Abstract: Smart door locks are locks that are more intelligent in terms of user identification, security, and management than traditional mechanical locks. It is the executive part of the lock door in the smart access control system. This paper describes the application Shiqiang proxy linear Hall sensor MLX90251 in intelligent door lock.
Smart lock system
In Figure 1 is Shi Qiang 's block diagram of the entire smart lock. The switch to achieve the door lock ultimately controls the precise displacement of the latch. There are traditional photoelectric switches and mechanical limit switches for position detection. However, due to the poor precision of these devices, and the large size is not enough in the application of smart locks. The linear Hall sensor of Shiqiang agent can overcome the above shortcomings. With very small size, the installation is very good. In application, it is only necessary to embed a small magnet on the latch to achieve accurate position detection in millimeters.
Figure 1 smart lock block diagram
Linear Hall sensor features
Shiqiang's MLX90251 is a CMOS programmable high performance Hall sensor manufactured by Melexis. Output an analog quantity proportional to the strength of the magnetic field. The internal integration of digital signal processor DSP, programmable filter and temperature compensation and other functional modules. And the output voltage can be clamped to a certain value as needed. The relevant technical solutions can also be learned on the Shiqiang component e-commerce platform.
Figure 2, Linear Hall Sensor Application Circuit
to sum up
The Melexis linear Hall sensor MLX90251, which is represented by Shiqiang, has the advantages of high precision, high sensitivity, low power consumption, flexible design, etc. It can be well applied to displacement detection such as smart door locks, and the circuit design is simple and reliable, and the external circuit only needs Two capacitors and one resistor.
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