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Ten Questions And Ten Answers About Smart Lock Product Knowledge

Mar 16, 2021

1. What is a smart door lock?

A: The smart door lock is an improvement on the basis of traditional mechanical locks. It is a safe, convenient and advanced composite lock, which mainly adopts password recognition technology, fingerprint recognition technology, finger vein recognition technology, and face recognition. Technology, IC card, Bluetooth module and other technologies, support the Internet of Things function, and connect to the local area network and the Internet. There are many applications for smart door locks: banks, government departments (focusing on safety), hotels, school dormitories, residential quarters, villas, hotels (focusing on convenient management), etc.


2. What unlocking methods are available for current smart locks?

A: Currently, smart locks on the market generally have the following unlocking methods:

Biometric identification unlocking: fingerprint, face recognition, finger vein, palm vein, iris;

Bluetooth: mobile phone Bluetooth unlock, Bluetooth button unlock;

Traditional way: Unlock by spare mechanical key

Other methods: password unlock, NFC card unlock, mobile phone unlock, remote unlock, temporary password unlock

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3. Why should a spare keyhole be reserved for a safe and convenient smart lock?

A: The state stipulates that smart locks must have an emergency unlocking function: you can use special devices specially made by the manufacturer to take special methods for emergency unlocking; when the mechanical lock is used for emergency opening, the mechanical lock should meet the requirements of GA/T73-1994 A level . There are currently three types of emergency unlocking methods for smart door locks on the market, namely mechanical key unlocking, dual-circuit drive, and password turntable unlocking. Most of them use spare keys as emergency solutions.


Generally, the mechanical keyhole design of smart locks is relatively concealed, and it is not the main unlocking method, but an emergency backup, which is to prevent circuit failure, fire and other emergencies to play a key role.


4. What is optical fingerprint recognition and semiconductor fingerprint recognition?

A: Put your finger on the optical lens and project it on the charge coupled device (CCD) with a prism under the illumination of the built-in light source, and then form the ridges (the lines with a certain width and direction in the fingerprint image) which are black The valley line (the concave part between the lines) is a white digitalized multi-gray fingerprint image that can be processed by the fingerprint device algorithm. This is the optical fingerprint technology.

Advantages: It is widely used, adapts to temperature variation to a certain extent, and the price is relatively low.

Disadvantages: The optical fingerprint head is relatively large, and the recognition rate of fingers that are too dry and too greasy will be lower.


Semiconductor fingerprint recognition is divided into capacitive and inductive types. The principles of the two are similar. On a "plate" of thousands of semiconductor devices, a finger is attached to it to form the other side of the capacitor (inductance). Because the surface of the finger is convex and concave Unevenness, the actual distance between the convex point and the concave point to touch the plate is different, and the capacitance (inductance) value formed is different. According to this principle, the device collects the different values collected to complete the fingerprint collection.

Advantages: closer to living body recognition, very high sensitivity and recognition accuracy, low power consumption, and smaller fingerprint head.

Disadvantages: relatively high cost and difficult to maintain.

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6. What is finger vein recognition?

A: Finger veins are venous blood vessels distributed inside human fingers. The basic principle of vein recognition is to use the structure of veins to perform identity recognition. Through the near-infrared light irradiation, the CCD camera is used to obtain the image of the finger vein, the digital image of the finger vein is stored in the computer system, and the characteristic value is stored. Due to the application of the scene, finger vein recognition is generally used in home security (the palm vein recognition module is too large, and the recognition speed is reduced due to the larger area, which saves more vein information), which is convenient for lock design and faster recognition.


7. What is a mechanical lock body and an electronic lock body?

A: The lock body of the smart lock can be divided into mechanical lock body and electronic lock body according to whether there is an electronic part. Mechanical lock body. The lock body has no electronic parts, it is a simple mechanical structure, and it is no different from an ordinary mechanical lock body. For such lock bodies, manufacturers often adopt a through-hole design for the convenience of production and installation.


The mechanical intelligence integrated lock body is a lock body that combines intelligence and machinery. The most notable feature is that it drags a small tail (data cable) and needs to be connected to the inner panel. The working principle of this lock body is to achieve the purpose of opening the door by controlling whether the internal mechanism of the lock body is combined with the square shaft through an intelligent system. In other words, this lock body is designed with two square shafts inside and outside, and the two square shafts inside and outside are combined with the handle. The user needs to control the square shaft and the lock body to open the door, so you can open the door without proper authorization. No matter how you rotate the square shaft outside the door, the door will not open.


8. What are the communication methods for smart door locks? feature is?

A: The more commonly used network protocols are WiFi, Bluetooth, ZigBee, Z-Wave, etc.


WiFi power consumption is relatively large, suitable for transmitting a large amount of data; Bluetooth power consumption is relatively low; ZigBee technology is more complicated, and the research and development cost is high; Z-Wave is dominated by the Danish company Zensys, and is not as powerful as the ZigBee alliance for the time being.


There is also an emerging smart door lock communication protocol, namely NB-IoT. Compared with ordinary smart door locks, NB-IoT smart door locks have longer standby time, no gateway, better network stability and a more complete security environment. Perhaps, in the future, it will become a major direction in the field of smart door locks and even smart homes.


Of course, all wireless protocols have their advantages and disadvantages, but the most important selection factors are still interoperability and security, as well as more product choices.

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9. How do I know if my door can be locked?

A: There are many kinds of lock body specifications for door locks, and smart locks will also be designed in consideration of most of the lock body specifications on the market. In general, smart locks can be installed without changing the door, except for a few special or foreign locks. However, it can also be installed by modifying the hole on the door. If you want to install a smart lock, you can communicate with the merchant, and the merchant and the installer will help you solve it. In terms of materials, smart locks can be installed on wooden doors, iron doors, copper doors, composite doors and anti-theft doors. Smart locks can even be used on company glass doors.


10. What is the best maintenance method for smart door locks?

During the use of the smart lock, you must pay attention to product maintenance. There are many precautions, such as: prohibit unprofessional disassembly; do not force the door; wipe the collection window with a dry soft cloth to prevent scratches; keep away from water to prevent water ingress ; Keep away from corrosive substances; do not hang heavy objects on the door handle; when the spare key access switch is not sensitive, do not add lubricating oil to prevent dust from entering; check the lock regularly and replace the battery in time.


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