People's pursuit of quality of life is getting higher and higher, and they are more eager for a safe, smart and healthy home environment. The traditional smart home security system has a single function, low efficiency, high false positive rate, high maintenance cost, and can not be well integrated with the rapidly developing Internet technology. It has been difficult to meet the requirements of the market and the public for home security systems. The development of modern wireless sensor network technology (WSN) and Internet of Things technology makes the networked smart home security system have the characteristics of security, intelligence, convenience and environmental protection, while ensuring the system's real-time performance, high reliability, low false alarm rate, Low power consumption and low cost maintenance. To this end, this paper proposes WSN and smart phone Android platform based on features such as low power consumption, self-organizing network, low-rate, low-cost and two-way communication characteristics. It can use the home gateway to construct video data collection, transmission and network background storage. The smart home security system, while the system can use the Internet network for remote monitoring.
1, system design
The WSN part of the system adopts the ZigBee protocol, which consists of multiple terminal nodes and a coordinator. Each terminal node can self-organize the network, and the data is finally aggregated to the coordinator node, and then accesses the Internet through the home gateway. The user can remotely monitor the smart home through the Internet on the PC, the set-top box, and the mobile client. The sensor information in the home is collected by the GPIO port on the terminal node and sent to the coordinator via the WSN network. The coordinator completes the data communication with the home gateway through the USB-TTL module, and the home gateway reports the data to the server. In order to reduce the false alarm rate of the security system and ensure its high reliability, the sensor responsible for collecting the concentration of combustible gas in the wireless sensor network deliberately selects the high-sensitivity combustible gas sensor, and combines the anti-false alarm algorithm integrated in the terminal node protocol stack. To ensure the accuracy and reliability of the information.
The communication between the WSN network coordinator and the home gateway needs to be completed under the conversion of the USB-TTL module. The USB-TTL module driver development is based on the Linux system. In order to realize the intelligentization of the smart home security system, the device of the module is designed according to the redundant design requirements. The descriptor will recognize the USB interface changes and read and write to the device descriptors that may be transformed. The overall design of the system is shown in Figure 1.
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