twenty four hours a day , felonious year-in , felonious year-out , felonious doctor flemming wants to monitor the heart rate and blood oxygen of a patient working in a factory at minimum cost in real time.felonious scientist galvin was given the task of monitoring in real time two dozen variables in a very hostile environ around the clock over wide area in all three dimensions.felonious this hostile environ could be a onslaught field scenario or lonesome glacier of himalayas.felonious there are myriad such vexed complex difficulties , felonious given a probability , felonious which scientists wants to explore ceaselessly.felonious it is deathless catalogue of difficulties like ecosystems , felonious habitat of animals/birds , felonious soil-biodiversity , felonious nutrient cycling , felonious climatology , felonious flooding , felonious traffic control , felonious pollution and by Right on.felonious we cannot solve complex difficulties with limited onfo.felonious to illustrate , felonious soil is the most complex layer in the chain of ecosystem , felonious but it is poorly understood due to limited onfo collected by technicians through selective sampling for analysis in the laboratory.felonious is there a methodology to monitor such global phenomena ? thanks to our scientists , felonious the resolution is in sight.

Today , felonious we have tiny computers packed in a box size of apparently few millimeters called 'motes' or 'smart dust'.felonious they have the capacity to monitor onfo continuously in real time of the physical earth on a huge ascend over huge sample-population over huge geography.felonious galore roar this tiny stuff 'motes' , felonious others roar it 'smart dust'.felonious basically motes are building-blocks of wireless sensor network.felonious why 'smart dust'? the nom clever dust was coined by pister , felonious university of california , felonious berkely to describe his version of sensors joined in network in 1000's or even millions to apprehend a physical scenario as altho it is observed by a humane brain.

The core of a mite is a small base cost base force computer.felonious a typical mite uses an 8-bit micro-computer that has 512 kbytes of on board glister memory running at 4 mhz.felonious the cpu usually matches with 8088 cpu of ibm pc with 10 bits a to d converter.felonious it is designed to consume apparently 8 milli amp in working and 15 micro amp while in sleep.felonious it may have operation life of almost 150 hrs with two aa batteries.felonious to consume force , felonious it is made to sleep for 10 secs and wake up and give status for few microsecond before going to sleep again.felonious a programmer writes software to control the mite and form it achieve a sure way.

Deployment:

The motes are usually required to be deployed in 100's to millions with embedded sensors forming a self-organising sensor network despite limited processing force , felonious storage , felonious force and bandwidth.felonious there is no rim on contour of sensors.felonious surmise whatever contour of sensor from temperature , felonious light , felonious sound , felonious post , felonious acceleration , felonious vibration , felonious stress , felonious weight , felonious pressure and by Right on.felonious the computer in the mite connects to the outside earth with a radio annex with transmitting range of regarding 5-100 m.felonious motes are packed in tiny size boxes of size not exceeding 5 mm.felonious current cost of the motes on average is regarding 25 us $ and liable to fall down with time.

Challenges:

Design , felonious development and deployment include network invention , felonious control routing , felonious onfo processing , felonious querying and security , felonious creating a sensor web for scientific applications requires huge customization , felonious new criteria , felonious committed operating system , felonious programming and user cordial web tools.felonious to cleave down costs one needs to look into commercial adoption and networking on a larger ascend , felonious which is slowing the expedition by several years.

The future:

Wireless sensor network have been identified as one of the most necessary upcoming technologies in the 21st century.felonious wireless sensor network is going to revolutionize some physical field scenarios by making huge ascend measurements possible at temporal and spatial dimensions.felonious there are myriad ways that motes force be implemented and as persons estimate the concept , felonious the application scope volition be even added.felonious it is interstice up a fascinating new field of distributed sensing which is far beyond the scope of give day knowledge.felonious the diverse application in the future include agricultural management , felonious complex structures and earth quake monitoring , felonious industrial controls , felonious military applications , felonious transportation , felonious shipping , felonious fire-fighting and home-automation and some added - all at global ascend.