smart dust final11

7/31/2019 Smart Dust Final11

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INTRODUCTION

WORKING and OPERATION.APPLICATIONS.

ADVANTAGES.

DISADVANTAGES.


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Smart dust devices are tiny wireless micro-electro-mechanical sensors (MEMS) that

can detect everything from light tovibrations

.


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Smart dust as small as a grain of rice is able tosense, think, talk and listen.

These are helping wireless systems to become

cheap and as small as dust particles and hence,it is going to become much easier to lay outsensor networks for a large variety of reasons.

Smart dust is tiny electronic devicesdesigned to capture mountains ofinformation about their surroundings whileliterally floating on air.


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The devices are called MOTES, are intended

to be the size of a grain of sand, or even a dustparticle.

They each would contain sensors, computing

circuits, bidirectional wireless communicationstechnology and a power supply.

Motes would gather data, run computationsand communicate that information using two-way band radio between motes at distancesapproaching 1,000 feet.


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The signals are sent at radio frequencies.

It applies free space optical transmissionof signals.

The optical are emitted by the MOTESusing Active and

Passive transmitters.

They are received by BTS(Base StationTrans-receiver).

The signals from BTS are received by thePhoto detector and sensors on the Motes.


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The energy stored by it is about 1J per dayand is stored in thick film battery.

When line-of-sight path is available,passive transmitters are used.

The non-line-of-sight transmission is doneby the active transmitters using beamsteering.

The BTS has image receiver that decodesthe information.

BTS contacts with several motes present

in its receiver field.


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SOME OF THE DEVICES


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Environmental monitoring (temperature,wind, pollution, changes in climate).

Providing more security in vehicular traffic.

National security measures (monitoringand guarding borders).

Agricultural monitoring (monitoring grow

conditions).

Mobile Networking.

Water consumption monitoring.


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Small in size, Less power consumption(microwatts level), Less maintenance.

No complex circuitry required as it does

need any modulating devices & filters.

The Active transmitters reflect the signalsat kilohertz range enabling high frequency

transmission. These small motes can be used to

establish a denser network to monitor any

system at more than a kilometer range.


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An unbroken line of sight is required for thetransmission using Passive transmitters.

The transmitting and receiving fields of thedust motes should match with that of theBTS.

Power supply needs to be revised as solarcells sometimes may not be effectivelyworking.

Denser mote network has to be


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smart dust final11

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