The role of WiFi doorsensor in smart home systems

1,290 Published by xia, Crystal Apr 27,2019

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WiFi doorsensor is the first line of defense for smart home security. Some access control systems are based on intelligent bus and the same system platform, so smart terminal of smart home can easily access the doorbell system and management center of the video doorbell system to realize the visitor pair. Speaking, commenting, taking pictures and access control functions have become the first line of defense for family safety. These can also be equipped with intelligent proximity cards and fingerprint locks, which can realize intelligent linkage, such as synchronous disarming alarms, and turning on corresponding lights or modes.

Wireless doorsensor.


Working principle of wired doorsensor

In the smart home access control system, the function of the magnetic switch is responsible for the magnetic power of the door, the magnetic field is energized (closed door), the power is demagnetized (opening the door), the doorsensor is installed on the door and the door cover, and the switch is installed in the house, with automatic used by the door closer, it can generally withstand a pulling force of 150kg.

Wired door sensors are more concealed for flush mounting and are suitable for wired normally closed/normally open switching signals on wooden or aluminum alloy doors and windows. Door sensors are used to detect whether doors, windows, drawers, etc. are illegally opened or moved. The door magnetic system is actually the same as the bed magnet.

How wireless WiFi doorsensor work

Wireless doorsensor.

The wireless WiFi doorsensor is composed of a wireless transmitting module and a magnetic block. The wireless transmitting module has a “steel reed” component at two arrows, and the distance between the magnet and the reed pipe is kept within 1.5 cm. When the steel spring tube is in the off state, once the distance between the magnet and the steel spring tube exceeds 1.5 cm, the steel spring tube will close, causing a short circuit, and the alarm indicator light is on, and an alarm signal is sent to the host.

The wireless WiFi doorsensor’s wireless alarm signal can transmit 200 meters in the open space and 20 meters in the general house, which is closely related to the surrounding environment. Wireless WiFi doorsensor is generally designed to save power. When the door is closed, it does not transmit radio signals. At this time, the power consumption is only a few microamps. When the door is opened, it immediately transmits a wireless alarm signal for about 1 second, and then stops by itself. At this time, even if the door is always open, it will not transmit any more signals.

The wireless WiFi doorsensor is also designed with a battery low voltage detection circuit. When the voltage of the battery is lower than 8 volts, the lower LP LED will be lit. At this time, the special battery needs to be replaced immediately, otherwise the reliability of the alarm will be affected.

The wireless WiFi door magnet is generally mounted on the inside of the door. It consists of two parts: the smaller part is a permanent magnet, the inside has a permanent magnet to generate a constant magnetic field, and the larger is the wireless door magnet body. There is a normally open reed switch. When the permanent magnet and the reed switch are in close proximity (less than 5 mm), the wireless door magnet is in a working state.

When the permanent magnet leaves the reed switch for a certain distance, the wireless WiFi gate magnet immediately transmits a high-frequency radio signal of 315 MHz including the address code and its own identification code (that is, the data code), and the receiving board recognizes the address code of the radio signal. Determine whether it is the same alarm system, and then determine which wireless WiFi door alarm is based on its own identification code (that is, the data code).

The application of doorsensor system in smart life

As a smart home system, the components are small, the technical content is relatively low, and the production cost is low. Indeed, when the smart home market was crazy, it became the entrance of many manufacturers or individuals into the smart home field, but it also caused the follow-up phenomenon. Aftereffects: the quality of mixed fish and dragons has destroyed the reputation of the door sensor products in the market. Excessive market output also affects sales. Although the current price of magnetic door has plummeted, ordinary citizens are easy to buy, but they still cannot hide their presence in the smart home market. The status and sense of presence have fallen sharply.

The smart home system of the Internet of Things consists of a home environment-aware interaction layer, a network transport layer, and an application service layer. The home environment-aware interaction layer is composed of various sensor nodes with wired or wireless functions, mainly to collect household environment information, acquire owner status, and enter guest identity features. The network transport layer is mainly responsible for home information and director control information. Transmission; the application service layer is responsible for controlling the home facility or application service interface.

The WiFi door magnet in the doorsensor system belongs to the family environment-aware interaction layer. There are two ways for a gangster to enter the house from the door: one is to steal the key of the owner and open the door; the other is to open the door with the aid of a tool. Regardless of the way the gangster enters, he must push the house door open.

Once the thief pushes the door open, the door and the door frame will be displaced, and the door magnet and the magnet will also be displaced at the same time. The electric wave signal is immediately transmitted to the host, and the host sounds an alarm and dials 6 preset telephone numbers. Thereby providing more intelligent security protection for home life, ensuring family life and property security.

The really easy-to-use products will not be ignored. The WiFi doorsensor system is small, but it has an extremely important position in the overall scene of smart home. I believe that with the attention of manufacturers and the development of technology, the magnetic energy of the door will once again return to the public, for the intelligence. Home life offers a “small but beautiful” quality experience.

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