The door magnetic system in our life can generally be divided into three parts: door magnetic switch, door magnetic sensor (detector) and door magnetic alarm. Some access control systems are based on smart buses and the same system platform, so that smart home smart terminals can be easily connected to video doorbell system gateways and management centers to implement guest talk, message, photo and access control functions, and become our home security. The first line of defense. These can also be equipped with smart proximity cards and fingerprint locks, which can achieve intelligent linkage, such as synchronized disarming alarms, and turning on lights or modes.
　 How Wired Magnetic Sensors Work
The function of the door magnetic switch in the smart home access control system is to take charge of the door magnetic flux, energize the magnetic field (close the door), deenergize the power (open the door), install the door magnetic on the door and the door cover, and install the switch in the room, with automatic The use of door closers, generally can withstand 150 kilograms of tension.
Wired door magnets are more concealed for embedded installation, and the opening and closing of induction doors and windows are suitable for sending normally closed/normally open switch signals for wooden or aluminum alloy doors and windows. Door magnetism is 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 magnetic principle of the bed. Here's an example of door magnetism.
How wireless magnetic sensor works
The wireless door magnetism is composed of two parts: a wireless transmitter module and a magnetic block. In the wireless transmitter module, there are two components of a "steel spring tube" at the arrow, when the distance between the magnet and the steel reed tube is kept within 1.5 centimeters. The steel reed pipe is in the disconnected state. Once the distance between the magnet and the steel reed pipe is more than 1.5 cm, the steel reed pipe will close, causing a short circuit, and the alarm indicator will light up and emit an alarm signal to the host. The wireless door sensor is used to monitor the door's on/off status. When the door is opened for any reason, the wireless door sensor immediately transmits a specific radio wave and alarms the host at a long distance.
The wireless alarm signal wirelessly transmits 200 meters in an open space, and can transmit 20 meters in a typical house, which is closely related to the surrounding environment. Wireless door magnets generally use power saving design. When the door is closed, it does not emit radio signals. At this time, the power consumption is only a few microamps. When the door is opened, it immediately emits a wireless alarm signal for about 1 second, and then stops automatically. At this time, even if the door is always open, it will not be fired again. This is to prevent the continuous emission of the transmitter causing the internal battery to be depleted and affect the alarm. The wireless door sensor is also designed with a battery low voltage detection circuit when the battery voltage is lower than 8 At the time of volt, the lower LP light-emitting diodes will light up. At this time, the A23 alarm battery must be replaced immediately. Otherwise, the reliability of the alarm will be affected.
The wireless door sensor is generally installed on the inner side of the door. It consists of two parts: the smaller part is a permanent magnet, and the inner part has a permanent magnet to generate a constant magnetic field. The larger is a wireless door magnetic main body. There is a normally open type reed switch. When the permanent magnet and the reed switch are in close proximity (less than 5 mm), the wireless magnetic sensor is in working standby state. When the permanent magnet leaves the reed switch for a certain distance, the wireless door The magnetic sensor immediately transmits a 315 MHz high-frequency radio signal containing the address code and its own identification code (ie, data code). The receiving board identifies the radio signal's address code to determine whether it is the same alarm system and then identifies itself. Code (that is, data code) to determine which wireless door sensor alarm.
Application of door magnetic system in real life
This is a concealed door magnet commonly available on the market. There are built-in magnets on one end without wires, and there are reed switches and other components inside the lower end of the wires. When the magnet approaches, the wire outputs a closing signal when the magnet When it is far away, two wires output an open signal. The unwired end is attached to the top of the door, and the end with the wire is attached to the door frame. When the door is closed, both ends overlap closely. There are still some magnets on the market that are square and suitable for use in exposed applications for doors and windows.
Which characteristic door magnet can be used in the access control system:
The closed signal is output when the door closes (the resistance measured by the multimeter is 0), and the open signal is input when the door is open. (Measure resistance infinite with a multimeter)
90% of the door magnets on the market have this characteristic. There are still a small number of door magnet characteristics that are just the opposite, or both the closed signal and the open signal have outputs (three lines, one is common, and the other two are connected to the common line to output the open and closed signals respectively. When you use them, you can choose one of them, and one of the features is idle. Some of the electric locks are also magnetic. For example: 5-wire power plugs (2 are power supplies, 3 are door magnetic signal cables), 8 wire electrical plugs (not only with magnetic output, but also with lock position status output ), Idle unused lines.
In real-time monitoring of software, you can see whether each door is currently open or closed. It can cooperate with the access controller to enable the door to be illegally entered (the legal operation without a card or button press, and the door is opened, such as open or open). It can cooperate with the access controller to enable the door to close the alarm for a long time.
If you do not need these functions of the access control system, you can not visit the magnetic door. If these functions are needed, the door magnets are connected to the door's magnetic input point of the controller, and there is no need to distinguish between positive and negative. If a large multi-door access control system uses only several functions for door magnetism, other door magnetic input points are short-circuited with wires to avoid false alarm signals.
The IoT smart home system consists of the family environment awareness interaction layer, network transmission layer, and application service layer. The family environment awareness interaction layer is composed of various sensor nodes with wired or wireless functions. It mainly realizes the collection of family environment information, the acquisition of the owner state, and the entry of the visitor's identity characteristics. The network transmission 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 is what we call the family environment perception interaction layer. The English name of wireless door magneto is Door sensor. Generally, there are two methods for criminals 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 tools. Regardless of the method used by criminals to enter, he must push the door open. Once the thief pushes the door open, the door and the door frame will be shifted, the door magnet and the magnet will also be displaced at the same time, and the (radio) signal will be transmitted to the host immediately. The host will ring the alarm and dial 6 preset telephone numbers. So as to play a more intelligent security protection for home life. Safeguard family life and property safety.
