通过Cc2420 构建多级的无线传感器网络，共有三个sink 和sensor-By Cc2420 build multi-level wireless sensor network, there are three sink and sensor

zigbee网络通信程序，实现了两个节点（sink & sensor）点对点的通信。-The zigbee network communication program to achieve the two nodes (sink & sensor) point-to-point communications.

在无线传感器网络中，简单的轮询传输协议，节点逐个将数据传输给sink，直接可以用，无线传感器网络基础程序，利于入门。-In wireless sensor networks, a simple polling transfer protocol, node-by-transfer data to sink, can be used directly, wireless sensor network infrastructure program, which will help to get st