Abstract
    Bluetooth is a short-range wireless connectivity technology is an important part of the future home network system. Based on the analysis of Bluetooth technology, explore the Bluetooth technology in the home network system. Bluetooth technology in the home network, with high reliability, low complexity, low power, low cost advantages, but there are still some problems to be solved, such as between adjacent devices to prevent misinformation and is intercepted, must To the user set in advance corresponding band; higher prices Bluetooth chip; Bluetooth module difficult production. It is believed that with the advent of Bluetooth network appliances and network equipment, home networks can further spread of these problems will gradually be resolved, and Bluetooth home network system will also give future family life a huge revolution. For this reason, the design of a passive infrared detection technology based on the use of pyroelectric infrared sensor burglar alarm constitute information gathering unit to the alarm system AT89S51 microcontroller as the core control unit, this circuit is the hidden and SCM infrared Small, powerful, low price well used in the alarm system, thus ensuring the system is simple, low cost and reliability, while at the same time to achieve a good anti-theft alarm function, to the security purposes.