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The Working Principle of Door Magnetic Sensor and Its Application in Smart Home

127 Published by xia, Crystal May 31,2019

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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, which can realize intelligent linkage, such as synchronous disarming alarms, and turning on corresponding lights or modes.

Wireless door magnetic sensor.

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 magnetic door 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 magnetic door is more concealed for embedded installation. It is understood that it is suitable for wired normally closed/normally open switch signals for wooden or aluminum alloy doors and windows. Door magnets 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.

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. Generally, it adopts power-saving design. When the door is closed, it does not transmit radio signals. At this time, the power consumption is only a few micro-amps. When the door is opened, it immediately transmits a wireless alarm signal for about 1 second, and then stops by itself. The door is always open and will not emit any more signals.

Wireless door magnetic sensor.

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: Installation

The 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. Finally, the two parts will be The cover is installed. 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 damaged 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.

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