The working principle of door magnetic sensor and the application of door magnetic system in smart home
The door magnetic system, as the first line of defense for the smart home security part, can be generally divided into three parts: the door magnetic switch, the door magnetic sensor (detector), and the door magnetic alarm.
Some access control systems are based on the intelligent bus and the same system platform, so the smart home smart terminal can easily access the video doorbell system door machine and management center to realize the guest intercom, message, photo and access control functions, and become home safe. The first line of defense. These can also be equipped with intelligent proximity cards and fingerprint locks for intelligent linkage, such as synchronous disarming alarms, turning on corresponding lights or modes.
In the smart home access control system, the function of the magnetic switch is responsible for the magnetic power of the door, the magnetic circuit (closed door), the degaussing (opening), the magnetic installation on the door and the door cover, the switch is installed in the house, with automatic Used by the door closer, it can generally withstand a pulling force of 150 kg.
The wired door magnet is more concealed for the embedded installation. According to the understanding of the opening and closing of the sensor door and window, it is suitable for the wired normally closed/normally open switch signal of the wooden or aluminum alloy door and window. Door magnets are used to detect whether doors, windows, drawers, etc. are illegally opened or moved. It consists of a wireless transmitter and a magnetic block. The door magnetic system is actually the same as the bed magnet. Here is mainly the case of the door magnet.
The wireless door magnet is composed of a wireless transmitting module and a magnetic block. The wireless transmitting module has a "steel reed" component at two arrows, when the distance between the magnet and the reed pipe is kept within 1.5 cm. 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 door alarm 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. The wireless door magnet generally adopts a power-saving design. When the door is closed, it does not transmit a radio signal. At this time, the power consumption is only a few micro-amps. When the door is opened, the wireless alarm signal is immediately transmitted for about 1 second, and then stops by itself. At this time, even if the door is always open, no signal will be transmitted.
The wireless door magnet 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. In this case, the A23 alarm battery must be replaced immediately, otherwise the reliability of the alarm will be affected. .
The wireless door sensor 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, Xiaobian found that when the permanent magnet and the reed switch are close together (less than 5 mm), the wireless magnetic sensor is in the working state.
When the permanent magnet leaves the reed switch for a certain distance, the wireless magnetic sensor immediately transmits a high-frequency radio signal of 315 MHz including the address code and its own identification code (that is, the data code). The receiving board recognizes the address code of the radio signal. Determine whether it is the same alarm system, and then determine which wireless door magnetic alarm is based on its own identification code (that is, the data code).
Switch principle: installationThe magnetic switch is often installed at the door and window of the home. If you need it, you don't have to find someone to install it yourself. First, buy the magnetic switch and wipe the installation position of the magnetic switch.
Secondly, use the screw to fix the switch part and the magnet part on the door and the door frame respectively, pay attention to the position; in the end, install the two parts of the cover. At this point, the magnetic switch is installed successfully.
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 the mixed fish and dragons has destroyed the reputation of the 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, 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 dramatically.
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 door magnetic sensor in the door magnetic system belongs to the family environment sensing interaction layer. The English name of the wireless door magnet is Doorsensor. 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 door and window sensor system is small, but it has an extremely important position in the overall scene of the smart home. Thousands of people believe that with the attention and technical development of the manufacturers, the door and window sensors can return to the public again. Smart home life offers a "small but beautiful" quality experience.
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Danyang Horse Optical Co., Ltd , https://www.dyhorseoptical.com