Intelligent door lock based on WIFI communication ultra-low power consumption wireless networking

Abstract

The utility model discloses an intelligent door lock based on WIFI communication ultra-low power consumption wireless networking, which comprises an intelligent door lock, the intelligent door lock comprises an M0 core processor, an RAM module, a FLASH module, a card reading module, a motor module, an M4 core SOC, a WIFI radio frequency module and a power supply module, the M0 core processor is connected with the M4 core SOC through a full duplex serial port, and the M0 core processor is connected with the M4 core SOC through a full duplex serial port. The M0 core processor is respectively in communication connection with the card reading module, the motor module, the RAM module and the FLASH module, the M4 core SOC is in communication connection with the WIFI radio frequency module, the WIFI radio frequency module is connected with an antenna, a sender firstly sends a byte data 00 to wake up the processor of the opposite side and then sends protocol data, the two parties are in a working state at the moment, and if no data is transmitted and received within one second, the M0 core processor is in communication connection with the M4 core SOC. The M0 core processor and the M4 core SOC enter the dormant state, and the method can enable the M0 core processor and the M4 core SOC to be in the dormant mode with very low power consumption at ordinary times, meanwhile, the requirement of real-time communication is met, and the practicability of equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of smart door lock technology, and in particular to a smart door lock based on WIFI communication with ultra-low power wireless networking. Background Technology

[0002] WiFi communication technology has been widely used in smart locks. Existing locks generally employ two methods: One method involves keeping the WiFi module powered off during normal operation and activating it only when communication is needed. This reduces battery consumption, but it cannot receive data in real-time, consumes significant power during WiFi operation, and cannot be frequently activated to receive data. The other method uses a high-capacity lithium battery for power. In this case, the WiFi module can receive data in real-time, but it consumes more power, often requiring charging only once every four months of standby. This method has a shorter standby time, causing significant inconvenience for users and management in scenarios like offices, and is less practical. Utility Model Content

[0003] The purpose of this invention is to provide a smart door lock based on WIFI communication with ultra-low power wireless networking, so as to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a smart door lock based on ultra-low power wireless networking via WIFI communication, comprising a smart door lock, wherein the smart door lock includes an M0 core processor, a RAM module, a FLASH module, a card reader module, a motor module, an M4 core SOC, a WIFI radio frequency module, and a power supply module. The M0 core processor and the M4 core SOC are connected via a full-duplex serial port. The M0 core processor is communicatively connected to the card reader module, the motor module, the RAM module, and the FLASH module, respectively. The M4 core SOC is communicatively connected to the WIFI radio frequency module, and the WIFI radio frequency module is equipped with an antenna.

[0005] Preferably, the M0 core processor is used to handle the normal operation of the smart lock, and the M4 core SOC is used to handle the driving and communication of WIFI.

[0006] Preferably, the card reader module is used for data interaction with the MF1 card;

[0007] The motor module is used to drive the smart door lock switch;

[0008] The WIFI radio frequency module interacts with the wireless AP via an antenna, and then interacts with the server via the wireless AP.

[0009] Preferably, the WIFI RF module and antenna operate in the 2.4G ISM band, the WIFI supports the IEEE 802.11b / g / n protocol, the frequency band supports 20MHz and 40MHz bandwidth, and the WIFI transmission power is 0~20dBm.

[0010] As a preferred option, both the M0 core processor and the M4 core SOC are periodically woken up, with a periodic wake-up time of 100~500 milliseconds.

[0011] Preferably, the transmission power of the WIFI radio frequency module is adaptively adjusted according to the signal strength of the receiving wireless router. When the signal strength is below -69dBm, high-power wireless transmission is used, and when it is above -69dBm, +9dBm transmission power is used for wireless transmission.

[0012] Preferably, the power module is an AA dry cell battery or a lithium battery, used to power the smart door lock.

