This paper describes and implements a new type of coal mine safety monitoring system, it is a kind of wireless sensor network system based on ZigBee technology. The system consists of two parts underground and surface. Wireless sensor networks are constituted by fixed nodes, mobile nodes and a gateway in underground. PC monitoring software is deployed in the surface. The system can not only gather real-time environmental data for mine, but also calculate the real-time location of mobile nodes worn by miners.
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