基于CAN总线和DTMF技术的家居安防系统设计

摘要

This paper introduces a kind of intelligent home security system basing on AT89S52 chips. The system was a multi -node home security system in which information transfers through DTMF and CAN bus, and it includes the functions of fireproof, theft -proof and anti -gas, can achieve automatic detection and automatic telephone dial - up alarm. ringing detection circuit, telephone onhook/offhook circuit,DTMF circuit, coding voice reminder circuit, voice ciruit, CAN bus circuit were described in detail. The practicability and flexbility of the system were validated by practical experiments. All the function were realized real - time and reliable. The system was suitable to security system or other place.%介绍了一种以AT89S52单片机为控制核心,通过DTMF公用电话网和CAN总线传递的多节点家居安防系统设计方案.本智能家居安防系统集防火、防盗、防燃气为一体,可实现自动检测与自动语音拨号报警.介绍了振铃检测、模拟摘、挂机、放音单元等功能,详细介绍了DTMF收发电路、通话电路和CAN总线传输等电路.实验结果表明,本系统功能实用,信息传递实时可靠,适用于家居安防或其他场所的安防系统.