RFID intelligent access control system

Abstract

The utility model discloses an RFID (Radio Frequency Identification) intelligent access control system which comprises a main control chip module, a distance and ambient light sensor module, an RFID module, a matrix keyboard key circuit module, an indicator light and backlight module and an RF (Radio Frequency) antenna. According to the utility model, two verification modes of RFID (radio frequency identification) and physical key input are adopted, the design is more humanized, the distance and light sensors are adopted, and through setting, the system can be awakened only when working is needed and can be kept in a sleep state in other time, so that the endurance time is greatly prolonged.

Description

Technical Field

[0001] The utility model relates to an intelligent access control system, in particular to an RFID intelligent access control system. Background Art

[0002] With the continuous increase in urbanization rate, high-rise buildings are densely packed in cities, and access control systems are installed at every door of each residential unit. In the early days, the access control system required visitors to press the room number on the access control system panel on the first floor, and then the user would answer the call and press the unlock button at home, and then the door on the first floor would be opened. Currently, the access control systems mainly include password access control systems, card access control systems, and biometric access control systems.

[0003] Password access control system, you only need to enter the password to open the door. The advantages are simple equipment, easy input, only need to remember the password, no other tools are required, and low cost. However, the disadvantages of this access control system are also obvious, especially its low security, the password is shared by the entire unit, and it is easy to leak. Therefore, this access control system has gradually been eliminated.

[0004] There are two main card swiping methods for access control systems: contact and contactless. The card swiping method uses a magnetic stripe card to identify and unlock. This contact card is easily damaged and demagnetized. The contactless method uses NFC (near field communication) to identify and unlock, which is more convenient. Moreover, many mobile phones now have NFC functions. You can copy the card to your mobile phone, and you only need to use the mobile phone to swipe the card for identification and unlocking.

[0005] Biometric access control systems mainly include fingerprint recognition, palm print recognition, face recognition, iris recognition, etc. The advantage of this access control recognition system is that it does not require any physical media such as cards, and it is highly secure, but this system is expensive and not suitable for general users. Therefore, the popularity of biometric access control systems is not high. Utility Model Content

[0006] The purpose of the utility model is to overcome the defects of the prior art and provide an RFID intelligent access control system, which adopts two verification methods: RFID (radio frequency identification) and physical button input. The design is more user-friendly, and uses distance and light sensors. It is set to wake up only when it needs to work and remain in sleep mode the rest of the time, which greatly increases the battery life.

[0007] The purpose of the utility model is achieved as follows: an RFID intelligent access control system, including a main control chip module, a distance and ambient light sensor module, an RFID radio frequency identification module, a matrix keyboard key circuit module, an indicator light and backlight module and an RF antenna;

[0008] The main control chip module is used to control the peripheral circuit through the I2C bus and collect data through the I / O port. The main control chip module has a built-in RF antenna to realize wireless transmission and reception of data;

[0009] The distance and ambient light sensor module is used to detect the intensity of ambient light and the distance of an object through infrared light. When the light becomes dim or a person or object approaches, the signal output of the sensor will change and transmit the signal to the main control module.

[0010] The RFID module is used to realize NFC card swipe recognition and card information writing. When the read information matches the system setting, the door can be opened;

[0011] The matrix keyboard button circuit module is used to generate a one-time random authorization password through the terminal user's mobile phone APP. After entering the key, the door can be opened. At the same time, it is also set with one-key locking, one-key sleeping and one-key SOS alarm functions;

[0012] The indicator light and backlight module are used to realize the display of different colors of LED lights or flashing of lights according to different working states of the system through system settings; when someone approaches at night, the backlight will light up, making it easier for users to see the buttons on the panel;

[0013] The main control chip module is electrically connected to the distance and ambient light sensor module, the RFID radio frequency identification module, the matrix keyboard key circuit module, and the indicator light and backlight module.

[0014] The utility model adopts the above technical solution, and compared with the prior art, the beneficial effects are as follows: the utility model adopts distance and light sensors, and by setting it to wake up only when it needs to work, and keep it in sleep mode for the rest of the time, it greatly increases the battery life; it adopts two verification methods, RFID (radio frequency identification) and physical key input, and can use NFC card to swipe the card, or it can be unlocked by generating a random authorization password, which solves the problem that people often forget to bring the card, and the design is more humane. The main control module integrates an RF communication module to realize Zigbee wireless communication. The power supply is powered by 4 AA dry batteries. Combined with the use of distance and ambient light sensors, it can be realized that when someone is within a distance of 5-10 cm, it will detect and enable the RFID (radio frequency identification) function, and light up the backlight at night, which is convenient for users to operate at night.

