of the logic main control circuit and the acquisition main control circuit are communicatively connected through the IO ports.

[0009] As preferred technical solutions, the logic main control circuit and the camera module communicate through a UART protocol.

[0010] As preferred technical solutions, the voice circuit includes a voice control chip, an external microphone sub-circuit, and a speaker sub-circuit, and the voice control chip is communicatively connected with the external microphone sub-circuit and the speaker sub-circuit.

[0011] As preferred technical solutions, the voice control chip includes a PA2 port and a PA3 port, and the PA2 port and the PA3 port are connected with the RXD0 port and the TXD0 port of the main control chip, respectively.

[0012] As preferred technical solutions, the voice control chip includes a MICBIAS port, a MICP_L port, and a MICN_L port, the external microphone sub-circuit includes a MIC+ port and a MIC- port, and the MICBIAS port, the MICP_L port, and the MICN_L port are connected with the MIC+ port and the MIC- port, respectively.

[0013] As preferred technical solutions, the speaker sub-circuit includes an 8002A chip, the 8002S chip includes a VO1 port, a VO2 port, and an IN- port, the voice control chip further includes an HPOUT port, the HPOUT port is connected with the VO1 port and the IN- port, respectively, and the VO1 port and the VO2 port are led out as SPK+ and SPK- pins, respectively.

[0014] As preferred technical solutions, the fingerprint acquisition circuit includes a TX port and an RX port, and the TX port and the RX port are connected with the RXD0 port and the TXD0 port of the main control chip, respectively.

[0015] As a preferred technical scheme, the NFC reading circuit comprises an IC reading chip, the IC reading chip comprises an SDA port, an SCK port, an MOSI port, an MISO port and an RST port, the IO port comprises an IO15 port, an IO18 port, an IO23 port, an IO19 port and an IO4 port, and the SDA port, the SCK port, the MOSI port, the MISO port and the RST port are sequentially connected with the IO15 port, the IO18 port, the IO23 port, the IO19 port and the IO4 port.

[0016] As a preferred technical scheme, the device further comprises a power supply circuit, which is connected with the logic master control circuit, the acquisition master control circuit, the camera module, the voice circuit, the fingerprint acquisition circuit, the NFC reading circuit and the millimeter wave radar circuit respectively, and the power supply circuit comprises a plurality of voltage stabilizers, and the voltage stabilizers are voltage stabilizers with model numbers of MP4462DN and ME6211C33M5G.

[0017] Compared with the prior art, the device has the following beneficial effects:

[0018] 1. The logic master control circuit and the acquisition master control circuit are arranged, the logic master control circuit receives data collected by the acquisition master control circuit, and corresponding control is performed, so that the acquisition function and the control function are separated, the data processing amount is reduced, and the stability of the device is improved.

[0019] 2. The camera module, the fingerprint acquisition circuit and the NFC reading circuit are arranged, the NFC identification technology, the face recognition technology and the fingerprint recognition technology are combined, and the device can realize triple selectable identity verification, and effectively prevent illegal intrusion.

[0020] 3. Three GPIO interfaces are used for interconnection between the master control chips, and data and control instructions are transmitted through specific signal combinations. Because there are many external devices in the system, the communication scheme can save a large number of external device interfaces, and does not need complex protocol processing and additional hardware support, and the power consumption is lower.

[0021] 4. The device adopts a high-integration type DC-DC step-down scheme, reduces the complexity and size of the circuit, and improves the overall performance. The design can accept a wide range of input voltages, and can flexibly provide different output voltage values. In addition, a peripheral power supply interface is specially led out, which not only meets the power supply requirements of multiple peripherals in the system, but also is convenient for subsequent flexible replacement or maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a connection schematic diagram of the device;

[0023] Figure 2 It is a logic master control circuit schematic diagram of the device;

[0024] Figure 3 This is a schematic diagram of the voice circuit chip of this utility model;

[0025] Figure 4 This is a schematic diagram of the microphone connection of this utility model;

[0026] Figure 5 This is a schematic diagram of the speaker connection of this utility model;

[0027] Figure 6 A schematic diagram of the fingerprint acquisition circuit of this utility model;

[0028] Figure 7 A schematic diagram of the NFC reading circuit of this utility model;

[0029] Figure 8 A schematic diagram of the power supply circuit of this utility model. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.

