30-07-2012, 12:58 PM
ZEITGEIST '09': NATIONAL LEVEL STUDENT TECHNICAL SYMPOSIUM
[attachment=29499]
ABSTRACT
ZigBee is a low-power wireless technology, rewriting the wireless sensor equation. It is a secure network technology that rides on top of the recently ratified IEEE 802.15.4 radio standard.
It is designed to interact with the remote controlled devices, which are put under a single standardized control interface that can interconnect into a network .Once associated with a network, a ZigBee node can wake up and communicate with other ZigBee devices and return to sleep.
INTRODUCTION
Zigbee’s key technical features include three license free frequency bands-2.4GHz, 868MHz, 915MHz ;multiple channels ;up to 100mts range; CSMA-CA channel access; low power, long battery life; supporting up to 255devices per network.
Zigbee is used in home security systems where wireless sensors are easily installed than sensors that need wiring. The same is true in industrial environments, where wiring typically accounts for 80% of the cost of sensor installations. And then there are applications for sensors where wiring isn't practical or even possible. ZigBee promises to put wireless sensors in everything from factory automation systems to home security systems to consumer electronics.
ORIGIN OF THE NAME ZIGBEE
The network name comes from the zigzagging path a bee (a data packet) takes to get from flower to flower (or node to node). The technique that honey bees use to communicate new-found food sources to other members of the colony is referred to as the ZigBee Principle. Using this silent, but powerful communication system, whereby the bee dances in a zigzag pattern, they are able to share information such as the location, distance, and direction of a newly discovered food source to her fellow colony members.
CHARACTERISTICS
• Low cost — Extends wireless to virtually any sensor
• Low power consumption — Ideal for battery operation
• Small size, light weight — Easy to integrate
• Ease of implementation
• Reliable data transfer
• Appropriate levels of security
• Direct sequence spread spectrum — Fast acquisition time
• Range- 50m typical (5-500m based on environment)
• Multiple topologies- star, peer-to-peer, mesh
• Data rates of 250 kbps (@2.4 GHz), 40 kbps (@ 915 MHz), and 20 kbps (@868 MHz)
ARCHITECHTURE
ZigBee stack architecture follows the standard Open Systems Interconnection (OSI) reference model, ZigBee's protocol stack is structured in layers. The first two layers, physical (PHY) and media access (MAC), are defined by the IEEE 802.15.4 standard. The layers above them are defined by the ZigBee Alliance.
[attachment=29499]
ABSTRACT
ZigBee is a low-power wireless technology, rewriting the wireless sensor equation. It is a secure network technology that rides on top of the recently ratified IEEE 802.15.4 radio standard.
It is designed to interact with the remote controlled devices, which are put under a single standardized control interface that can interconnect into a network .Once associated with a network, a ZigBee node can wake up and communicate with other ZigBee devices and return to sleep.
INTRODUCTION
Zigbee’s key technical features include three license free frequency bands-2.4GHz, 868MHz, 915MHz ;multiple channels ;up to 100mts range; CSMA-CA channel access; low power, long battery life; supporting up to 255devices per network.
Zigbee is used in home security systems where wireless sensors are easily installed than sensors that need wiring. The same is true in industrial environments, where wiring typically accounts for 80% of the cost of sensor installations. And then there are applications for sensors where wiring isn't practical or even possible. ZigBee promises to put wireless sensors in everything from factory automation systems to home security systems to consumer electronics.
ORIGIN OF THE NAME ZIGBEE
The network name comes from the zigzagging path a bee (a data packet) takes to get from flower to flower (or node to node). The technique that honey bees use to communicate new-found food sources to other members of the colony is referred to as the ZigBee Principle. Using this silent, but powerful communication system, whereby the bee dances in a zigzag pattern, they are able to share information such as the location, distance, and direction of a newly discovered food source to her fellow colony members.
CHARACTERISTICS
• Low cost — Extends wireless to virtually any sensor
• Low power consumption — Ideal for battery operation
• Small size, light weight — Easy to integrate
• Ease of implementation
• Reliable data transfer
• Appropriate levels of security
• Direct sequence spread spectrum — Fast acquisition time
• Range- 50m typical (5-500m based on environment)
• Multiple topologies- star, peer-to-peer, mesh
• Data rates of 250 kbps (@2.4 GHz), 40 kbps (@ 915 MHz), and 20 kbps (@868 MHz)
ARCHITECHTURE
ZigBee stack architecture follows the standard Open Systems Interconnection (OSI) reference model, ZigBee's protocol stack is structured in layers. The first two layers, physical (PHY) and media access (MAC), are defined by the IEEE 802.15.4 standard. The layers above them are defined by the ZigBee Alliance.