Abstract
With the rapidly development of socio-economic and constantly improvement of people's living standard, people have more and more residential demand, reflected in not only want to have comfortable, warm shelter, but also made more High demand for security, intelligence and other performance, smart home security system came to begin with it. Now many of the community are installed intelligence alarm system, thus the community safety is greatly improved, effective inhence the residents' personal and property safety. Because infrared is not visible, have a strong hidden nature and confidentiality, so it has widely used in anti-theft, and other security warning devices .
In this text, the development survey of security keeping away technology of Smart Home in the world is debated. According to the developmental direction of the technology overseas and the situations of our countries, we have researched and designed a kind of intelligent alarm system for SmartHome. It has the function of theft-proof, performing automatic detection and automatic dial. Pyroelectric infrared sensor is used for theft-proof so as to realize automatic detection. It is designed to make the least fail to alarm and false alarm and enhance the reliability of the system. When detector has detected any abnormality signals, an interrupt request will be sent to the MCU. Next the MCU control the interface circuit of telephone to accomplish simulated off-hook, then auto-dial by dial-p circuit of DTMF, and play the phonetic information which has been recorded beforehand by phonetic circuit, to tell the user of the emergency which has occurred, so that they can take corresponding step on time.
