Shenzhen E-5Continents Co., Ltd
Working Principle of Wireless Door Magnetic Sensor
Release time:
2018-04-18 10:22
Source:
The wireless door magnet sensor is used to monitor the opening and closing status of the door. When the door is opened for whatever reason, the wireless door magnet sensor immediately transmits a specific radio wave and alarms the host computer from a distance. The wireless alarm signal of wireless door magnet can transmit 200 metres in open area and 20 metres in general residence, which is closely related to the surrounding environment.
Wireless door magnet generally use power-saving design, when the door is closed, it does not transmit radio signals, power consumption at this time only a few microamps, when the door is opened at the moment, immediately launch a wireless alarm signal for about 1 second, and then stop by itself, then even if the door has been opened and will not be launched, which is designed to prevent the transmitter from transmitting continuously caused by the internal battery depletion and the impact of the alarm, the wireless door magnet is also designed to have a low battery voltage detection circuit, when the battery voltage is lower than the battery voltage to the host alarm. Wireless door magnet is also designed with a battery low voltage detection circuit, when the battery voltage is lower than 8 volts, the lower LP light-emitting diode will light up, then you need to immediately replace the A23 alarm battery, otherwise it will affect the reliability of the alarm.
Wireless door magnetic sensor is generally installed on the inside of the door above, it consists of two parts: smaller parts for the permanent magnet, there is a permanent magnet inside, used to produce a constant magnetic field, the larger is the main body of the wireless door magnet, which has a normally open reed switch, when the permanent magnet and the reed switch close (less than 5 mm), the wireless door sensor is in the work of the guard state, when the permanent magnet away from the reed switch after a certain distance, the wireless door magnetic sensor immediately When the permanent magnet leaves the reed switch after a certain distance, the wireless door sensor immediately transmits a 315MHZ high-frequency radio signal containing the address code and its own identification code (that is, the data code), the receiver board is to identify the radio signal by the address code to determine whether it is the same alarm system, and then according to its own identification code (that is, the data code), to determine which one of the wireless door magnet alarm.
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Address: 4th Floor, Building B2, Hezhou Sunshine Industrial Park, Xixiang, Bao 'an District, Shenzhen
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