The door magnetic system plays a crucial role in modern home security, typically consisting of three key components: the door magnetic switch, the magnetic sensor (or detector), and the alarm system. Many access control systems today are built on smart bus platforms, allowing smart home devices to seamlessly integrate with video doorbells, gateways, and management centers. This integration enables features such as guest communication, message alerts, photo capture, and remote access control, making it a vital first line of defense for home safety. These systems can also be enhanced with smart proximity cards or fingerprint locks, enabling intelligent interactions—like automatic alarm disarming, lighting activation, or scene mode switching.
**How Wired Magnetic Sensors Work**
In a smart home access control system, the door magnetic switch is responsible for detecting the door’s magnetic field. When the door is closed, the magnetic field is energized, and when it’s open, the power is cut off. The switch is usually installed inside the room, while the magnet is mounted on the door and door frame. These sensors often work with automatic door closers and are designed to withstand up to 150 kilograms of force. Wired door magnets are ideal for embedded installations and are commonly used to monitor wooden or aluminum alloy doors and windows. They send either normally closed or normally open signals based on the door’s position. Their function is similar to that of a bed sensor, where the presence or absence of a magnetic field triggers an action.
**How Wireless Magnetic Sensors Work**
Wireless door magnets consist of two main parts: a wireless transmitter module and a magnetic block. Inside the transmitter, there is a "reed switch" that remains open when the magnet is within 1.5 cm. If the distance exceeds this, the reed switch closes, triggering a short circuit and sending an alarm signal to the host. These sensors are used to monitor whether a door is open or closed. When the door opens, the wireless sensor immediately sends a radio signal, alerting the system even from a distance. In open spaces, these signals can travel up to 200 meters, but in typical homes, the range is around 20 meters, depending on the environment.
To conserve battery life, wireless door sensors only transmit signals when the door is opened. Once triggered, they send a 1-second alarm signal and then stop automatically. Even if the door remains open, the sensor will not trigger again, preventing unnecessary battery drain. Most models also include a low-battery warning. When the voltage drops below 8 volts, an LED indicator lights up, signaling the need to replace the A23 battery. Failure to do so may compromise the system's reliability.
Typically, the wireless sensor is installed on the inside of the door. It includes a permanent magnet and a reed switch. When the magnet is close (within 5 mm), the sensor is in standby mode. When the magnet moves away, it sends a 315 MHz high-frequency signal containing an address code and its unique identifier. The receiver checks the address code to confirm it belongs to the same system and then identifies which specific sensor triggered the alarm.
**Real-Life Applications of Door Magnetic Systems**
A common concealed door magnet has a built-in magnet on one end and a reed switch on the other. When the magnet approaches, the wire outputs a closed signal; when it moves away, it sends an open signal. One end is attached to the door, and the other to the door frame. Some magnets are square-shaped and used for visible applications on doors and windows.
**Key Characteristics of Door Magnets in Access Control Systems**
Most door magnets on the market output a closed signal when the door is shut (measured as 0 ohms with a multimeter) and an open signal when the door is open (infinite resistance). However, a small percentage of door magnets have opposite behavior or even provide both signals. Some electric locks also incorporate magnetic functionality, such as 5-wire or 8-wire connectors, where some lines remain unused.
In real-time monitoring software, users can track whether each door is open or closed. These sensors can work with access controllers to detect unauthorized entry, such as when a door is opened without a card or button press. They can also trigger alarms if a door remains open for too long.
If you don’t need advanced features, you can skip the door magnets. But if required, simply connect them to the controller’s magnetic input point, without worrying about polarity. In large multi-door systems, unused magnetic inputs can be short-circuited to prevent false alarms.
The IoT smart home system is structured into three layers: the environmental awareness layer, the network transmission layer, and the application service layer. The environmental awareness layer includes various wired or wireless sensors, collecting data on the home environment, user status, and visitor identification. The network layer handles information and control signal transmission, while the application layer manages home devices and service interfaces.
The door magnetic sensor falls under the environmental awareness layer. Known as a "door sensor," it helps detect unauthorized access. Criminals can either steal keys or use tools to force entry. Either way, they must push the door open. As the door moves, the magnetic sensor detects the shift and sends an alarm signal to the host, triggering an alert and calling up to six preset numbers. This intelligent system provides effective protection for family safety and property.
Outdoor Round Whirlpool,5 Person Round Hot Tub,Round Outdoor Spa Hot Tub,5 Person Spa Hot Tub
SpaRelax Co., Ltd. , https://www.sparelaxoutdoorspa.com