[0015] Furthermore, it also includes a power supply module, which is electrically connected to the main control chip module and is used to output a stable voltage to the main control chip module.

[0016] Furthermore, it also includes a buzzer, which is built into the main control chip module and is used to customize the output sound plan. When someone maliciously damages or opens the back cover of the system, an alarm is triggered and the buzzer makes a sound.

[0017] Furthermore, it also includes a burning interface circuit module, and the burning interface circuit module is used to provide a software burning interface for software programming.

[0018] In order to facilitate user operation and use, the matrix keyboard key module includes a matrix keyboard composed of sixteen touch switches, and the matrix keyboard includes ten numeric keys, the letter X, a lock key, a HOME key, a sleep key, an SOS key and an unlock key.

[0019] In order to facilitate user customization to suit the user's solution, the indicator light and backlight module includes a backlight composed of eight white LEDs and four LED indicator lights of different colors.

[0020] Furthermore, the RFID module uses the NXP RFID chip MFRC63003HN. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The principle block diagram of the utility model.

[0022] Figure 2 Circuit diagram of the power supply module of the utility model.

[0023] Figure 3 Circuit diagram of the main chip control module of the utility model.

[0024] Figure 4 Circuit diagram of the matrix keyboard key module of the utility model.

[0025] Figure 5 Circuit diagram of indicator light and backlight module of the utility model.

[0026] Figure 6 Circuit diagram of the RFID radio frequency identification module of the utility model.

[0027] Figure 7 Circuit diagram of the distance and ambient light sensor module of the utility model. DETAILED DESCRIPTION

[0028] like Figure 1 An RFID intelligent access control system shown includes a main control chip module, a distance and ambient light sensor module, an RFID radio frequency identification module, a matrix keyboard key circuit module, an indicator light and backlight module, an RF antenna, a buzzer, a power supply module and a burning interface circuit module;

[0029] The main control chip module is used to control the peripheral circuit through the I2C bus and collect data through the I / O port. The main control chip module has a built-in RF antenna to realize wireless transmission and reception of data;

[0030] The distance and ambient light sensor module is used to detect the intensity of ambient light and the distance of objects through infrared light. When the light becomes dim or a person or object approaches, the sensor's signal output will change and transmit the signal to the main control module;

[0031] The RFID module is used to realize NFC card recognition and card information writing. When the information read matches the system settings, the door can be opened. The RFID module uses NXP's MFRC63003HN radio frequency identification chip.

[0032] The matrix keyboard key circuit module is used to generate a one-time random authorization password through the terminal user's mobile phone APP. After entering the key, the door can be opened. At the same time, it is also set with one-key lock, one-key sleep and one-key SOS alarm functions; the matrix keyboard key module includes a matrix keyboard composed of sixteen touch switches. The matrix keyboard includes ten numeric keys, the letter X, a lock key, a HOME key, a sleep key, an SOS key and an unlock key;

[0033] The indicator light and backlight module is used to realize the display of different colors of LED lights or flashing of lights according to different working states of the system through system settings; the backlight will light up when someone approaches at night, making it easier for users to see the buttons on the panel; the indicator light and backlight module includes a backlight composed of eight white LEDs and four LED indicator lights of different colors;

[0034] The power supply module is used to output a stable voltage to the main control chip module;

[0035] The buzzer is built into the main control chip module and is used to customize the output sound scheme. When someone maliciously damages or opens the back cover of the system, an alarm is triggered and the buzzer sounds;

[0036] The burning interface circuit module is used to provide a software burning interface for software programming;

[0037] The main control chip module is electrically connected to the distance and ambient light sensor module, the RFID radio frequency identification module, the matrix keyboard key circuit module, the indicator light and backlight module, the power supply module and the burning interface circuit module.

