27-04-2011, 10:41 AM
PRESENTED BY-
ABHINAV PRIYANSHU
[attachment=12906]
MULTIPLE DEVICE CONTROL USING A SINGLE REMOTE
Origin Of Name ZigBee
The domestic honeybee, a colonial insect, use a technique 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, she is able to share information such as the location, distance, and direction of a newly discovered food source to her fellow colony members.
Similarly, ZigBee Symbolizes communication between nodes in a mesh network.
Why is ZigBee needed?
There are a verity of standards that address mid to high data rates for voice, PC LANs, video, etc. However, up till now there hasn’t been a wireless network standard that meets the unique needs of sensors and control devices.
Sensors and controls don’t need high bandwidth but they do need low latency and very low energy consumption for long battery live.
Types of Components
Two types of devices used by ZigBee system:
Full- function device (FFD).
Reduced-function device (RFD).
The network shall include at least one FFD, operating as the PAN coordinator.
RFD is intended for applications that are extremely simple and does not need to send large amount of data.
FFD can talk to RFDs or FFDs while RFD can only talk to FFD.
Network Topologies
Star Topology: the communication is established between devices and a single central controller, called the PAN coordinator.
The PAN coordinator may be main powered while the devices will most likely be battery powered
Each start network chooses a PAN identifier, which is not currently used by any other network within the radio sphere of influence. This allows each star network to operate independently.
Applications that benefit from this topology include home automation, personal computer (PC) peripherals, toys and games.
Peer-to-peer (Mesh) topology: has also one PAN coordinator. In contrast to star topology, any device can communicate with any other device as long as they are in range of one another.
It can be ad hoc, self-organizing and self-healing network.
Applications such as industrial control and monitoring, and wireless sensor networks.
Cluster-tree topology: is a special case of a peer-to-peer network in which most devices are FFDs and an RFD may connect to a cluster-tree network as a leave node at the end of a branch.
Any of the FFD can act as a coordinator and provide synchronization services to other devices and coordinators. Only one of these coordinators however is the PAN coordinator
Data Transfer
Information in a ZigBee network is transferred in packets with a maximum size of 128 bytes.
The ZigBee specification supports a maximum data transfer rate of 250 kbps for a range of up to 30 meters.
For priority messages, a guaranteed time slot mechanism has been incorporated . This allows high priority messages to be sent across the network as rapidly as possible.
ZigBee vs. Bluetooth
ZigBee looks rather like Bluetooth but is simpler, has a lower data rate ,a node on a ZigBee network should be able to run for six months to two years on just two AA batteries.
The operational range of ZigBee is 10-75m compared to 10m for Bluetooth (without a power amplifier).
When ZigBee node is powered down, it can wake up and get a packet in around 15 msec whereas a Bluetooth device would take around 3sec to wake up and respond.
ABHINAV PRIYANSHU
[attachment=12906]
MULTIPLE DEVICE CONTROL USING A SINGLE REMOTE
Origin Of Name ZigBee
The domestic honeybee, a colonial insect, use a technique 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, she is able to share information such as the location, distance, and direction of a newly discovered food source to her fellow colony members.
Similarly, ZigBee Symbolizes communication between nodes in a mesh network.
Why is ZigBee needed?
There are a verity of standards that address mid to high data rates for voice, PC LANs, video, etc. However, up till now there hasn’t been a wireless network standard that meets the unique needs of sensors and control devices.
Sensors and controls don’t need high bandwidth but they do need low latency and very low energy consumption for long battery live.
Types of Components
Two types of devices used by ZigBee system:
Full- function device (FFD).
Reduced-function device (RFD).
The network shall include at least one FFD, operating as the PAN coordinator.
RFD is intended for applications that are extremely simple and does not need to send large amount of data.
FFD can talk to RFDs or FFDs while RFD can only talk to FFD.
Network Topologies
Star Topology: the communication is established between devices and a single central controller, called the PAN coordinator.
The PAN coordinator may be main powered while the devices will most likely be battery powered
Each start network chooses a PAN identifier, which is not currently used by any other network within the radio sphere of influence. This allows each star network to operate independently.
Applications that benefit from this topology include home automation, personal computer (PC) peripherals, toys and games.
Peer-to-peer (Mesh) topology: has also one PAN coordinator. In contrast to star topology, any device can communicate with any other device as long as they are in range of one another.
It can be ad hoc, self-organizing and self-healing network.
Applications such as industrial control and monitoring, and wireless sensor networks.
Cluster-tree topology: is a special case of a peer-to-peer network in which most devices are FFDs and an RFD may connect to a cluster-tree network as a leave node at the end of a branch.
Any of the FFD can act as a coordinator and provide synchronization services to other devices and coordinators. Only one of these coordinators however is the PAN coordinator
Data Transfer
Information in a ZigBee network is transferred in packets with a maximum size of 128 bytes.
The ZigBee specification supports a maximum data transfer rate of 250 kbps for a range of up to 30 meters.
For priority messages, a guaranteed time slot mechanism has been incorporated . This allows high priority messages to be sent across the network as rapidly as possible.
ZigBee vs. Bluetooth
ZigBee looks rather like Bluetooth but is simpler, has a lower data rate ,a node on a ZigBee network should be able to run for six months to two years on just two AA batteries.
The operational range of ZigBee is 10-75m compared to 10m for Bluetooth (without a power amplifier).
When ZigBee node is powered down, it can wake up and get a packet in around 15 msec whereas a Bluetooth device would take around 3sec to wake up and respond.
