Abstract:

To solve the problems of monitoring system under coal mine, which include the rational use of network resources, reduce energy consumption and improve transmission rate because of using a single network protocol, based on the mixed protocol zigbee and wifi, a new wireless sensor network monitoring system is designed in this paper. The non-video information uses zigbee protocol, via clustering type chain type wireless network to the ground monitoring center, while audio and video data information uses wifi protocol to the ground monitoring center. A combination of the two can reduce the high-cost and high-power problems which using the single wifi protocol brings and also solve the worse real-time issue when using the single zigbee protocol to the maximun. The actual application shows that the mixed protocol wireless monitoring system in this paper greatly improves the reliability and security of the system.

Key words: zigbee and wifi protocol, underground, wireless sensor network, monitoring system