[0038] like Figure 2As shown, a replaceable dry battery power supply solution is adopted. The battery slot can hold 4 AA-size dry batteries. This circuit mainly uses TI's power management chip TPS62840YBGR, which can convert the voltage range from 1.8V to 6.5V into a stable 3.3V voltage. The positive and negative electrodes of the battery are connected in parallel with two capacitors C1 and C2, and then connected to the resistor R1 and the C1 pin of the chip U1. The other end is connected in series with the resistor R3 and then connected to Figure 3 The 25th pin VBATT_SENSE of the main chip U4 shown is used to detect the battery voltage. When the battery voltage drops to the warning voltage, a low voltage warning signal will be issued-the red indicator light will flash. Resistor R4 and capacitor C6 form an RC filter network to reduce misjudgment caused by noise interference. The B2 pin of the chip U1 is a voltage output port, which is connected in series with the inductor L10 to obtain the VBUCK voltage, and then connected in series with the inductor L1 to obtain the 2.4V voltage signal VDD_ZB2.4; the C2 pin of the chip U1 is connected in series with the resistor R2 and then grounded. Capacitors C3, C4, C5 and C7 all play the role of power supply filtering and decoupling.

[0039] like Figure 3 As shown, the main control chip uses Silicon Labs' EFR32MG13P732F512GM48-DR microcontroller, which integrates Bluetooth, Thread and Zigbee wireless communication modules. It also integrates 512KB flash memory and 64KBRAM. It has a rich interface, the antenna output power can reach 19dBm, and the sensitivity of the received signal can reach -103.3dBm, so it can ensure the transmission of longer distance signals. The 1st, 2nd, 3rd, 6th, 7th and 12th pins of the main control chip U4 are burning interfaces, which are connected to the 2nd-7th pins of J1 respectively. The power supply pin of the 9th pin chip of the main control chip U4 is connected to the power supply V_DCDC network in series with the inductor L8 after passing through capacitors C37 and C38. Pins 10 and 11 are crystal oscillator drive interfaces. Connect the 38.4MHz quartz crystal oscillator Y2 to provide a stable clock signal to the main control chip U4. The 17th pin of the main control chip U4 is the RF antenna input and output interface. The filter network composed of inductor L5, capacitor C31, inductor L6, capacitor C32 and inductor L2 is connected to the antenna ANT1 on the PCB board. The 19th pin of the main control chip U4 is also the power input pin of the chip. The filter circuit composed of capacitor C28, capacitor C29, inductor L4 and capacitor C30 is connected to the V_DCDC network. The 7th, 8th, 19th, 20th, 21st, 22nd, 23rd and 24th pins of the main control chip U4 are Figure 4The row and column scanning interface of the matrix key shown in the figure has four rows and four columns with a total of sixteen keys; the 26th pin of the main control chip U4 is the backlight control pin, the 28th pin is connected in series with the resistor R27 and the key SW1 and then grounded, and the resistor R26 is a pull-up resistor connected to the power supply VBUCK; the 29th pin is the buzzer drive pin, which is connected in series with the resistor R8 to the base of the transistor Q1, and the emitter is grounded, and the resistor R9 is connected in parallel between the base and the emitter, and the collector of the transistor Q1 is connected in series with the buzzer BZ3 to the power supply VBUCK; the resistor R7 is connected in parallel between the two pins of the buzzer BZ3, and the 30th pin LED_MMIN is connected to Figure 5 The resistor R23 and D4 shown are connected to the yellow LED light. Pins 31, 32 and 48 are connected to Figure 5 The three LEDs shown are yellow, red and green; the 33rd pin TAMPER is connected in series with resistor R10 and switch SW2 and then grounded; resistor R11 is a pull-up resistor connected to the power supply VBUCK; SW2 is installed in the battery compartment of this product. When the battery is installed and the back cover is installed, this switch will be pressed down. When someone maliciously damages or opens the back cover, an alarm will be triggered, the buzzer will sound, the red LED will flash continuously and send the alarm information to the terminal or the user's mobile phone. The 34th pin is the power supply pin of the chip, connected to the magnetic bead FB1 and then connected to the VDD_ZB24 power supply; C26 and C27 are power supply filtering and decoupling capacitors. The 35th and 36th pins are another crystal oscillator input port of the chip, connected to a 32.768KH crystal oscillator Y1, mainly to provide accurate timing for the system; the 37th pin is the ground pin of the chip. The 38th pin is connected in series with the inductor L3 and then connected to the power supply V_DCDC, and C25 is a filter capacitor. Pin 39 is connected to power supply VDD_ZB24; C23 and C24 are power supply filtering and decoupling capacitors. Pins 40 and 41 are connected in series with capacitor C22, and capacitor C21 is then grounded. Pin 42 is connected to power supply VDD_ZB24, C19 and C20 are power supply filtering and decoupling capacitors; Pins 43-46 are RFID data and control interfaces, connected to Figure 6 The input end of the circuit shown in the figure; resistors R5 and R6 are pull-up resistors of the I2C bus communication line connected to the power supply VDD_ZB24; the 47th pin PROX_INT is the interrupt interface of the distance and ambient light sensor, connected to Figure 7 The input terminal of the circuit.

