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The door sensor system in our life can generally be divided into three parts: door sensor switch, door sensor (detector) and door sensor. The access control system, also known as access control system, integrates microcomputer automatic identification technology and modern security management measures, and involves many new technologies such as electronics, machinery, optics, computer technology, communication technology, and biotechnology. The doorbell system has become the first line of defense in our home security, so what is the principle of the access control system? The following briefly introduces the principle of the access control system.
The principle of access control system
1.The principle of independent access control system
Independent access control is non-network type, each door lock is independent, and its information reading is usually card type and induction type. The principle is that the card reader is used to read the smart card information (card number) of the card reader, and then convert it into an electrical signal to send to the access controller. Based on the received card number, the controller determines whether the cardholder has been Authorization can enter the gate during this time period, and complete the work of unlocking and maintaining the lock according to the judgment.
2.The principle of networked access control system
The networked access control system is composed of a controller, a card reader, an electronically controlled lock, a door open button, etc. It manages all information analysis and processing in the system through the computer equipped with the software of the access control system. The principle is that the controller accepts personnel information and corresponding authorization information sent from the management computer, and at the same time transmits the card entry and exit records to the computer. A single controller can form a simple access control system to manage one or two doors. Multiple controllers are connected to the computer through the communication network to form an access control system for the entire building.
Analysis of door sensor principle
1.Working principle of wired magnetic sensor
In the smart home access control system, the function of the door magnetic switch is responsible for whether the door magnet is energized, energized with magnetism (closed door), power-off degaussed (open door), the door magnet is installed on the door and the door cover, the switch is installed in the house, cooperate with The use of door closers can generally withstand 150 kg of pulling force.
Wired door magnets are more concealed for embedded installation, sensing the opening and closing of doors and windows, suitable for wood or aluminum alloy doors and windows to send wired normally closed / normally open signal. Door magnetism is 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 sensor system is actually the same principle as the bed sensor. Here, the door sensor is mainly used as an example of the cable displacement sensor.
2.Working principle of wireless door sensor
The wireless door sensor is composed of a wireless transmission module and a magnetic block. There are two "steel reed" components at the two arrows of the wireless transmission module. When the distance between the magnet and the steel reed is kept within 1.5 cm The steel reed pipe is in a disconnected state. Once the 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 emit an alarm signal to the host. The wireless door magnetic sensor is used to monitor the opening and closing status of the door. When the door is opened for any reason, the wireless door magnetic sensor immediately emits a specific radio wave and alarms the host from a long distance.
The wireless alarm signal of the wireless door sensor can transmit 200 meters in open areas and 20 meters in general houses, 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 emit radio signals. At this time, the power consumption is only a few microamperes. When the door is opened, it immediately emits a wireless alarm signal for about 1 second, and then stops by itself. At this time, even if the door is kept open, it will not transmit anymore. This is to prevent the transmitter from continuously emitting and causing the internal battery to run out of power, which will affect the alarm. When the voltage is low, the LP light-emitting diode below will light up. At this time, it is necessary to immediately replace the A23 alarm special battery, otherwise it will affect the reliability of the alarm displacement sensor.
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