It is believed that many people have had the experience of being locked out of their homes when they have gone home, only to find that their keys have been lost or forgotten, and smart door locks will solve this problem. This article will introduce a set of smart door lock reference designs for you, so that manufacturers who intend to enter this market can accelerate the design and development of smart door locks.

An enormous prospect of the application market for smart door locks

The smart door lock allows users to stop having to carry a bunch of keys, and there is no risk of losing keys. Through NFC technology, owners with heavy things can also avoid using their key to enter their house. The smart door lock will be the most important entrance to an intelligent life. Currently, the mainstream smart door locks support various authentication technologies, including passwords, NFC smart phones, fingerprint identification, etc., while the smart door locks on the market also support a variety of authentication technologies at the same time, providing users with more flexibility and increasing the added value of products.

The sharing economy is flourishing at present, and the short-term renting of online accommodation is popular around the world, which makes many people rent out their spare rooms or houses, but if they provide a traditional key for the short-term tenants, there is a risk that the key will be duplicated. This problem can be solved efficiently if smart door locks are used. The landlord can set a short-term valid password for the tenant and cancel the validity of the password at the end of the stay, so a smart door lock will be the best choice for those who intend to rent their house for a short period of time.

In addition, because the smart door lock can record the identity and the access time of each person, through an APP and remote monitoring function, users can know if the elderly and children have returned home. If there is an abnormal access or destruction of the door lock, they also can communicate remotely, which makes the smart door lock becomes the first line of defense of an intelligent life.

The first edition of the ST smart door lock reference design (Phase I) developed by Arrow ESC provides an excellent reference template for manufacturers interested in developing smart door locks. The reference design uses devices from STMicroelectronics, including microcontrollers, NFC chips, MEMS sensors, etc. According to the complexity of the client application, STM32 M0 or M4 (pin-to-pin compatible) can be used as the core microcontroller, with the deployment of an NFC Initiators/ high frequency (HF) reader IC, as well as an analog front-end (AFE) and highly integrated data framing system for multiple standards, and the MEMS sensor is used to detect abnormal knocks on doors, provide alerts and blocked access.

The features of the smart door lock system include support for NFC tag access (ISO14443 type A), password access, support for anomaly knocks alerts on doors in the second edition, as well as access via NFC-enabled smartphones, and fingerprint access in the phase II edition. Its core chips include ST microcontroller STM32L071RBT6/STM32L431RBT6, NFC chip ST25R3913AQF, MEMS sensor LIS2DH12TR, and power chip LD3905PU33R, which are the best choice for smart door lock application.

The development space of smart door lock applications is unlimited, which is still in the initial stage of market development, mainly used in high grade residences, commercial hotels and other fields. However, as the price of smart door locks is decreasing gradually, they are starts to enter ordinary homes and the market growth momentum is extremely strong. In addition, the smart door locks can be integrated with the intelligent housing system to support the interactions between IoT devices, and remote control, with an APP to set and control the smart door lock, which greatly simplifies the complexity of the operation of the smart door lock, records the identity and time of each person, makes human life more convenient and the development of the smart door lock application market will have great potential.

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