[0040] like Figure 4As shown, this circuit is a 4×4 matrix key circuit. KEY_ROW0 is connected in series with resistor R12 and connected to one end of keys SW3, SW4, SW5, and SW6 respectively; C8 is a filter capacitor, KEY_ROW1 is connected in series with resistor R13 and connected to one end of keys SW7, SW8, SW9, and SW10 respectively; C9 is a filter capacitor, KEY_ROW2 is connected in series with resistor R14 and connected to one end of keys SW11, SW12, SW13, and SW14 respectively; C10 is a filter capacitor, KEY_ROW3 is connected in series with resistor R15 and connected to one end of keys SW15, SW16, SW17, and SW18 respectively; C11 is a filter capacitor, KEY_COL0 is connected in series with resistor R16 and connected to one end of keys SW3, SW7, SW11, and SW15 respectively, and C12 is a filter capacitor. KEY_COL1 is connected in series with resistor R17 and connected to one end of keys SW4, SW8, SW12, and SW16 respectively. C13 is a filter capacitor, KEY_COL2 is connected in series with resistor R18 and then connected to one end of keys SW5, SW9, SW13 and SW17 respectively; C14 is a filter capacitor, KEY_COL3 is connected in series with resistor R19 and then connected to one end of keys SW6, SW10, SW14 and SW18 respectively, and C15 is a filter capacitor.

[0041] like Figure 5 As shown, the indicator light and backlight module includes four LEDs in three colors: red, yellow and green, which are used to display different states, such as alarm, normal entry, verification failure, malicious damage alarm, low voltage reminder, etc. The common anode method is adopted, and the power supply VBUCK is connected to the positive poles of LED lights D1, LED lights D2, LED lights D3, and LED lights D4, and then connected to the corresponding control pins of the main control chip U4 after being connected in series with current limiting resistors R20, R21, R22, and R23. D5-D12 is the LED near the matrix button as a backlight. When someone approaches at night to swipe the card or press the button, the backlight will light up, which is convenient for users to use this product in the dark night. R24-R33 are the current limiting resistors of D5-D12 respectively, the common end is connected to the drain D of MOSFET Q2, the source S is grounded, and the gate G is connected to the corresponding control pin of the main chip after being connected in series with resistor R35; the resistor R34 is connected in parallel between the gate G and the source S.

[0042] like Figure 6As shown, the RFID module uses the MFRC63003HN RFID chip produced by NXP, which supports the read / write mode of ISO / IEC 14443A and MIFARE Classic, and supports the read / write mode of NTAG; the 1st to 6th, 23rd, and 24th pins of the chip lead out test points TP3-TP8, TP1, and TP2, which are used for software burning and debugging of the chip; the 7th pin is connected in series with capacitor C18 to ground; the 8th, 18th, and 25th pins are the power supply pins of the chip connected to the VBUCK power supply; the 9th pin is connected in series with capacitor C33 to ground, the 12th pin is connected in series with capacitor C44 and resistor R46 and then connected to one end of inductor L9, the 13th pin is connected in series with capacitor C39 and resistor R43 and then connected to one end of inductor L7. The 14th pin is connected in series with capacitor C40 to ground. Resistor R42 is connected in parallel between pins 13 and 14. Pins 15 and 17 are two pins of the RFID coil. The filter network composed of inductor L7, inductor L9, capacitor C34, capacitor C35, capacitor C41, capacitor C42, capacitor C43, capacitor C45, resistor R44 and resistor R47 is connected to the two taps of the coil of the RFID antenna; resistor R45 is connected in parallel between pins 12 and 14, and pin 16 is grounded; pins 19 and 20 are the crystal oscillator interface of the chip, using a 27.12MHz crystal oscillator, which can just make the RFID frequency 13.56MHz, the international standard, after frequency division by 2. Pins 21, 29, 31, and 32 are the communication and control interfaces between the chip and the main control chip U4, and Figure 3 The corresponding pins of the main control chip U4 are shown as connected. R36 and R41 are pull-up resistors connected to the VBUCK power supply. Pins 27, 28, and 30 are connected to resistors R40, R37, and R38 respectively and then grounded, making the chip's I / O at a low level.