[0031] An Internet of Things (IoT) access control system includes:

[0032] The perception layer is primarily responsible for data acquisition and preliminary processing, serving as the interface between the system and the external environment. It includes a millimeter-wave radar module for detecting approaching personnel and door status; an NFC reader for reading card information; a fingerprint unlocking module for collecting and recognizing fingerprint data; a camera module for acquiring image data; an electromagnetic lock module for controlling door opening and closing; an Asrpro voice module for voice announcements, providing prompts based on system status; and an OLED display module for displaying access control status, laboratory information, and weather information.

[0033] The transmission layer is responsible for transmitting data collected by the perception layer to the control layer or the cloud, and also for transmitting control commands from the control layer or the cloud to the execution module. It also enables communication between the main controller and the camera module (Jetson Nano).

[0034] The control layer is the central hub of the access control system. It is responsible for processing the data collected by the sensing layer and issuing control commands based on the processing results. The ESP32 microcontroller serves as the main control chip, responsible for access control system control and communication; the Jetson Nano serves as the camera module.

[0035] Software development layer: The system uses ESP32 for embedded software development, realizing the functions of access control system control, communication and data processing; the webpage interface is used for user login and control of the webpage interface of the access control system.

[0036] Cloud server layer: mainly responsible for the construction and maintenance of the cloud server, and communication and data storage with the host.

[0037] The workflow consists of standby and working states:

[0038] (1) In standby state, the system will reduce energy consumption, turn off or reduce the energy consumption of unnecessary functions, such as reducing the video pixel and frame number of the camera while maintaining key monitoring functions, conducting real-time video monitoring, ensuring continuous observation of the surrounding environment, which helps to quickly respond when there is an abnormal situation. The administrator can still access the access control system remotely through the network, view real-time video, check system status or make configuration modifications.

[0039] (2) Working state: first, the millimeter wave radar module in the perception layer detects whether there is personnel approaching, if so, it enters the working state and requires the user to select the identity verification method, there are three verification methods to choose from: NFC identification technology, face recognition technology and fingerprint recognition technology; then the system verifies the identity information, and if the verification is successful, the access is opened and the information is uploaded to the webpage, if the verification fails, the verification method needs to be selected again, if no personnel is detected, the process ends.

[0040] In terms of embedded development, the invention uses C language to write the underlying hardware driver and control logic to ensure the realization of device functions. The back-end development is mainly responsible for the logical processing and data management of the server side of the access control system, including user verification, permission setting, data storage and query functions. Front-end development focuses on the implementation of user interfaces, using HTML, CSS and JavaScript frameworks to create user login, permission management and data display interfaces. Administrators can perform user identity verification, remote door opening, view access records and real-time access status through these interfaces. In addition, the system records each access event in the document on the cloud server, for example, when someone enters or leaves, the system automatically records the occurrence time, the state of the door (such as opening or closing) and the identity information of the personnel. These information will be visualized on the webpage according to the principles of security, confidentiality and openness, providing users with multiple presentation forms.

[0041] The utility model provides a kind of access control device based on internet of things;The utility model is provided with logic main control circuit and acquisition main control circuit, logic main control circuit receives the data collected by acquisition main control circuit, and carries out corresponding control, separates acquisition function and control function, reduces the processing capacity of data, improves the stability of device.The utility model is provided with camera module, fingerprint acquisition circuit, NFC reading circuit, combined with NFC identification technology, face recognition technology and fingerprint identification technology, the present application can realize triple selectable identity authentication, effectively prevent illegal intrusion.The utility model is interconnected using three GPIO interfaces between main control chip, data and control instruction are transmitted by specific signal combination.Because the system has more peripherals, this communication scheme can save a large number of peripheral interfaces, and does not need complex protocol processing and additional hardware support, and power consumption is lower.The utility model adopts high-integration type DC-DC step-down scheme, reduces the complexity and volume of circuit, improves overall performance.This design can accept a wide range of input voltage, and can flexibly provide different output voltage values, in addition, especially lead peripheral power supply interface, meet the demand of power supply of multiple peripherals in the system, and facilitate subsequent flexible replacement or maintenance.

