Bluetooth Home Gateway And It's Application And Study In Smart Home System

The study on smart home system is an important aspect and hot spot of intelligent building, which is in the beginning stage at home and abroad, so the international standard is still in immaturity for this filed. With the popularization of network technique and the development of embed Internet, the smart home has been turned from the system of PC-centered control to embed system of intelligent home gateway. So it is the key to realize the smart home system that how to design a high performance home gateway.A new improved project of home gateway is presented in this paper with the author's practice of gateway item in the Institute of Chongqing Bluetooth wireless technique as base. With the regard to hardware, the home gateway embeds the Ethernet controller to connect to Ethernet directly so that transmission rate can be promoted than that of PPP dial-up; with embedded blue-tooth module the wireless network in home can be assembled in an easy way. With this means the cable in home can be replaced and orientation for transmitting is spared and the valid transmission rate reaches 712Kbps. In the aspect of software, a set of simplified TCP/IP protocol stack is designed for the purpose of network communication. At the top application layer HTTP and FTP is applied in the gateway to realize a web server. An EEPROM is added in the circuit to save the message of device-associated web pages in home. Users can get access to gateway server to browse or change web pages at any place through browser of remote terminal in conjunction of CGI. Another control mode is the local control mode, i.e. the PC in home receives the message from gateway and saves that into database, then the JSP web server on PC acquires the household appliance's message by accessing the database through JDBC-ODBC bridge to response the request of browser on remote terminal.The gateway hardware and the key software (access through I2C bus,the realization of TCP/IP protocol stack and web server, the drivers of Ethernet controller and blue tooth module) is presented in this paper. A study and analysis on the smart home system based on this gateway is presented also. At last, the main center-controlling program and server script program are written in VB and JSP for the center-controlling and remote-controlling emulation of smart home system.