[0043] like Figure 7 As shown, the distance and ambient light sensor module circuit uses the SFH7776 ambient light and distance sensor produced by OSRAM. The maximum distance can reach 16 cm. When someone is about to swipe a card or press a key to enter, the product will be triggered and wake up from sleep mode. If it is at night, the backlight of this product will be turned on. When there is light during the day, the backlight will be turned off to save battery power. The 1st and 4th pins of the sensor U5 are power input pins, and four capacitors C46, ​​C47, C48, and C49 are connected in parallel to the VBUCK power network. The 2nd and 8th pins are the SCL and SDA signal lines of I2C communication, which are connected to the I2C bus of the main control chip U4; the 7th pin is the PROX_INT pin, which is connected to the 47th pin of the main control chip U4. When this sensor is triggered, the signal is transmitted to the main control chip U4, so that the program logic controls related functions, such as lighting the backlight, waking up or entering sleep mode, etc. The 5th and 6th pins are short-circuited, and the 3rd pin is the ground pin of this sensor.

[0044] The present utility model is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present utility model, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present utility model.

Claims

1. An RFID intelligent access control system, characterized in that: It includes main control chip module, distance and ambient light sensor module, RFID radio frequency identification module, matrix keyboard key circuit module, indicator light and backlight module and RF antenna; The main control chip module is used to control the peripheral circuit through the I2C bus and collect data through the I / O port. The main control chip module has a built-in RF antenna to realize wireless transmission and reception of data; The distance and ambient light sensor module is used to detect the intensity of ambient light and the distance of an object through infrared light. When the light becomes dim or a person or object approaches, the signal output of the sensor will change and transmit the signal to the main control module. The RFID module is used to realize NFC card swipe recognition and card information writing. When the read information matches the system setting, the door can be opened; The matrix keyboard button circuit module is used to generate a one-time random authorization password through the terminal user's mobile phone APP. After entering the key, the door can be opened. At the same time, it is also set with one-key locking, one-key sleeping and one-key SOS alarm functions; The indicator light and backlight module are used to realize the display of different colors of LED lights or flashing of lights according to different working states of the system through system settings; when someone approaches at night, the backlight will light up, making it easier for users to see the buttons on the panel; The main control chip module is electrically connected to the distance and ambient light sensor module, the RFID radio frequency identification module, the matrix keyboard key circuit module, and the indicator light and backlight module.

2. The RFID intelligent access control system according to claim 1, characterized in that: It also includes a power supply module, which is electrically connected to the main control chip module and is used to output a stable voltage to the main control chip module.

3. The RFID intelligent access control system according to claim 1, characterized in that: It also includes a buzzer, which is built into the main control chip module and is used to customize the output sound plan. When someone maliciously damages or opens the back cover of the system, an alarm is triggered and the buzzer makes a sound.

4. The RFID intelligent access control system according to claim 1, characterized in that: It also includes a burning interface circuit module, which is used to provide a software burning interface for software programming.

5. The RFID intelligent access control system according to claim 1, characterized in that: The matrix keyboard key module includes a matrix keyboard composed of sixteen light touch switches, and the matrix keyboard includes ten numeric keys, the letter X, a lock key, a HOME key, a sleep key, an SOS key and an unlock key.

6. The RFID intelligent access control system according to claim 1, characterized in that: The indicator light and backlight module includes a backlight composed of eight white LEDs and four LED indicator lights of different colors.

7. The RFID intelligent access control system according to claim 1, characterized in that: The RFID radio frequency identification module adopts the radio frequency identification chip MFRC63003HN of NXP.

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