The Designof ZigBee Open-source Collectionnode Based On Contiki

Decause of the characteristics of low-cost, low-power, short-range, low-rate, ZigBee wireless sensor networkshas been widely used in military, intelligent transportation, environmental monitoring, health care and so on.But major chip manufacturers such as TI, EMBER and FREESCALintroduceZigBee protocol stackin the form of non-open source library,and add their own proprietary protocol on the MAC layer to bindings produced chips. Because of non-open source protocol,development of ZigBee protocol stack is increased the difficulty,ZigBee nodes based on different manufacturers' chipswhich is added proprietary protocolon MAC layer are incompatible, and can not communicate properly.ZigBee protocol stack for non-open-source problem, set a open-source ZigBee protocol stack, on the basis of this open source stack to resolve the incompatibility issues between nodes,In this paper, in-depth study of the ZigBee protocol standard, on ZigBee protocol stack analysis of the structural features and the development of domestic,designed and completed the node of ZigBee open sourceacquisitionbased on embedded control.Collection node is in the control center of STM32, based on ZigBee open-source protocol,complete the circuit design of open source ZigBee node,There are RTC design, JTAG emulation interface circuit design, CC2530 RF chip communication circuit and interface circuit design, sensor I/O interface circuit design.Contiki system is ported to the STM32 platform and CC2530, by hierarchical design ideas, a set of open-source ZigBee protocol stack is established on a Contiki system based on CC2530 platform.The CC2530 RF chip which is controledby STM32 control center were to receive and send data, designed to complete the acquisition node based on open source ZigBee protocol stack, design completed the acquisition node based on open source ZigBee protocol stack.ZigBee open-source collection nodes chieve open-source stack and compatible between different chip nodes,by test of ZigBee open-source acquisition node,it indicates that the node hardware circuit performance can work,detection ofRSSI value provenode can communicate at close range from 2 to 12 m, when the nodes is closer spacing packet loss rate can be controlled at less than 2.75%, through ZigBee open source network nodes can communicate properly.