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Smart home system using communication, embedded, sensors and other technology makes home networking equipment, not only within the family network, the access control device intelligence, but also the family to achieve internal and external network information exchange to improve the comfort of people's lives , security and convenience. This paper compares the wireless communication technology, combined with smart home features, determine the selection of ZigBee as the family network communication technologies. Build a smart home system overall architecture, using the internal network as a family tree network topology, and compared to the conventional star network to solve the network coverage of small and transmission flexibility. Hardware design for the home gateway, including ZigBee communication circuit, GPRS circuits and Ethernet circuits. Software level, the use of the existing hardware platform S3C2440 and embedded Linux to build a gateway platform, and add the embedded Web server. With previous PC home gateway, embedded gateway in size, power, cost, etc. has obvious advantages. ZigBee master node on the network node handling mechanism design and timeout retransmission mechanism, enhance the reliability of data transmission. In the specific application of the smart home after the analysis to design innovative user agreement, and the introduction of the heartbeat mechanism to improve data transmission in a wireless network security and reliability. Home gateway GPRS functionality to solve the user not have timely access family emergency issues, Web servers so that the user can use the browser out within the family through the network remote monitoring. Secondly, various types of sensor node hardware design, PCB diagram drawn part. Sensor nodes using the MC13224 as the main controller, its performance is better than CC2430 wireless transceiver chip, etc., to improve the stability and reliability of the wireless network. Introduction of innovative mechanisms of sleep, for all types of different applications of sensor nodes, design appropriate sleep wake cycle, and select chip low-power sleep mode, a larger extent, reduce the node power consumption. Through the sensor node hardware and software design, implementation, sensor nodes within the various environmental indicators on the home and emergency event detection. Finally, a series of experimental studies hardware platforms, including the node network configuration, network creation and network nodes, the sensor node data acquisition, communication distance measurement and remote monitoring. Experimental data show that, compared to the previous star network, this paper uses a tree network with a network covering a wide range of transport flexibility advantages, more suitable for smart home systems. Intelligent remote monitoring feature enables network communication inside and outside the home, remote operation for the user to provide a convenient, safe for the home to provide a guarantee.
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