Published on September 30, 2010
WIRELESS COMMUNICATIONWIRELESS SENSORS : WIRELESS COMMUNICATIONWIRELESS SENSORS BY, M.Saravana Kumar CONTENTS : CONTENTS INTRODUCTION WIRELESS SENSOR- ZIGBEE USES PROTOCOLS SOFTWARE AND HARDWARE DEVICE TYPES WIRELESS FORMATS CONCLUSION INTRODUCTION : INTRODUCTION The upcoming technology and machinery are implemented in various fields . These technology and mechinary are vital to use and needs great safety and security. This problem can be sloved by the help of wireless sensors. This sensors monitor the problem and alarms or takes necessary actions for that. WIRELESS SENSOR- ZIGBEE : WIRELESS SENSOR- ZIGBEE ZigBee operates in the industrial, scientific and medica (ISM)radiobands;868MHz in Europe, 915 MHz in the USA and 2.4 GHz inmosturisdictionsworldwide. The most capable ZigBee node type is said to require only about 10% of the software of a typical Bluetooth or Wireless Internet node,while the simplest nodes are about 2%. USES : USES ZigBee protocols are intended for use in embedded applications requiring low data rates and low power consumption. ZigBee's current focus is to define a general-purpose, inexpensive, self-organizing, mesh network. It can be used for industrial control, embedded sensing, medical data collection, smoke and intruder warning, building automation, home automation, domotics, etc. PROTOCOLS : PROTOCOLS In most large network instances, the network will be a cluster of clusters. It can also form a mesh or a single cluster. The current profiles derived from the ZigBee protocols support beacon and non-beacon enabled networks. In general, the ZigBee protocols minimize the time the radio is on so as to reduce power use. SOFTWARE AND HARDWARE : SOFTWARE AND HARDWARE The software is designed to be easy to develop on small, cheap microprocessors. The radio design used by ZigBee has been carefully optimized for low cost in large scale production. It has few analog stages and uses digital circuits wherever possible. ZigBee Home Automation Example : ZigBee Home Automation Example DEVICE TYPES : DEVICE TYPES There are three different types of ZigBee device: ZigBee coordinator(ZC) ZigBee Router (ZR) ZigBee End Device (ZED) ARCTITECTURE : ARCTITECTURE COMMERCIAL BUILDING AUTOMATION : COMMERCIAL BUILDING AUTOMATION Measuring temperature and humidity; controlling heating, ventilation, air-conditioning units, shades blinds and lighting; Controlling access and providing security etc. POINT-TO-POINT LINKS : POINT-TO-POINT LINKS Sometimes referred to as a "wireless bridge," a point-to-point link serves as a replacement for a single communication cable. WIRELESS MESH NETWORKS : WIRELESS MESH NETWORKS Wireless Mesh Networks : Wireless Mesh Networks Like the Internet and other router-based communication networks, a mesh network offers multiple redundant communication paths throughout the network. If a single node fails for any reason messages will automatically be routed through alternate paths. In a ZigBee mesh network, the distance between wireless nodes can be shortened, which dramatically increases the link quality between nodes. CONCLUSION : CONCLUSION The wireless Zigbee is most powerful due to elimination of cables and fast reporting . It is efficient due to low cost, high frequency range and simple architectural process . The implementation from the software side and hardware needs minimum cost with which it is easy to develop small, cheap microprocessors for sensing.