[0042] Embodiment 1

[0043] As Figures 1-8 shown, an access control device based on internet of things includes logic main control circuit, acquisition main control circuit, camera module, voice circuit, fingerprint acquisition circuit, NFC reading circuit and millimeter wave radar circuit, the logic main control circuit is connected with acquisition main control circuit and camera module in communication respectively, the acquisition main control circuit is connected with voice circuit, fingerprint acquisition circuit, NFC reading circuit and millimeter wave radar circuit in communication respectively.

[0044] In the embodiment, the device includes ASRPRO voice module, power module, RC522 NFC card reader, LD2420 millimeter wave radar and AS608 fingerprint module, each module includes a circuit that implements its function, the camera module and the logic main control are connected through jetson Nano, Jetson Nano is an artificial intelligence computer, mainly used for embedded applications and AIoT field.

[0045] The logic main control circuit and acquisition main control circuit both include main control chip, the main control chip includes RXD0 port, TXD0 port and multiple IO ports, the main control chip of logic main control circuit and acquisition main control circuit is connected in communication through IO port.

[0046] The logic main control circuit and camera module communicate through UART protocol.

[0047] In the embodiment, the master chip of the device is mainly composed of two ESP-WROOM32, which are logical master and collection master respectively. The two master chips are connected through three GPIOs, and the highest 8 signals are provided according to 3-bit binary to communicate. The logical master obtains weather through network, receives signals sent by the collection master, and outputs control signals and state signals of the door lock. The other one is the collection master, which collects the state of the millimeter wave radar sensor, the fingerprint collector and the NFC card reader and sends it to the logical master to execute operation. In addition, the collection master also carries ASRPRO as a voice broadcast module and completes the control of the serial screen. The architecture of the logical master and the collection master not only improves the scalability of the system, but also enhances the reliability of the system. Even if a module fails, it will not affect the core function of the whole system. Among them, the Jetson Nano and the logical master communicate through the UART protocol. UART is an asynchronous serial communication protocol, and each device has an RX pin and a TX pin (RX for receiving and TX for sending). The UART2 of the logical master is connected with the UART1 of the Jetson Nano.

[0048] The device takes Loongson ESP-WROOM-32 as the master chip, mainly composed of automatic download circuit, Type-C circuit, voltage stabilizing circuit, LED circuit, switch circuit and outgoing pins, among which 38 GPIO pins include two-way serial port, one-way I2C, one-way SPI, and multi-way PWM, ADC interface, etc.

[0049] The voice circuit includes a voice control chip, an external microphone sub-circuit and a loudspeaker sub-circuit, and the voice control chip is in communication connection with the external microphone sub-circuit and the loudspeaker sub-circuit respectively. The voice control chip includes PA2 port and PA3 port, and the PA2 port and the PA3 port are connected with the RXD0 port and the TXD0 port of the master chip respectively. The voice control chip includes MICBIAS port, MICP_L port and MICN_L port, the external microphone sub-circuit includes MIC+ port and MIC- port, and the MICBIAS port, the MICP_L port and the MICN_L port are connected with the MIC+ port and the MIC- port respectively.

[0050] The loudspeaker sub-circuit includes 8002A chip, and the 8002S chip includes VO1 port, VO2 port and IN- port. The voice control chip further includes HPOUT port, and the HPOUT port is connected with the VO1 port and the IN- port respectively, and the VO1 port and the VO2 port are led out as SPK+ pin and SPK- pin respectively.

[0051] In the embodiment, the voice control chip is TW-ASR-PRO chip, 5V power supply is required, the external microphone circuit and the speaker circuit are designed separately with digital ground and analog ground. The microphone circuit is connected to R3, R4 and R7 through a core pin MICBIAS, and is connected to MIC+ and MIC- through C8 and C9 100nF capacitors in the series circuit respectively; the speaker circuit selects 8002A chip and links the core through HPOUT, and SPK+ and SPK- pins are introduced. The ASRPRO voice module and the ESP32 logic main control perform data transmission through the UART communication protocol, and PA2 and PA3 in the ASRPRO voice module are connected to RXD0 and TXD0 of the ESP32 logic main control respectively.

