基于单片机控制的多路激光安防报警装置设计

摘要

In order to enhance the reliability and stability of the security system ,the design of Multi-channel laser security alarm system based onmicrocomputer control is designed in this paper. based on microcomputer control,Multi-channel laser security alarm system Consists of the laser emission circuit, laser receiving circuit and so on; ifThe laser path channel is interrupted, Photosensitive resistance will present significant voltage change, Through the program control,ADC0809 constantly sampling voltage, will capture this change,If the voltage exceeds the threshold, make the voice alarm and GPRS alarm, this systems adopts parallel interface chip 8255 to make Dynamic scanning of Digital tube,Can easily modified threshold of each channel by manual or Program’s-modify mode.Practical application shows that the system response speed, stable, safe and reliable.%为了增强安防系统的可靠性和稳定性，提出了一种基于单片机控制的多路激光安防报警装置的设计方案，并完成了系统的软硬件设计。该系统硬件主要由激光发射电路与激光接收电路等保证激光通路中如有相关通道被遮断，光敏电阻就呈现很大的电压变化，通过程序控制模数转换芯片（ADC0809）不断的采集电压，就能捕获到这种变化，若电压超出阈值，就实现声音报警和GPRS报警。系统采用8255并行接口芯片实现数码管的动态扫描显示，可以利用硬件或软件方式修改各个通道的报警阈值。实际应用表明，该系统响应速度快、运行稳定、安全可靠。