RU216510U1 - Access control device - Google Patents

Abstract

The utility model relates to automated access control devices in apartment buildings, designed to increase the level of public safety in apartment buildings and their surrounding areas. The access control device contains a processor unit located on the motherboard, connected to a power supply unit and an NFC tag reader unit. The processor unit is an ESP32 microprocessor module designed with a built-in Bluetooth unit and the ability to interact with an NFC tag reader unit, which contains a processor and an antenna, also installed on the board. The power support unit contains a synchronous DC-DC buck converter. The device contains capacitors configured to filter and smooth supply voltages and connected to a diode, which is connected to a linear voltage regulator connected to a switching output relay having two pairs of changeover contacts. In this case, the device contains connector J5, made with the possibility of in-circuit programming of the ESP32, as well as resistors R6 and R7, made with the possibility of pulling up programming circuits. The technical result of the utility model is to increase the efficiency of the access control device. 1 w.p. f-ly, 3 ill.

Description

The utility model relates to automated access control devices in apartment buildings, designed to increase the level of human interaction with the access control system via a smartphone, as well as public safety in apartment buildings and their surrounding areas.

The device is an element of a hardware-software combination for expanding the functionality of access control systems.

From the prior art, access control devices are known that have a processor and hardware, while having the disadvantage of low efficiency due to a non-optimal operation scheme, as well as the inability to use a smartphone as an identifier.

The task to which the utility model is directed is to optimize the access control device control scheme with the provision of such access using a smartphone.

When performing this task, the technical result of the utility model is achieved, which consists in increasing the efficiency of the access control device.

The technical result is achieved by an access control device containing a processor unit located on the motherboard, connected to a power supply unit, an NFC tag reader unit, while, according to the utility model, the processor unit is an ESP32 microprocessor module made with an integrated Bluetooth unit and the ability to interact with the unit NFC tag reader, which contains a processor and an antenna, also installed on the board, and the power support unit contains a synchronous DC-DC buck converter, while the device contains capacitors configured to filter and smooth the supply voltages, and connected to a diode, which is connected to a linear voltage regulator connected to a switching output relay having two pairs of changeover contacts, while the device contains a connector J5, made with the possibility of in-circuit programming of the ESP32, as well as resistors R6 and R7, made with the possibility of pulling up circuits programming.

The device can be made on a double-sided printed circuit board measuring 53 mm by 50 mm, the arrangement of parts is one-sided.

An exemplary embodiment of the utility model is shown in FIG. 1-3.

The device is connected to the entrance groups of access control systems. The simplest control interface is used - dry relay contacts.

The device has a block for reading NFC tags generated by smartphones or compatible products based on the Android OS; bluetooth block built into the ESP32 as a server for receiving data via the channels of this technology from smartphones or compatible devices based on Android and IOS OS.

In addition, there is a web interface for serializing the Device parameters, fine-tuning the operation parameters and receiving operation logs.

After receiving data from a smartphone via NFC or Bluetooth channels, the Device analyzes the data, decides to close the relay contacts to activate access, and writes information about the event to the internal memory.

The central processing unit of the Device (CPU1) is an ESP32 microprocessor module, for example, manufactured by Expressif.

Microprocessor module parameters:

- Embedded processor : Xtensa Dual-Core 32-bit LX6, 160 MHz or 240 MHz (up to 600 DMIPS)

- Built-in memory: 520 KB SRAM, 448 KB ROM

- Built-in program memory: 8 MB FLASH

- Hardware interfaces:

- 12-bit SAR ADC up to 18 channels

- 2 x 8-bit DACs

- 10 × touch sensors

- Temperature sensor

- 4 × SPI (one involved)

- 2 x I²S

- 2×I²C

- 3 × UART (one is used for debugging and initial loading of the program)

- 1 host (SD/eMMC/SDIO)

- 1 slave (SDIO/SPI)

- Ethernet MAC with DMA and IEEE 1588 support (enabled)

- CAN 2.0

- IR (TX/RX)

- Motor PWM

- LED PWM up to 16 channels

- hall sensor

- Ultra low power analog pre-amplifier

- Supply voltage from 2.9 volts to 3.7 volts

- Consumption current

- WIFI average 260 mA, maximum up to 0.5 A

- Bluetooth average 260 mA, maximum up to 0.5 A

- Built-in combined WIFI/Bluetooth antenna

- Dimensions: 19.4 × 26 mm

NFC interface support module (M1).

NFC module parameters:

Main processor NXP PN532

Operating frequency 13.56 MHz

Protocols:

ISO 14443 Type A - NXP Mifare 1k, 4k, Ultralight, Desfire

ISO 14443 Type B

ISO/IEC 14443-4 compliant chips

Felica

Jewel

TopaZ

Logic: CMOS, 3.3 V

Supply voltage: 3.3-5 V

Maximum current consumption: 150mA

Current consumption in standby mode: 100 mA

Current consumption in read mode: 120 mA

Current consumption in recording mode: 120 mA

Current consumption in pumping mode up to 1 A

Antenna: built-in, on board

Dimensions: 42.7 × 40.4 mm

The power support unit can be designed based on the MP2307DN (U1), a high performance, high efficiency synchronous step-down (STEP-DOWN) DC-DC converter.

