| Before the technology is developed enough,in order to prevent illegal invasion and a variety of sabotage activities.For now,criminals are able to use advanced technology to commit a crime in more complex and intelligent ways.The traditional precautionary means are difficult to satisfy the security needs for vital department or key units.Therefore,a more precise,intelligent,stable and reliable security equipment is needed in security field.And electronic fence is widely used as a most developed anti-theft system.Among variety types of electronic fence,due to the tension-type electronic fence uses brand-new detection method and special signal processing method,the changing of environment has little impact on static value,alarm value or threshold of tension,it completely avoided the shortcomings of traditional security detectors such as low environmental adaptability or false alarm.Therefore,tension-type electronic fence can be applied in hash environment of wind,frost,rain,snow,thick fog,dust,high temperature,low temperature,etc.When illegal invasion is occurred,Alarm Management Center can receive the alarm and alert alarms of light and sound,and other devices(camera etc.)can be activated.This paper presents a system of tension electronic fence based on STM32 microprocessor.With the design of the controller as the starting point,a detailed description of the tension-type electronic fence is introduced in both hardware part and software part.Under the controller of CPU,the tension sensor is able to detect the tension of peripheral cables,the system will determine whether there is an abnormal situation by comparing the pressure value with the threshold.In addition,Installation Mode and Normal Mode can be set by pressing a button in order to make different warning forms.Using the electronic fence system proposed in this paper,functions such as cross-border detection,fence relaxation detection and damage warning can be achieved in simulation test. |
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