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Bluetooth based smart sensor networks

PostPosted: Mon Jan 16, 2012 7:57 am
by swetha joshi
Bluetooth based smart sensor networks

Re: Bluetooth based smart sensor networks

PostPosted: Mon Jan 16, 2012 5:51 pm
by Prasanth
Blue tooth operates in the unlicensed ISM band at 2.4 GHZ frequency band and use frequency hopping spread spectrum technique. A typical Blue tooth device has a range of about 10 meters and can be extended to 100meters. Communication channels supports total bandwidth of 1 Mb / sec. A single connection supports a maximum asymmetric data transfer rate of 721 KBPS maximum of three channels.

BLUE TOOTH – NETWORKS

In bluetooth, a Piconet is a collection of up to 8 devices that frequency hop together. Each Piconet has one master usually a device that initiated establishment of the Piconet, and up to 7 slave devices. Master’s Blue tooth address is used for definition of the frequency hopping sequence. Slave devices use the master’s clock to synchronize their clocks to be able to hop simultaneously.

When a device wants to establish a Piconet it has to perform inquiry to discover other Blue tooth devices in the range. Inquiry procedure is defined in such a way to ensure that two devices will after some time, visit the same frequency same time when that happens, required information is exchanged and devices can use paging procedure to establish connection.

When more than 7 devices needs to communicate, there are two options. The first one is to put one or more devices into the park state. Blue tooth defines three low power modes sniff, hold and park. When a device is in the park mode then it disassociates from and Piconet, but still maintains timing synchronization with it. The master of the Piconet periodically broadcasts beacons (Warning) to invite the slave to rejoin the Piconet or to allow the slave to request to rejoin. The slave can rejoin the Piconet only if there are less than seven slaves already in the Piconet. If not so, the master has to ‘park’ one of the active slaves first. All these actions cause delay and for some applications it can be unacceptable for eg: process control applications, that requires immediate response from the command centre (central control room).

Re: Bluetooth based smart sensor networks

PostPosted: Sun Jan 22, 2012 3:58 pm
by khaja
i need full documentation and ppt for this topic...

Re: Bluetooth based smart sensor networks

PostPosted: Fri Jan 27, 2012 10:58 am
by neha balyan
neha wrote:i need full ppt for this topic.. plz sir.

Re: Bluetooth based smart sensor networks

PostPosted: Mon Jan 30, 2012 11:19 am
by neha balyan
neha balyan wrote:
neha wrote:i need full ppt for this topic.. plz sir.

Re: Bluetooth based smart sensor networks

PostPosted: Fri Feb 14, 2014 9:21 am
by Anu23
plz send me ppt slides on Bluetooth based smart sensor networks...
my id is kumari.anupama46@gmail.com

Re: Bluetooth based smart sensor networks

PostPosted: Sat Jul 05, 2014 4:35 pm
by sanjanasmenon
i need a ppt related to this topic....plzz help me

Re: Bluetooth based smart sensor networks

PostPosted: Sat Sep 20, 2014 8:20 am
by Satishdoud
I need full ppt plz