[0052] The fingerprint collection circuit includes a TX port and an RX port, and the TX port and the RX port are connected with the RXD0 port and the TXD0 port of the main control chip respectively.

[0053] In the embodiment, data transmission is performed with the ESP32 collection main control through the UART protocol, and the TX and RX interfaces of the AS608 fingerprint module are connected to RXD0 and TXD0 of the collection main control respectively.

[0054] The NFC reading circuit includes an IC reading chip, the IC reading chip includes an SDA port, an SCK port, an MOSI port, an MISO port and an RST port, the IO port includes an IO15 port, an IO18 port, an IO23 port, an IO19 port and an IO4 port, and the SDA port, the SCK port, the MOSI port, the MISO port and the RST port are sequentially connected with the IO15 port, the IO18 port, the IO23 port, the IO19 port and the IO4 port.

[0055] In the embodiment, an RC522 NFC card reader is adopted: MF RC522 is a member of the high-integration read-write card series chip applied in 13.56MHz non-contact communication, which is a low-voltage, low-cost and small-size non-contact read-write card chip, and utilizes advanced modulation and demodulation concept, and completely integrates all types of passive non-contact communication modes and protocols under 13.56MHz.

[0056] Take MF522 as IC reading chip, use 3.3V power supply, and need 27.12M clock circuit, and lead out five interfaces in SPI. The main pin introduction of SPI interface: SCK pin is clock signal line, used for synchronous data transmission; MISO and MOSI are data lines of master device and slave device respectively; RST pin is used for resetting RC522; SDA is used for serial communication with microcontroller, wherein the SDA, SCK, MOSI, MISO and RST interfaces are connected to IO15, IO18, IO23, IO19 and IO4 of the collection master control respectively, so that the card is identified and read and written through the SPI communication mode.

[0057] The device also includes a power supply circuit connected with the logic master control circuit, the collection master control circuit, the camera module, the voice circuit, the fingerprint collection circuit, the NFC reading circuit and the millimeter wave radar circuit respectively, and the power supply circuit includes a plurality of voltage stabilizers. The voltage stabilizers are MP4462DN and ME6211C33M5G.

[0058] In the embodiment, the power supply circuit first receives an input power (24v) through a three-pin connector CN1, one pin of which is connected to the ground, and the other two pins are connected to the circuit respectively. The input power is protected and filtered by a filtering capacitor C1 and a transient voltage suppression diode D1, and then enters a voltage stabilizer U2 to convert the +24V voltage into a stable +5V output. At the same time, 5v is input into another conversion sub-circuit to convert 5v into 3.3v, and the input power is provided to other circuits or devices through a connector U3 to provide 24v voltage. At the same time, the connector U3 also contains an inductor R2 and a ground capacitor PGND for further power filtering and stabilization.

[0059] For the complexity of power management, the whole device meets the 12-36V wide voltage input standard, and the power supply interface is led out for the door lock module; in terms of microcontroller power supply, an industrial-grade DC-DC step-down module with MP4462DN as the controller is used to realize power output, and a magnetic bead is used to isolate the power ground plane and the digital ground plane to reduce the influence of power noise on the system. MP4462DN is a high-frequency step-down switching regulator with an integrated high-side field effect transistor switch, providing a maximum output of 3.5A and a current mode control function that adapts to fast loop response. In terms of 3.3V power supply, we use ME6211C33M5G to realize linear power output. ME6211C33M5G is a domestic LDO (linear voltage regulator) device with a maximum input of 6V and a rated output of 3.3V, with a ripple rejection ratio of up to 70dB, and is a LDO that can withstand engineering practice. This power supply design scheme not only meets the power supply requirements in different scenarios, but also ensures the efficiency and stability of power conversion.

