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| Application of door magnetic system in smart life |
| 2022.06.02 |
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The door magnetic system, as the first line of defense of the smart home security part, can generally be divided into three major parts: door magnetic switches, door magnetic sensors (detectors), and door magnetic alarms.
Some access control systems are based on smart buses and the same system platform, so that smart terminals in smart homes can easily access the door phone and management center of the video doorbell system to achieve visitor intercom, message, photo and access control functions, making it a safe home. first line of defense. These can also be equipped with smart induction cards and fingerprint locks at the same time, which can realize intelligent linkage, such as synchronously disarming the alarm, turning on the corresponding lights or modes, etc.
The working principle of wired magnetic door sensor
In the smart home access control system, the role of the door sensor switch is to be responsible for whether the door magnetic is energized or not, energized with magnetic (closed door), demagnetized when powered off (opening), the door sensor is installed on the door and door cover, the switch is installed in the house, with automatic When used as a door closer, it can generally withstand a pulling force of 150 kg.
The wired door magnet is more concealed for embedded installation. According to Qianjia, it senses the opening and closing of doors and windows, and is suitable for wooden or aluminum alloy doors and windows to send wired normally closed/normally open switch signals. Door sensors are used to detect whether doors, windows, drawers, etc. have been opened or moved illegally. It consists of a wireless transmitter and a magnetic block. The door magnetic system is actually the same as the bed magnetic system. Here we mainly take the door magnetic as an example.
The wireless door sensor is composed of a wireless transmitter module and a magnetic block. There is a "steel reed pipe" component at the two arrows in the wireless transmitter module. When the distance between the magnet and the steel reed pipe is kept within 1.5 cm , the steel reed pipe is in the disconnected state, once the separation distance between the magnet and the steel reed pipe exceeds 1.5 cm, the steel reed pipe will be closed, causing a short circuit, and the alarm indicator light will be on and an alarm signal will be sent to the host.
The wireless alarm signal of the wireless door sensor can transmit 200 meters in the open area and 20 meters in the general residence, which is closely related to the surrounding environment. The wireless door sensor generally adopts a power-saving design. 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 point, the signal will no longer be transmitted even if the door is kept open.
The wireless door sensor is also designed with a battery low voltage detection circuit. When the battery voltage is lower than 8 volts, the LP light-emitting diode below will light up. At this time, it is necessary to replace the special battery for the A23 alarm immediately, otherwise it will affect the reliability of the alarm. .
The wireless door magnetic sensor is generally installed above the inner side of the door. It consists of two parts: the smaller part is a permanent magnet, and there is a permanent magnet inside to generate a constant magnetic field, and the larger one is the wireless door magnetic body, which is inside There is a normally open reed switch. When the permanent magnet and the reed switch are very close (less than 5 mm), the wireless door sensor is in a working waiting state.
When the permanent magnet leaves the reed switch for a certain distance, the wireless door sensor immediately transmits a 315MHZ high-frequency radio signal containing the address code and its own identification code (that is, the data code). The receiving board recognizes the address code of this radio signal. Determine whether it is the same alarm system, and then determine which wireless door sensor alarm is based on its own identification code (that is, the data code).
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 in the past, it became the entrance for many manufacturers or individuals to enter the smart home field, but it also caused the phenomenon of following the trend. Sequelae: The mixed quality has destroyed the reputation of door and window sensor products in the market. Excessive market output also affects sales. Although the current price of door and window sensor products has plummeted, and ordinary citizens are easy to buy, it still cannot hide its popularity in the smart home market. The status and presence of people have dropped significantly.
The smart home system of the Internet of Things consists of a home environment perception interaction layer, a network transmission layer and an application service layer. The home environment perception and interaction layer is composed of various sensor nodes with wired or wireless functions, which mainly realize the collection of home environment information, the acquisition of the owner's status, and the entry of the visitor's identity characteristics; the network transmission layer is mainly responsible for the home information and the director's control information. Transmission; the application service layer is responsible for controlling home facilities or application service interfaces.
The door magnetic sensor in the door magnetic system belongs to the home environment perception and interaction layer. The English name of the wireless door sensor is Doorsensor. Generally, there are two ways for criminals to enter the house from the door: one is to steal the owner's key and open the door; the other is to use tools to pry the door open. No matter how the gangster entered, he had to push open the door of the house.
Once the thief pushes the door, the door and the door frame will be displaced, the door magnet and the magnet will also be displaced at the same time, the radio signal will be sent to the host immediately, the host will sound the alarm and dial 6 groups of preset phone numbers. In this way, it can play a more intelligent security protection for home life, and ensure the safety of family life and property.
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