In the current era of rapid technological development, smart home products are entering people's lives at an unprecedented pace. As a crucial part of the smart home sector, smart door locks have gradually evolved from traditional mechanical locks into intelligent security devices integrating multiple advanced technologies, greatly transforming people's home experience. Among the many technologies that enhance the performance of smart door locks, the application of radar modules is gradually emerging, opening up a new path for the development of smart door locks.??

The Working Principle of Radar Modules??

Radar, as an electronic device that uses electromagnetic waves to detect targets, operates based on the emission and reception of electromagnetic waves. In the radar modules applied to smart door locks, electromagnetic waves of specific frequencies are typically emitted. These waves propagate in space and reflect when encountering objects, such as the human body. The radar module analyzes changes in characteristics such as frequency, phase, and amplitude by receiving the reflected electromagnetic waves, thereby obtaining relevant information about the target object, including distance, speed, angle, and the presence of micro-movements.??

Take the common millimeter-wave radar module as an example. Electromagnetic waves in the millimeter-wave frequency band have the characteristics of short wavelength, high resolution, and strong penetrating power. When someone approaches a smart door lock, the millimeter-wave signal emitted by the radar encounters the human body and reflects back. Due to micro-movements of the human body, such as breathing and heartbeat, the reflected signal produces a Doppler frequency shift. By precisely analyzing this frequency shift, the radar module can not only determine whether someone is near the door lock but also distinguish the human body from other stationary objects to a certain extent and even monitor some subtle human movements. This working mode based on precise electromagnetic wave analysis enables the radar module to perceive target objects relatively accurately in complex environments, providing a reliable data foundation for the intelligent decision-making of smart door locks.??

Advantages of Radar Modules in Smart Door Locks??

Accurate Detection with Reduced False Positives??

Compared with traditional human body detection methods, such as infrared sensing, the application of radar modules in smart door locks significantly improves detection accuracy. Infrared sensing is easily interfered with by environmental factors such as temperature and light. In some special cases, such as when the environmental temperature is close to human body temperature, false positives may occur, leading to unnecessary triggering or failure to trigger the smart door lock normally. In contrast, radar modules use electromagnetic waves for detection, are less affected by environmental factors, and can more accurately identify the presence and movement state of the human body.??

In practical scenarios, when someone stays near the smart door lock for a short time or moves slowly, the radar module can accurately capture these subtle changes in movement and promptly feedback signals to the smart door lock's control system. For non-human targets, such as curtains fluttering in the wind or debris blown by the wind, the radar module can effectively filter out these interference signals by analyzing the characteristics of the reflected signals, avoiding false alarms or accidental unlocking of the smart door lock and providing users with a more stable and reliable experience.??

Low-Power Design to Extend Door Lock Battery Life??

Most smart door locks are powered by batteries, so power consumption has always been a key factor restricting their performance improvement. Radar modules fully consider low-power requirements in design, adopting advanced circuit design and energy-saving algorithms to maintain low energy consumption during operation.??

Take some low-power radar modules specially designed for smart door locks as an example—their power consumption in standby mode can be as low as the microamp level. In this low-power mode, the radar module can continuously monitor the surrounding environment. Once it detects someone approaching, it quickly wakes up other functional modules of the smart door lock to enter normal operation. After the person leaves, the radar module automatically switches back to the low-power standby mode. This intelligent power management strategy not only greatly reduces the power consumption of the entire smart door lock system but also significantly extends battery life, reduces the frequency of battery replacement for users, and improves the convenience of using smart door locks.??

High Reliability for Adaptation to Complex Environments??

Smart door locks are installed outdoors or at indoor doorways, facing various complex environmental conditions such as temperature changes, humidity fluctuations, dust, and water mist. Due to the use of high-quality materials and advanced manufacturing processes, radar modules have strong environmental adaptability and reliability.??

Their working performance is not significantly affected by environmental factors such as temperature and humidity, and they can still operate stably and accurately detect human activities in harsh environments such as high temperature and high humidity. Meanwhile, radar modules have a certain penetration ability against dust, water mist, etc. Even if the door lock surface is slightly covered with dust or encounters light rain, it will not affect their normal detection function. This high reliability ensures that smart door locks can always maintain good working conditions in various complex environments, providing continuous and reliable protection for home security.??

Application Scenarios of Radar Modules in Smart Door Locks??

Automatic Wake-Up and Quick Unlocking??

When users have their hands full with items, traditional smart door locks require manual operation to unlock, while smart door locks integrated with radar modules bring a new experience. When a user approaches the door lock within a certain distance, such as 1-2 meters, the radar module quickly detects the human presence, immediately wakes up the smart door lock's control system, and activates unlocking verification functions such as facial recognition and fingerprint recognition. Without extra operations, users only need to complete identity verification in the short time before reaching the door, and the lock will automatically open, achieving true touchless unlocking and greatly enhancing the convenience of returning home.??

Abnormal Behavior Monitoring and Security Alarming??

In terms of home security protection, radar modules play an important role. They can real-time monitor human activities around the door lock. Once detecting someone lingering or wandering in front of the door for a long time, or abnormal approaching and leaving behavior patterns, such as multiple rapid approaches and departures within a short period, the radar module will quickly transmit these abnormal information to the smart door lock's control center. After the control center analyzes and confirms the abnormality, it immediately triggers the alarm mechanism, sending push notifications to the user's mobile APP, and can simultaneously link with the camera in the home security system for recording, so that users can promptly understand the situation in front of the door, take corresponding measures, and effectively prevent potential security risks.??

Linkage with Smart Home Systems to Build Intelligent Life Scenarios??

With the popularization of the smart home concept, as a key device at the home entrance, the demand for smart door locks to link with other smart home devices is increasing. Radar modules provide strong support for the deep integration of smart door locks and smart home systems. When users enter the home through the smart door lock, the radar module detects the door opening action, and the smart door lock transmits the signal to the smart home control system, which then automatically triggers a series of preset scenarios, such as turning on indoor lights, adjusting the air conditioner to a suitable temperature, opening curtains, etc., creating a comfortable and convenient home environment for users. Conversely, when users leave home, after the smart door lock is closed and the radar module detects the human body leaving, the smart home system can automatically turn off electrical devices, activate security monitoring, etc., realizing intelligent home management and improving the overall quality of home life.