[0060] The traditional power supply scheme usually adopts a simple LDO (linear voltage regulator), such as LM7805 voltage regulator, which has the disadvantages of low efficiency, high power consumption and low reliability when the input-output voltage difference is large.

[0061] The LD2420 millimeter wave radar is adopted, the LD2420 is a 2.4GHz radar induction module, a human body target in a set space is detected by using FMCW frequency modulation continuous wave, and high sensitivity human body movement / micro-motion induction is realized by combining radar signal processing and accurate human body induction algorithm. Configuration tools can be provided to modify the induction distance range, induction sensitivity and no one time delay and the like. In the project, whether there is a moving or micro-motion human body in the sensing area, the in-out state of the human body is realized, and the real-time output result is realized.

[0062] The device further comprises a serial port screen as a touch screen for information display, and the degree of customization is high, and the device is used as an information display platform outside the access control in the project.

[0063] The above merely illustrates the specific implementation of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, and these modifications or replacements should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An access control device based on the Internet of Things, characterized in that, It includes a logic main control circuit, an acquisition main control circuit, a camera module, a voice circuit, a fingerprint acquisition circuit, an NFC reading circuit, and a millimeter-wave radar circuit. The logic main control circuit is communicatively connected to the acquisition main control circuit and the camera module, and the acquisition main control circuit is communicatively connected to the voice circuit, the fingerprint acquisition circuit, the NFC reading circuit, and the millimeter-wave radar circuit.

2. The access control device based on the Internet of Things according to claim 1, characterized in that, Both the logic main control circuit and the acquisition main control circuit include a main control chip. The main control chip includes an RXD0 port, a TXD0 port, and multiple I / O ports. The main control chips of the logic main control circuit and the acquisition main control circuit are connected for communication through the I / O ports.

3. The access control device based on the Internet of Things according to claim 1, characterized in that, The logic control circuit and the camera module communicate via the UART protocol.

4. The Internet of Things-based access control device according to claim 1, characterized in that, The voice circuit includes a voice control chip, an external microphone sub-circuit, and a speaker sub-circuit, with the voice control chip communicatively connected to the external microphone sub-circuit and the speaker sub-circuit, respectively.

5. The Internet of Things-based access control device according to claim 4, characterized in that, The voice control chip includes a PA2 port and a PA3 port, which are connected to the RXD0 port and TXD0 port of the main control chip, respectively.

6. The Internet of Things-based access control device according to claim 4, characterized in that, The sound control chip includes a MICBIAS port, a MICPL port, and a MICNL port. The external microphone sub-circuit includes a MIC+ port and a MIC- port. The MICBIAS port, MICPL port, and MICNL port are respectively connected to the MIC+ port and the MIC- port.

7. The Internet of Things-based access control device according to claim 4, characterized in that, The speaker sub-circuit includes an 8002A chip, which includes a VO1 port, a VO2 port, and an IN- port. The sound control chip also includes an HPOUT port, which is connected to the VO1 port and the IN- port respectively. The SPK+ pin and the SPK- pin are brought out from the VO1 port and the VO2 port respectively.

8. The access control device based on the Internet of Things according to claim 2, characterized in that, The fingerprint acquisition circuit includes a TX port and an RX port, which are respectively connected to the main control chip, including an RXD0 port and a TXD0 port.

9. The Internet of Things-based access control device according to claim 2, characterized in that, The NFC reading circuit includes an IC reading chip, which includes an SDA port, an SCK port, a MOSI port, a MISO port, and an RST port. The IO ports include IO15, IO18, IO23, IO19, and IO4, and the SDA port, SCK port, MOSI port, MISO port, and RST port are IO15, IO18, IO23, IO19, and IO4 respectively.

10. The Internet of Things-based access control device according to claim 1, characterized in that, The device also includes a power supply circuit, which is connected to the logic main control circuit, the acquisition main control circuit, the camera module, the voice circuit, the fingerprint acquisition circuit, the NFC reading circuit, and the millimeter-wave radar circuit. The power supply circuit includes multiple voltage regulators, which are MP4462DN and ME6211C33M5G voltage regulators.

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