关键词: Ad Hoc网络, Liod开发板, Ad Hoc按需距离向量, 通用输入输出

Abstract: Based on Ad Hoc networks，a solution of the system is proposed that can detect information of dangerous system and help people to make decision.The system adopts a layered-manner and has three layers：detecting ball layer，terminal layer and commanding center layer.Detecting ball layer contains modules of video，audio and air quality detecting.Terminal layer is based on Liod development board and Linux system.This layer has functionality of collecting video and audio signal，detecting air condition and alarming.A terminal can communicate with other terminals and commanding center with ad hoc networks.Then commanding center plays a role of scheduling.With such a system，operations which include realtime commanding，picture transfer，realtime audio transmission，people locating and area map drawing can be conducted in dangerous area.

Key words: Ad Hoc, Liod, Ad Hoc On-demand Distance Vector（AODV）, General Purpose Input/Output（GPIO）