[0013] The beneficial effects of this utility model are:

[0014] 1. The sender first sends a byte of data 00 to wake up the other party's processor, and then sends protocol data. At this time, both parties are in working state. If there is no data transmission or reception within 1 second, both the M0 core processor and the M4 core SOC enter sleep state. This method allows both parties to be in a very low-power sleep mode during normal operation, while meeting the requirements of real-time communication and improving the practicality of the device.

[0015] 2. By adjusting the DTIM setting to 500 milliseconds, you can ensure network communication quality while optimizing the device's battery life, extending its standby time, avoiding frequent battery replacements, and improving the device's convenience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the communication connections between the modules in an embodiment of this utility model;

[0017] Figure 2 This is a flowchart illustrating the serial communication between two processors in an embodiment of this utility model.

[0018] Figure 3 This is a schematic diagram of the WIFI data transmission interval in an embodiment of this utility model.

[0019] In the diagram: 1. M0 core processor; 2. RAM module; 3. FLASH module; 4. Card reader module; 5. Motor module; 6. M4 core SOC; 7. WIFI radio frequency module; 8. Power supply module; 9. Antenna; 10. Wireless AP; 11. Server. Detailed Implementation

[0020] 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 embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-3 This utility model provides a smart door lock based on ultra-low power wireless networking via WIFI communication. The smart door lock includes an M0 core processor, a RAM module, a FLASH module, a card reader module, a motor module, an M4 core SOC, a WIFI radio frequency module, an antenna, and a power supply module. The M0 core processor and the M4 core SOC are connected via a full-duplex serial port. The M0 core processor is connected to the RAM module, the FLASH module, the card reader module, and the motor module. The M4 core SOC is connected to the WIFI radio frequency module, and the WIFI radio frequency module is connected to the antenna.

[0022] Specifically, the card reader module is used for data interaction with the MF1 card; the motor module is used for driving the motor to rotate in both directions to achieve the opening and closing of the door; the WIFI radio frequency module interacts with the wireless AP through the antenna, and the wireless AP interacts with the central server.

[0023] Specifically, the RF module and antenna operate in the 2.4G ISM band, the WIFI supports the IEEE 802.11b / g / n protocol, the frequency band supports 20MHz and 40MHz bandwidth, and the RF module and antenna can also operate in the WIFI 5G Band1, Band2 and Band3 frequency bands, using the 802.11ac protocol.

[0024] Specifically, the M0 core processor is responsible for handling the normal operation of the lock, including adding, deleting, modifying and retrieving access permissions, motor driving, card reader driving, business layer protocol processing and serial communication of the M4 core SOC; the M4 core SOC is used for WIFI driving and communication. This core has a working frequency of up to 160MHz and runs faster, but its power consumption is higher than that of the M0 core. Therefore, the normal operation of the door lock is handled by the M0 core, while the M4 core SOC is responsible for handling the faster WIFI.

[0025] Specifically, to reduce the power consumption of the smart lock, both the M0 core processor and the M4 core SOC wake up periodically every 500 milliseconds and then quickly enter sleep mode. In sleep mode, the total power consumption of the M0 core processor and the M4 core SOC is less than 20 microamps. The serial communication method between the M0 core processor and the M4 core SOC is as follows: Figure 2As shown, the sender first sends a byte of data 00 to wake up the other party's processor, and then sends protocol data. At this time, both parties are in working state. If there is no data transmission or reception within 1 second, both the M0 core processor and the M4 core SOC enter sleep state. This method allows both parties to be in a very low-power sleep mode during normal operation, while still meeting the requirements of real-time communication and improving the practicality of the device.

[0026] Specifically, the maximum transmission power of WIFI is +20dBm, and the minimum can be set to 0dBm. The current consumption varies greatly depending on the transmission power, as shown in Table 1. Table 1 shows the current consumption of several different transmission powers, and the receiving current is around 30mA.

