针对传感器网络中人体存在的智能感知问题,文中设计了一种以ATmega16单片机为控制核心的热释电传感器感知节点,该节点能够准确地感应出半径3.5m、锥角110°范围内人体的存在,感知数据经单片机处理后传送到网络中的主机,通信接口采用无线和有线2种形式.节点采用主动和被动相结合的检测方式,组网时最多可在一个网络中接入256个节点.相对于电平和电流环传输方式的传感器,该感应节点在组网、扩展和某些布线不方便的场合更具可操作性.%For the issue of intelligent sensing the existence of human body in sensor networks, a pyroelectric sensor node was designed based on ATmegal6 MCU in the paper. The node can sense the existence of the human within a core area with the radius of 3.5 m and the core angle of 110 degree. The data from the sensors is handled by the MCU,and then transmitted to the host using the communication interface which has wireless and wire two ways. The node can be worked in two detected modes:active mode and passive mode,and more than 256 nodes can connect to the network in passive mode. Compared to traditional sensors based on level transmission and current loop, the intelligent node has incomparable advantage in network construction, network extend and cabling installation.
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