| Home security alarm system is an important part of the smart home system. The disadvantages of traditional security doors and windows are easily pried without alarm. For the reason, a home security system, which based on ZigBee technology, GSM technology and multi-sensor technology, had been designed. And then the environment safety would be greatly improved with some accurate parameters obtained by the collection and analysis of intrusion information.In the dissertation, ZigBee technology had been systematically studied and analyzed. ZigBee network topology was simply introduced, and the process of forming and adding to the network were analyzed through the study of the structure and principles of the protocol stack. A small-scale star network had been designed for the requirements of system based on the protocol.With the LPC2148ARM processor as the core, CC2430as the core of RF module system, combining with the vibration sensor, pyroelectric sensor and photoelectric sensor, and TC35module as the message transmission platform, the system hardware resources had been designed, and the hardware of the sensor module, terminal device node, coordinator node and the main controller had also been designed. Then, the whole circuits were completed with the hardware platform, the program compiled through the software design, and the function of the system had been verified through the experiments.Through the research and analysis of original CSMA/CA backoff algorithm in ZigBee protocol, for a little of shortcoming, an improved slot CSMA/CA backoff algorithm had been proposed. The experiment had been built by using the hardware platform. The experiment results showed the certain advantage of system originated from the system transmission delay parameters. |
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