[0027]

[0028] As shown in Table 1, changing the normal Wi-Fi transmission power by 20dBm will significantly reduce current consumption. A Wi-Fi signal strength of -80dBm is generally sufficient for normal communication; lower signal strengths can lead to communication problems. Therefore, when the signal strength is below -69dBm, a high-power wireless transmission is used; when it is above -69dBm, a +9dBm transmission power is used. At a +9dBm transmission power, the unobstructed line-of-sight Wi-Fi communication distance can reach 50 meters, which meets the needs of office and dormitory environments.

[0029] Specifically, DTIM frequency refers to the data transmission interval in Wi-Fi, used to control how long a Wi-Fi device should remain active after receiving data. By adjusting the DTIM setting, network communication quality can be ensured while optimizing device battery life. Typically, for devices not particularly sensitive to power consumption, this parameter is set to 100 milliseconds. This embodiment requires a battery standby time of over one year, so considering the transmit power setting at +9dBm, the DTIM time is set to 500 milliseconds. Figure 3 As shown, the measured average power consumption is around 140 microamps.

[0030] Specifically, because the entire system is designed for ultra-low power consumption, the door lock can be powered by dry cell batteries or lithium batteries. In this embodiment, a 5000 mAh lithium battery with a nominal voltage of 3.7V is used for power supply. The standby current is mainly composed of Table 2:

[0031]

[0032] From Table 2, the total standby current is 140 + 20 + 20 + 20 = 200 microamps, which is equivalent to the current consumed in one year:

[0033] 200*24*365 / 1000=1752mah

[0034] The door lock is calculated based on 10 openings per day, including card reading, motor rotation, record uploading, and temporary data transmission. This part consumes about 800 mAh per year, which is a total of 2552 mAh per year. Using lithium batteries is more than enough to meet the battery's lifespan.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements 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 smart door lock based on WIFI communication with ultra-low power wireless networking, comprising a smart door lock, characterized in that; The smart door lock includes an M0 core processor, a RAM module, a FLASH module, a card reader module, a motor module, an M4 core SOC, a WIFI radio frequency module, and a power module. The M0 core processor and the M4 core SOC are connected via a full-duplex serial port. The M0 core processor is communicatively connected to the card reader module, the motor module, the RAM module, and the FLASH module, respectively. The M4 core SOC is communicatively connected to the WIFI radio frequency module, and the WIFI radio frequency module is equipped with an antenna.

2. The smart door lock based on WIFI communication and ultra-low power wireless networking according to claim 1, characterized in that; The M0 core processor is used to handle the normal operation of the smart lock, and the M4 core SOC is used to handle the WIFI driving and communication.

3. The smart door lock based on WIFI communication and ultra-low power wireless networking according to claim 1, characterized in that; The card reader module is used for data interaction with the MF1 card; The motor module is used to drive the smart door lock switch; The WIFI radio frequency module interacts with the wireless AP via an antenna, and then interacts with the server via the wireless AP.

4. The smart door lock based on WIFI communication and ultra-low power wireless networking according to claim 1, characterized in that; The WIFI RF module and antenna operate in the 2.4G ISM band. The WIFI supports the IEEE 802.11b / g / n protocol, and the frequency band supports 20MHz and 40MHz bandwidth. The WIFI transmission power is 0~20dBm.

5. A smart door lock based on WIFI communication and ultra-low power wireless networking according to claim 1, characterized in that; Both the M0 core processor and the M4 core SoC are subject to periodic wake-up, with a wake-up time of 100~500 milliseconds.

6. The smart door lock based on WIFI communication and ultra-low power wireless networking according to claim 1, characterized in that; The transmission power of the WIFI radio frequency module is adaptively adjusted according to the signal strength of the receiving wireless router. When the signal strength is below -69dBm, it uses high-power wireless transmission, and when it is above -69dBm, it uses +9dBm transmission power for wireless transmission.

7. A smart door lock based on WIFI communication and ultra-low power wireless networking according to claim 1, characterized in that; The power module is a No. 5 dry cell battery or a lithium battery, used to power the smart door lock.

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