Converter parameters:

Input voltage +5 to +26 volts

Maximum current 3 Amperes

Operating temperature range -40…+85°С

Made in a full (not abbreviated) scheme in accordance with the technical documentation from the manufacturer for this chip. The output voltage is 3.3 volts, set by resistors R1 + R5. Choke L1 is designed for a current of at least 3 amperes. Diode D2 - Schottky, to improve the generation parameters (acceleration of start-up, stabilization of parameters at high load currents). Diode D3 - Schottky, used as a filter for sudden changes in the load current, stabilizes the operation of the converter in extreme conditions.

The power support unit provides the ESP32 processor module and the NFC module. Capacitors C1, C2, C6, C7, C8 - filtering and smoothing supply voltages.

Diode D1 protects the Device from a power supply polarity connection error.

U3 linear voltage regulator provides +5 volts power to the switching output relay RL1. The relay has two pairs of changeover contacts rated for 2A/250VAC. The relay is controlled via U2, a Darlington transistor assembly - ULN2003.

Module M1, connected to CPU1 via SPI interface.

J1 - output block for power supply and relay output contacts.

Connector J5 is for in-circuit programming of the ESP32. Resistors R6 and R7 provide pull-ups for the necessary programming circuits for the correct mode of operation of CPU1.

The device is made on a double-sided printed circuit board measuring 53 mm by 50 mm. The location of the parts is one-sided.

Local software of the Device.

The firmware of the device contains the following program modules:

Module for receiving data via NFC. Designed to receive information via an NFC short-range communication channel from a smartphone or its equivalent (hereinafter referred to as the "Client Device" or CU).

Module for receiving data via Bluetooth. Designed to receive information via a medium-range communication channel from a smartphone or its equivalent (hereinafter referred to as the “Client Device” or CU).

Bluetooth Broadcast Module notifies surrounding potential customers of available services. Participates in the procedure for identifying KU friend or foe.

The module for controlling the range of finding Bluetooth clients determines the conditional range of finding the KU.

The module for maintaining a list of active Bluetooth clients controls active users, their maintenance and / or disconnection.

The relay control module processes the relay operation requests from other modules and controls the relay according to the settings.

WIFI hotspot support module, provide user connection for administration.

The module for supporting the device's web administration server controls the authorization of access to administration, allows you to configure settings, test relay operation, replace software, and download operation logs.

Data storage organization module in non-volatile memory and access to them. Allocates non-volatile memory between fine-tuning data and logs, allows other modules to access and modify this data.

The module for maintaining a user database with related parameters allows other modules to obtain data on previous connections of the KU with the corresponding parameters.

The device firmware replacement module controls the integrity and validity of the firmware and its version.

Module for controlling the current date and time. Since the Device does not have a real time clock, the module restores the current date and time using the accumulated data from previous CU connections.

Data decryption and control module. Decrypts received data. Checks their correctness, decides on the validity of the key.

The module for obtaining the firmware and its application on the device.

Module for logging permissions and prohibitions of relay operations.

Authorization password generation and control module.

The starting module prepares the operational data of the device, checks the NFC performance, loads data from non-volatile memory, and writes the fact of launch to the log.

The proposed design scheme of the access control device eliminates the shortcomings of the existing state of the art, allowing to achieve a technical result, which consists in increasing the efficiency of the access control device, since the distinctive features of the utility model formula make it possible to implement the optimal programming scheme for such a device.

A search through publicly available sources of information showed that the entire set of essential features of an access control device is not known from the prior art, and therefore the utility model meets the condition of patentability "novelty".

The access control device is manufactured from components standard for this field of technology on well-known equipment, that is, it can be used in industry, which is why the utility model meets the patentability condition "industrial applicability".

It should be understood that after considering the above description with examples of implementation of the proposed access control device by a specialist, other changes, modifications and embodiments of the utility model will become obvious to him. Thus, all such changes, modifications and implementation options, as well as other applications that do not differ from the essence of this utility model, should be considered protected by this utility model within the scope of the attached claims.

Claims (2)

1. An access control device containing a processor unit located on the motherboard, connected to a power supply unit and an NFC tag reader unit, characterized in that the processor unit is an ESP32 microprocessor module made with an integrated Bluetooth unit and the ability to interact with the NFC tag reader unit, which contains a processor and an antenna, also installed on the board, and the power support unit contains a synchronous DC-DC buck converter, while the device contains capacitors configured to filter and smooth the supply voltages and connected to a diode, which is connected to a linear voltage regulator connected to to a switching output relay having two pairs of changeover contacts, while the device contains a connector J5, made with the possibility of in-circuit programming of the ESP32, as well as resistors R6 and R7, made with the possibility of pulling up programming circuits. 2. The device according to claim 1, characterized in that it is made on a double-sided printed circuit board measuring 53 mm by 50 mm, the arrangement of parts is one-sided.

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