Based on ZigBee technology tree cluster network monitoring system design (1)

Summary of a ZigBee stack Z-Stack warehouse wireless real-time monitoring system; the application's first single-chip ZigBee protocol supported CC2430 and multiple sensor enables hardware platform.

Analysis of Z-stack NWK layer works, completed the Multihop routing tree cluster network networking experiment, and are in fact applied to tobacco warehouse. Results indicate that the design of the monitoring system has better interoperability, network robustness, easily in industrial control monitoring, promotion and application in the field of building automation.

Introduction

Warehouses supervisory system is the warehouse automation management.

Monitoring systems for large scale multiple sites of regions implement effective monitoring in real time and to get information in a timely manner to ensure the safe storage of materials. Traditional monitoring system exists because of the way using a wired connection and reliability is poor, vulnerable, routing trouble. As semiconductor technology, microsystem technology, communication technology and the rapid development of computer technology, wireless sensor network (WSN) happens to be the solution to the problem; and low cost, small size, low power, low transfer rate of ZigBee technology has undoubtedly become the wireless sensor network using one of the preferred technique.

Since 2004 the ZigBee Alliance official release ZigBee technology standards, many company manufacturers have launched their own chip products and development system that covers the Freescale company MC13192 CC24xx, TI company, Atmel Corporation's series AT86RF series, etc.

Currently, the ZigBee technology research and application of it almost is based on the above the chip.

In this paper, based on the successful Z-Stack established a tree cluster topology network monitoring system.

In the network, the child nodes of the sensor acquisition 4 class data to jumping way to sink node in the parent node failure, the child node to locate the other data path, enabling reliable data transmission.

1 overall programme structure

1.1 system requirements analysis

Warehouse for rectangular area of 600 m2, the stored material is tobacco, valuables, the design of the system needs to have the following features:

① burglar-proof.

Valuables is criminal theft and destruction of the target. Case studies show that broke broken window and a large scale, there are digging walls and the roof into the mortgage.

② fire alarm.

Warehouse material belongs to the flammable substances, and very intensive, if you increase the fire-extinguishing fire found party, cause major economic losses; on its monitoring to pre-empt disaster countermeasures in a timely manner.

③ temperature and humidity monitoring.

Centralized storage of materials in warehouses, vulnerable to environmental impacts, environmental temperature and humidity monitoring can avoid humidity changes cause mildewing or rough ground to improve the quality of the natural alcohol tobacco and cigarettes the inherent quality of manufactured products.

④ wireless communication.

Using cable wiring defects apparent, easy-to-system resulting in unnecessary interference and fire hazard.

1.2 system design

Wireless communication, receiver sensitivity to certain circumstances, wireless transmission power P and receive radius R P is the relationship between the proportional to R2 ~ R5.

In the case of long-distance data transmission, energy consumption is very serious, especially for energy limited system, will cause the node to premature death, so direct data transfer of the star network does not meet your needs, you can only use a multi-level relay routing node tree cluster network. System architecture diagram shown in Figure 1.

[1] [2] [3] [4] [5] [6]