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.
How does the wired magnetic sensor work?
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.
How does the wireless magnetic sensor work?
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).
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