　 How Wired Magnetic Sensors Work
The function of the door magnetic switch in the smart home access control system is to take charge of the door magnetic flux, energize the magnetic field (close the door), deenergize the power (open the door), install the door magnetic on the door and the door cover, and install the switch in the room, with automatic The use of door closers, generally can withstand 150 kilograms of tension.
Wired door magnets are more concealed for embedded installation, and the opening and closing of induction doors and windows are suitable for sending normally closed/normally open switch signals for wooden or aluminum alloy doors and windows. Door magnetism is 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 magnetic principle of the bed. Here's an example of door magnetism.
How wireless magnetic sensor works
The wireless door magnetism is composed of two parts: a wireless transmitter module and a magnetic block. In the wireless transmitter module, there are two components of a "steel spring tube" at the arrow, when the distance between the magnet and the steel reed tube is kept within 1.5 centimeters. The steel reed pipe is in the disconnected state. Once the distance between the magnet and the steel reed pipe is more than 1.5 cm, the steel reed pipe will close, causing a short circuit, and the alarm indicator will light up and emit an alarm signal to the host. The wireless door sensor is used to monitor the door's on/off status. When the door is opened for any reason, the wireless door sensor immediately transmits a specific radio wave and alarms the host at a long distance.
The wireless alarm signal wirelessly transmits 200 meters in an open space, and can transmit 20 meters in a typical house, which is closely related to the surrounding environment. Wireless door magnets generally use power saving design. When the door is closed, it does not emit radio signals. At this time, the power consumption is only a few microamps. When the door is opened, it immediately emits a wireless alarm signal for about 1 second, and then stops automatically. At this time, even if the door is always open, it will not be fired again. This is to prevent the continuous emission of the transmitter causing the internal battery to be depleted and affect the alarm. The wireless door sensor is also designed with a battery low voltage detection circuit when the battery voltage is lower than 8 At the time of volt, the lower LP light-emitting diodes will light up. At this time, the A23 alarm battery must be replaced immediately. Otherwise, the reliability of the alarm will be affected.
The wireless door sensor is generally installed on the inner side of the door. It consists of two parts: the smaller part is a permanent magnet, and the inner part has a permanent magnet to generate a constant magnetic field. The larger is a wireless door magnetic main body. There is a normally open type reed switch. When the permanent magnet and the reed switch are in close proximity (less than 5 mm), the wireless magnetic sensor is in working standby state. When the permanent magnet leaves the reed switch for a certain distance, the wireless door The magnetic sensor immediately transmits a 315 MHz high-frequency radio signal containing the address code and its own identification code (ie, data code). The receiving board identifies the radio signal's address code to determine whether it is the same alarm system and then identifies itself. Code (that is, data code) to determine which wireless door sensor alarm.
Application of door magnetic system in real life
This is a concealed door magnet commonly available on the market. There are built-in magnets on one end without wires, and there are reed switches and other components inside the lower end of the wires. When the magnet approaches, the wire outputs a closing signal when the magnet When it is far away, two wires output an open signal. The unwired end is attached to the top of the door, and the end with the wire is attached to the door frame. When the door is closed, both ends overlap closely. There are still some magnets on the market that are square and suitable for use in exposed applications for doors and windows.
Which characteristic door magnet can be used in the access control system:
The closed signal is output when the door closes (the resistance measured by the multimeter is 0), and the open signal is input when the door is open. (Measure resistance infinite with a multimeter)
90% of the door magnets on the market have this characteristic. There are still a small number of door magnet characteristics that are just the opposite, or both the closed signal and the open signal have outputs (three lines, one is common, and the other two are connected to the common line to output the open and closed signals respectively. When you use them, you can choose one of them, and one of the features is idle. Some of the electric locks are also magnetic. For example: 5-wire power plugs (2 are power supplies, 3 are door magnetic signal cables), 8 wire electrical plugs (not only with magnetic output, but also with lock position status output ), Idle unused lines.
In real-time monitoring of software, you can see whether each door is currently open or closed. It can cooperate with the access controller to enable the door to be illegally entered (the legal operation without a card or button press, and the door is opened, such as open or open). It can cooperate with the access controller to enable the door to close the alarm for a long time.
If you do not need these functions of the access control system, you can not visit the magnetic door. If these functions are needed, the door magnets are connected to the door's magnetic input point of the controller, and there is no need to distinguish between positive and negative. If a large multi-door access control system uses only several functions for door magnetism, other door magnetic input points are short-circuited with wires to avoid false alarm signals.
The IoT smart home system consists of the family environment awareness interaction layer, network transmission layer, and application service layer. The family environment awareness interaction layer is composed of various sensor nodes with wired or wireless functions. It mainly realizes the collection of family environment information, the acquisition of the owner state, and the entry of the visitor's identity characteristics. The network transmission 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 is what we call the family environment perception interaction layer. The English name of wireless door magneto is Door sensor. Generally, there are two methods for criminals 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 tools. Regardless of the method used by criminals to enter, he must push the door open. Once the thief pushes the door open, the door and the door frame will be shifted, the door magnet and the magnet will also be displaced at the same time, and the (radio) signal will be transmitted to the host immediately. The host will ring the alarm and dial 6 preset telephone numbers. So as to play a more intelligent security protection for home life. Safeguard family life and property safety.
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